Journal articles: 'Welding generator'

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Ji, Ling. "Control System Design Based on MSP430 Microcontroller." Advanced Materials Research 1030-1032 (September 2014): 1438–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1438.

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Single-chip microcomputer MSP430F44 is the core control chip of the multifunction TIG welding controller, MCU is produced by TI and 16-bit flash type, the chip control system uses C430 language to modular software programming, coordination with other subroutines by the main program module , through a simple interface conditioning circuitry on a TIG welder can achieve a variety of welding processes, the welding flexible demand is satisfied. One of the most important module of the welding current waveform generator module, the welding waveform parameters are automatically generated by two way, one is the welding methods, the other is the welding parameters, then judge the input signal of the welding gun, when the gun is pressed, the corresponding waveform output; the welding current waveform output can be achieved using this software, is displayed on the welding current waveform generator.

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Kardyś, W., A. Milewski, P. Kogut, and P. Kluk. "Universal Ultrasonic Generator for Welding." Acta Physica Polonica A 124, no. 3 (September 2013): 456–58. http://dx.doi.org/10.12693/aphyspola.124.456.

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Kardyś, W., and A. Milewski. "Efficiency Measurements of Ultrasonic Generator for Welding." Acta Physica Polonica A 128, no. 2 (September 2015): 456–61. http://dx.doi.org/10.12693/aphyspola.128.456.

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Dzendubaev, A.-Z. R. "Asynchronous welding generator with condenser self-excitation." Welding International 19, no. 1 (January 2005): 73–74. http://dx.doi.org/10.1533/wint.2005.3415.

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Marin, Robert Cristian, Iulian Ştefan, Răzvan Ionuţ Iacobici, and Sorin Vasile Savu. "Preliminary Research for Development of MW-TIG Hybrid Welding System." Advanced Materials Research 1164 (June 23, 2021): 9–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1164.9.

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The paper aims to report preliminary researches towards to development of new hybrid welding system by coupling a microwave beam with a TIG torch. The main research was focused on the designing of hybrid system as well as to establish the heating/welding mechanism by coupling two different thermal sources. Therefore, a specific welding chamber was designed taking into consideration the limitations provided by microwave waveguide technical specs, geometrical shape and dimensions of the TIG torch as well as the temperature monitoring during welding process and video surveillance for data recording. A microwave generator with adjustable power from 0 to 1250 W was coupled with a TIG torch and welding power source in order to establish the main parameters for hybrid system. The preliminary researches reported that the MW-TIG hybrid welding could be applied to eutectic joining of materials using low power (up to 600 W) injected from microwave generator as well as low welding current (up to 20 A). The flow of shielding gas have been established initially to 2 l/m. The research related to stabilization of MW-WIG plasma arc have been studied by increasing the flow of shielding gas up to 10 l/m. The results have shown that the microwave generator and TIG torch can be coupled to obtain hybrid-welding process without any matching tuning devices but with risks for damaging the microwave generator. Further researches will be done in order to design auxiliary devices to optimize the hybrid-welding process and to avoid any unwanted plasma arc discharge from welded base materials to microwave generator. In terms of temperature monitoring, an infrared pyrometer has been used. The IR pyrometer was targeted to the base materials in order to be able to measure their temperature without any influences from plasma arc. The results obtained have shown a stable plasma at average microwave power around 400 W even without any TIG current.

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Kravcova, E. G., Yu F. Kaizer, V. S. Tynchenko, S. Ch Mongush, S. N. Katargin, and P. Yu Vaitekunaite. "Device for connecting elements of main oil and gas pipelines using electron beam welding." Journal of Physics: Conference Series 2094, no. 4 (November 1, 2021): 042014. http://dx.doi.org/10.1088/1742-6596/2094/4/042014.

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Abstract The article deals with the problem of connecting pipelines in the oil and gas industry. To improve the quality of welds on the oil pipeline, the article proposes an alternative method of welding and venting the beam into the atmosphere. This method includes a mobile installation for electron beam welding, in which, in manual mode, it is possible to adjust the seam speed, penetration depth, change the trajectory of the weld and the position of the installation relative to the pipe axis. Guns with a plasma cathode, which allow welding products in the atmosphere, are considered. The power of the generators is also calculated, and the generators are selected corresponding to the put forward requirements. In the course of the work, the authors are designing an electron beam welding unit, which in the future is planned to be developed as a mobile one. The mobile installation includes: a generator directing the belt to the pipe, a horizontal displacement motor, a welding positioner, an electron gun with a plasma cathode.

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Sharonov, N. I., and M. G. Sharapov. "Modernization of digital beam welding scanning." Voprosy Materialovedeniya, no. 2(94) (January 10, 2019): 161–66. http://dx.doi.org/10.22349/1994-6716-2018-94-2-161-166.

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Instead of outdated GUR-1, scanning electron beam control generator, a modernized system is proposed using digital beam control along special semi-elliptical welding trajectory. The new system has successfully passed approbation when welding aluminum on an ELU-20.

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Gandy, D., G. Frederick, and K. Coleman. "Repair welding technologies for heat recovery steam generator tubing." Energy Materials 1, no. 2 (June 2006): 127–35. http://dx.doi.org/10.1179/174892306x99714.

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Shen, Yu Long, Ji Pu Liu, Yi Xin Shi, Bo Dai, Liang Su, and Wen Bo Ma. "Study on the Residual Stress Test of Welded Joints for Wind-Driven Generator Base and Numerical Analysis." Applied Mechanics and Materials 127 (October 2011): 549–54. http://dx.doi.org/10.4028/www.scientific.net/amm.127.549.

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In order to know the concrete distribution of welding residual stresses in Megawatt wind turbine’s basis, Msc.Marc codes by finite element method were applied to simulate temperature and stress field of the base’s welded joints which were appeared on the screen by 3D real-time dynamic numerical, the distribution of welding temperature field and the residual stress is obtained and then the test results of welding residual stress are checked by Blind-hole method. The welding residual stress in the condition of anneal and non-anneal was comparatively analysed. The results show that the transverse and longitudinal residual stresses in the area near the weld are comparatively larger, and the variation trend of the transverse and longitudinal residual stresses in the area far away from the weld are nearly the same. It means that the FEM determination results coinciding with test results are available for reference to the design of the Wind-driven generator welding structure.

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Guo, De Peng, Xiao Ming Qian, Mao Lin Li, Wen Guang Zhang, Hong Wei Cai, and Gang Jin. "Examination and Repair on the Tube-Tube Sheet Welding Deviation of Steam Generator." Advanced Materials Research 803 (September 2013): 404–8. http://dx.doi.org/10.4028/www.scientific.net/amr.803.404.

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Tube-Tube sheet welding area of Steam Generator is one of the most fallibility positions in the first loop of Nuclear Power Plant. To make sure the Secondary side hydro-test of on site of Steam Generator is successful at the first round, the relative parties organize to check the 8948 Tube-Tube sheet sealing welding area before the test. Through the introduction of the Checking progress, for example, Defect confirming, Defect location, Defect dealing, Defect repair and other progress, the basic reason of deviation has been analyzed. And also, some discussions and concerns were given which will very useful as an experience feedback.

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11

Drimal, Daniel, and Frantisek Kolenic. "Laser Beam Welding of Borated Stainless Steel." Applied Mechanics and Materials 775 (July 2015): 138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.775.138.

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Laser beam welding of the absorption tubes made from stainless steel with increased boron content represent suitable production method of storage for spent nuclear fuel. This contribution presents results of weld joints investigation. The experiments were performed on borated stainless steel AISI 304 B6B with boron content 1.74 % wt. Weld joints were prepared by laser beam welding using fiber laser generator and examined by optical and electron microscopy.

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Shin, Ho Jun, Young Tae Yoo, and Byung Heon Shin. "A Study on the Welding Characteristics of Dissimilar Metal Using a High Power CW Nd:YAG Laser." Advanced Materials Research 26-28 (October 2007): 539–42. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.539.

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Laser welding process is widely used in the industrial field due to its numerous advantages: a small heat affected zone(HAZ), deep penetration, high welding speed, ease of automation, single-pass thick section capability, enhanced design flexibility, and small distortion after welding. In this paper, the laser weldability of Austenite stainless steel and INCONEL600 at dissimilar metal welds using a continuous wave Nd:YAG laser are experimentally investigated. INCONEL600 is being used in a steam generator tubing of pressurized water reactor(PWR) exposed to some corrosion. Therefore stress corrosion cracking can occur on this material. A research work is conducted to determine effects of welding parameters, on eliminating or reducing the extent welding zone formation at dissimilar metal welds and to optimize those parameters that have the most influence parameters such as focus length, laser power and welding speed were tested.

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Cargnelli, Michael, and Adam Rogowski. "A CAD-Based Robot Program Generator for a Welding Application." IFAC Proceedings Volumes 25, no. 23 (September 1992): 43–45. http://dx.doi.org/10.1016/s1474-6670(17)52226-0.

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14

Dubyk, Ya, B. Vasylchenko, S. Agieiev, and I. Oryniak. "Strength Analysis of PGV-1000M Steam Generator Support." Nuclear and Radiation Safety, no. 3(75) (August 22, 2017): 30–33. http://dx.doi.org/10.32918/nrs.2017.3(75).05.

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The paper presents the design of PGV-1000M steam generator support. It is shown that the load in the rolling support is distributed extremely unevenly, which is associated with the compliance of the support construction. It is demonstrated that under working loads only several rollers are used, the stresses in which exceed the yield strength. This can be an additional loading factor to be considered in the analysis of welding No. 111 failure.

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Iovanas, Radu, Cosmin Toma, Daniela Maria Iovanas, Ionut Claudiu Roata, and Viorel Anton. "Research on the Use of the MIG/MAG-Tandem Procedure in Welding X52MS Plates for the Manufacture of Pipelines." Advanced Materials Research 1128 (October 2015): 236–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1128.236.

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The pipelines used for carrying fluids and gas, made of specially designed steels in keeping with their intended uses, are obtained by welding on generator or by spiral welding, in a wide range of diameters (from 350 to 1800 mm) and pipe wall widths (between 6 and 40 mm). At present, the following welding procedures are used: automatic submerged arc welding (with 1 and 2 wires), combined with the unilateral or bilateral MIG/MAG welding procedure, according to plate thickness and edge working method. Ongoing researches focus on improving the end product [1, 2, 3, 4, 5, 6] by replacing the submerged arc welding procedure with other welding procedures which use less energy and have high deposit rates. This paper presents the results obtained by using tandem MAG welding, with two wires (2 x ø1.2 mm), in welding Y joint X52MS steel plates. The welds were carried out using a QUIROX 315 welding robot, with a 2-wire tandem MIG/MAG welding head, supplied by 2 QUINTO-GLC 603 welding sources, equipment found at Research Centre C12, Advanced Welding Eco-Technologies, owned by ICDD - UTBV. The results of the tests (carried out as per the enforceable regulations) concerning the characterisation of the executed welds proved that it is possible to obtain welds with lower energy use and lower material-relates costs and high productivity and quality.

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Tsushima, Sadao, and Haruo Fujita. "Pulse Generator for High-Current AC-MIG Welding Process. Development of AC-MIG Welding Process Report 2." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 10, no. 1 (1992): 88–95. http://dx.doi.org/10.2207/qjjws.10.88.

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Mnerie, Dumitru, and Gabriela Victoria Mnerie. "Study on some Behavioral Particularities of the Piezoceramic Elements from the Ultrasonic Converter Construction." Advanced Materials Research 1153 (May 2019): 58–63. http://dx.doi.org/10.4028/www.scientific.net/amr.1153.58.

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The ultrasound processing is in continuous development, always bringing better technological solutions. Ultrasonic welding occupies an important place within this category of processing. The present study focuses on some piezoceramic materials that represent the active elements in the structure of the required energy generator on which ultrasonic welding is based in fact. Using the analytical method of investigation, several aspects of piezoceramic material structural behavior during the exploitation were followed, both at macroscopic and microscopic level. Some causes and effects of changes to their functionality have been analyzed. The paper concludes with observations and recommendations on optimizing the manufacture and use of piezoceramic materials intended for converter construction for ultrasonic welding.

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Sawant, Suresh M., and Milind S. Yadav. "All Metal Low Resistance Oxy Hydrogen Gas Generator and its Integration with VCR Engine." Applied Mechanics and Materials 393 (September 2013): 481–86. http://dx.doi.org/10.4028/www.scientific.net/amm.393.481.

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Since its invention the oxy hydrogen gas has been used for many purposes like welding, lighting etc. In the recent past this gas has been experimented as a fuel additive in both SI as well as CI engines to improve the performance as well as emission parameters. Number of oxy hydrogen gas generators are designed and tested till today. This paper describes a new all metal low resistance oxy hydrogen gas generator which will be optimized in the later progress of the research work for maximum oxy hydrogen gas generation. In the later part of this paper a newly fabricated single cylinder twin spark variable compression ratio engine is discussed which will be further used for the testing of the oxy hydrogen gas from the optimized oxy hydrogen gas generator in blend with the hydrocarbon fuels at different compression ratios.

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Fan, Sheng Wen, and Yun Zhao. "The Performance Optimization Design of High Frequency and High Voltage Transformer of Electronic Beam Welder." Advanced Materials Research 383-390 (November 2011): 7202–7. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7202.

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High-frequency digital inverter power supply has the advantages of small, no noise, high efficiency, small ripp- le, and perfect protection, therefore, is gradually replacing the traditional electron beam welder which uses the 400Hz frequency generator. However, with more high frequency of the power supply, the design of the transformer used by the high-frequency high-voltage electron beam welding becomes difficult. Therefore, this paper put forward a diversified transformer mode and a voltage doubling rectifier circuit, which were used to reduce the transformer turns ratio, thus reducing the topology of the transformer distribution para- meters. Accordingly, a special high-frequency high-voltage electron beam welding tank is designed. Tests show that the set of performance indicators of the fuel tank meets the design goals to meet the actual needs of welding process.

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Jang, Hanhwi, Jong Bae Kim, Abbey Stanley, Suhyeon Lee, Yeongseon Kim, Sang Hyun Park, and Min-Wook Oh. "Fabrication of Skutterudite-Based Tubular Thermoelectric Generator." Energies 13, no. 5 (March 2, 2020): 1106. http://dx.doi.org/10.3390/en13051106.

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The conversion efficiency of the thermoelectric generator (TEG) is adversely affected by the quality of thermal contact between the module and the heat source. TEGs with the planar substrate are not suitable for the curved heat sources. Several attempts have been made to tackle this issue by fabricating complex tubular-shaped TEGs; however, all efforts have been limited to low-temperature applications. Furthermore, the electrical contact resistance of the module is critical to achieving a high-power output. In this work, we developed the tubular TEG with significantly low specific contact resistance by optimizing the joining process. We show that the modified resistance welding (MRW) performed by spark plasma sintering (SPS) is an efficient joining method for the fabrication of the TE module, with high feasibility and scalability. This research seeks to suggest important design rules to consider when fabricating TEGs.

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GUO, Guangyao. "Research of Electron Beam Generator in Precision Welding by Laser Heating Cathode." Journal of Mechanical Engineering 50, no. 10 (2014): 93. http://dx.doi.org/10.3901/jme.2014.10.093.

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Kitajima, Toshio. "Development of superconducting generator and structure, materials and welding of its rotor." Journal of the Japan Welding Society 58, no. 1 (1989): 29–34. http://dx.doi.org/10.2207/qjjws1943.58.29.

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Li, Hui Fang, Cai Fu Qian, and Xiao Dong Yu. "Thermal Stress Analysis of a Tubesheet with a Welding Clad." Advanced Materials Research 201-203 (February 2011): 302–7. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.302.

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In this paper, numerical simulation was carried out for the tube bundle of a slurry oil steam generator with concentration on the thermal stresses at the tubesheet with or without a welding clad on the tubesheet surface. It is found that as having a larger heat expansion coefficient, thermal expansion of the welding clad is constrained and most areas are in compressive state. But the tensile stresses in the clad are also notable especially at the interface and could break the clad if added by the tensile stresses produced by pressure loadings. Presence of the welding clad causes significant tensile stresses in the base tubesheet. It is possible that the maximum tensile stress comprised by the thermal tensile stress and pressure induced tensile stress will exceed the tensile strength of the material and cause initiation of cracks in the tubesheet.

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Stupina, A. A., I. A. Panfilov, O. A. Antamoshkin, E. L. Vaitekunene, N. V. Fedorova, and D. V. Eremeev. "Design of an electron beam welding installation based on the existing equipment for connecting pipelines without using a vacuum." Journal of Physics: Conference Series 2094, no. 4 (November 1, 2021): 042011. http://dx.doi.org/10.1088/1742-6596/2094/4/042011.

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Abstract The article is aimed at solving the problem of connecting pipelines using electron beam welding. During the presented study, the analysis of the object of study - the main oil pipeline was carried out, during which the main shortcomings in the formed welded joints were identified. The authors also analyzed the methods of forming welded joints, which showed the advantages of electron-beam technology. The means of electron beam welding were selected: a generator, an electron beam gun. The electrical characteristics of the installation have been calculated, which make it possible to formulate the requirements for the purchased equipment. As a result, the authors have designed an installation for electron-beam welding of joints of the main pipeline elements, which makes it possible to form welded seams up to 400 mm deep and 1 mm wide.

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Bondarenko, Oleksandr, Ievgen Verbytskyi, Vadym Prokopets, Oleksandr Kaloshyn, Denys Spitsyn, Tetiana Ryzhakova, and Yuliia Kozhushko. "Modular Power Supply for Micro Resistance Welding." Electrical, Control and Communication Engineering 12, no. 1 (July 1, 2017): 20–26. http://dx.doi.org/10.1515/ecce-2017-0003.

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Abstract The study is devoted to the important issue of enhancing the circuitry and characteristics of power supplies for micro resistance welding machines. The aim of the research is to provide high quality input current and to increase the energy efficiency of the output pulse generator by means of improving the circuit topologies of the power supply main blocks. In study, the principle of constructing the power supply for micro resistance welding, which provides high values of output welding current and high accuracy of welding pulse formation, makes it possible to reduce energy losses, and provides high quality of consumed input current, is represented. The multiphase topology of the charger with power factor correction based on SEPIC converters is suggested as the most efficient for charging the supercapacitor storage module. The multicell topology of the supercapacitor energy storage with voltage equalizing is presented. The parameters of the converter cells are evaluated. The calculations of energy efficiency of the power supply’s input and output converters based on suggested topologies are carried out and verified in MATLAB Simulink. The power factor value greater than 99 % is derived.

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Liu, Chong, Chang Hua Qiu, and Lei Gao. "Dynamics Analysis and Vibration Isolation Design of Shared Foundation on Marine Turbo Generator Set." Key Engineering Materials 572 (September 2013): 193–96. http://dx.doi.org/10.4028/www.scientific.net/kem.572.193.

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Considering the ship's limited space, high speed and miniaturization have been design directions in marine turbo generator set. The shared foundation with steel plate welding is designed to support the marine turbo generator set. Stiffness and dynamic characteristic of the shared foundation will directly affect the stable operation of the turbo generator set. The paper established the dynamics analysis model for the shared frame of marine turbo generator set according to the 'Lumped Mass Method'. Taking account of the frequency-domain analysis operability, the operational modal analysis and dynamical response on foundation were carried out by Virtual Lab. Based on these results; the intensity and location of exciting force were ascertained. And then, we designed the shared foundation vibration isolation system, and analyzed the characteristics of the vibration isolation mounting. The result shows that the vibration isolation system can minimize output force transmissibility and reduce the effect of the marine turbo generator set vibration.

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Stojanovic, Tatjana, Miroslav Milicevic, and Valentina Nejkovic. "Review tube oscilator and practical betterment in generator for HF welding steel tube." Termotehnika 42, no. 1 (2016): 51–63. http://dx.doi.org/10.5937/termoteh1601051s.

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He, Guang-qing, Zhen-guo Yang, Bin Xi, You-peng Zhang, Disi Wang, Bo Liu, and Song Li. "Deformation control during the welding of AP1000 main pump casing and steam generator." Nuclear Materials and Energy 29 (December 2021): 101090. http://dx.doi.org/10.1016/j.nme.2021.101090.

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Zheng, Zhi Hua, Dai Hua Yang, and Yan Shen Wang. "The Application of Vacuum Power for Drill Automatic Welding Device." Applied Mechanics and Materials 602-605 (August 2014): 1340–43. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1340.

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In this paper, a vacuum suction cup robot is introduced, which is used in drill bolt welding machine to add silver brazing sheets. This paper briefly discusses the application of vacuum power on the device. Then through the selection of the degree of vacuum and a vacuum generator, the selection and calculation of the chuck size specify the design process of the vacuum power system. Finally, through the working process of the manipulator and the structural design of the silver brazing box briefly introduce the movement of the vacuum suction manipulator.

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Afshari, Aliakbar, Patti C. Zeidler-Erdely, Walter McKinney, Bean T. Chen, Mark Jackson, Diane Schwegler-Berry, Sherri Friend, et al. "Development and characterization of a resistance spot welding aerosol generator and inhalation exposure system." Inhalation Toxicology 26, no. 12 (August 20, 2014): 708–19. http://dx.doi.org/10.3109/08958378.2014.941118.

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Knyaz'kov, A., O. Pustovykh, A. Verevkin, V. Terekhin, A. Shachek, S. Knyaz'kov, and A. Tyasto. "Control of the electrode metal transfer by means of the welding current pulse generator." IOP Conference Series: Materials Science and Engineering 124 (April 2016): 012146. http://dx.doi.org/10.1088/1757-899x/124/1/012146.

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KIRA, AKIO, KAZUYUKI HOKAMOTO, YASUHIRO UJIMOTO, SHOICHIRO KAI, and MASAHIRO FUJITA. "OBSERVATION OF METAL JET IN EXTREMELY HIGH IMPULSIVE PRESSURE GENERATOR." International Journal of Modern Physics B 22, no. 09n11 (April 30, 2008): 1653–58. http://dx.doi.org/10.1142/s0217979208047213.

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A new technique has been developed to generate an extremely high impulsive pressure by using an explosive. A metal jet, typically observed in explosive welding is used in this technique. The behavior of metal jet is crucial to the design of pressure generator. The experimental observation was made by the collision of metal jet on a metal block surface. Many craters formed by the collision of metal jets on the surface of the metal block were observed. The craters were overlapped and distributed in a wide range. The diameter of the largest crater was 0.5 mm. The quantity of the discharged metal jets was found to be a function of the quantity of explosive. The total area of the craters is considered as proportional to the quantity of the discharged metal jets and the experimental conditions for the formation of large craters was investigated.

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S., Vinod, and Balaji M. "Variable speed PMSG design and implementation for wind driven welding power source." Circuit World 46, no. 3 (January 27, 2020): 161–67. http://dx.doi.org/10.1108/cw-08-2019-0108.

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Purpose The purpose of this paper is the attempt to model a variable speed permanent magnet synchronous generator (PMSG) for extracting a standalone power source to assuage the needs of a welding application. The emphasis orients to evolve a framework for the effective exploration of renewable energy resource and prevent the injection of grid harmonics. Design/methodology/approach The system involves the use of self-commutated dc-dc converter interfaces to extradite the current and voltage requirements of the welding attributes. The philosophy incites a pulse width formulation for reducing the voltage ripples in the dc output and improving the time response characteristics. Findings The proper selection of closed loop Fuzzy tuned PI control ensures the restriction on the magnitude of the current drawn from the source, enhances the dynamic response and betters steady state response. Originality/value PMSG-based welding power source with parallel-connected cascaded buck fed cuk converters. MATLAB-based simulation of the methodology offer interesting results in the sense it orchestrates the range of converter operation and the ability to provide a high-quality weld without polluting the ac mains. The experimental prototype further proliferates to validate the simulated performance and claims a space for its use in the real-world utilities.

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Beketov, V. G., V. I. Surin, A. E. Dembitsky, A. A. Abu Ghazal, and A. I. Alwaheba. "Control Quality of Welded Joints by Scanning Contact Potentiometry Method." KnE Engineering 3, no. 3 (February 21, 2018): 219. http://dx.doi.org/10.18502/keg.v3i3.1621.

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Conducted evaluation of technical state of welded joints, welding the collectors of the primary loop to the body of the sample of steam generator PGV 1000, located in Resource center National Research Nuclear University MEPhI at "AEM-Technologies" Atommash factory in Volgodonsk. The results of point-by-point scan shows that SLS 1000 µv and above, for almost all samples detected multiple superficial imperfections caused by the presence of certain rust spots and traces of a deep spot corrosion, and the presence of small nicks, scratches and other imperfections.

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Dewanto, Henanto Pandu, Dwi Aries Himawanto, and Sukmaji Indro Cahyono. "Pembuatan dan pengujian turbin propeller dalam pengembangan teknologi pembangkit listrik tenaga air piko hidro (PLTA-PH) dengan variasi debit aliran." Jurnal Teknik Mesin Indonesia 12, no. 2 (March 7, 2018): 54. http://dx.doi.org/10.36289/jtmi.v12i2.72.

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Hydroelectric power plants (hydropower) with a power generated capacity of less than 5 kW called "Pico Hydro" (hydropower-PH). Pico Hydro is one of the renewable energy sources that are environmentally friendly. In this study aims to: (1) the manufacture hydropower plants Pico Hydro energy-efficient, renewable and environmentally friendly; (2) determine the efficiency of the turbine with the testing of flow variation; (3) determine the efficiency of generator. Designing and making portable water turbines are easily in the manufacture, operation, and maintenance and has a high efficiency and effectiveness that can use the method of reverse engineering. The production process is performed to create a turbine by the lathe and welding processes. While the materials used are mild steel. Results of this study were found that: (1) the manufacturing process of hydropower plants Pico Hydro can be performed easily by the public; (2) the type of turbine used in hydropower-PH testing is a propeller turbine with 4 blades; (3) flow measurement with V-Notch method showed the following actual debit are 5.38 x10-3 (m3/s), 6.62 x10-3 (m3/s), 7.69 x10-3 (m3/s) and 8.84 x10-3 (m3/s. Turbine efficiency is 3.59 %, 4.26 %, 5.66 % and 7.54 %. The efficiency of the generator has a value of 39.31 %, 40.51 %, 32.55 % and 30.45 %.

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Pozniakov, V., L. Markashova, O. Berdnikova, T. Alekseienko, and S. Zhdanov. "Structure and Crack Resistance of N-A-XTRA-70 Steel Joints Manufactured by Hybrid Laser-Arc Welding." Materials Science Forum 927 (July 2018): 29–34. http://dx.doi.org/10.4028/www.scientific.net/msf.927.29.

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Crack resistance of welded joints is one of the most important indices of service reliability of critical designation structures. The purpose of the research is the establishment of the influence of technological modes, hybrid laser-arc welding of high strength steel NA-XTRA-70 on the formation of structure in the metal welded joints, as well as analysis of the influence of this structure on their crack resistances. For the experiments the laboratory setup has been developed on which the experiments were carried out in the technological scheme that provides the location of the consumable electrode arc at a certain distance in front of the laser beam in the welding direction. Nd: YAG-laser DY 044 of company ROFIN (Germany) was a laser radiation source. Power for consumable electrode arc was carried out by welding generator PSG-500. Investigations of structural-phase changes in weld metal and HAZ were carried out by means of optical microscopy (optical microscope Versamet-2 and Neophot-32), microhardness was measured using M-400 gage of Leco company at 0.98N loading. Fractographic investigations were carried out by scanning electron microscopy (scanning electron microscope SEM-515 of PHILIPS company, Netherlands) on fractured specimens of welded joints, made as a result of impact bend tests. An analysis of crack resistance of the welded joints was carried out under different conditions of test temperatures. It was based on experimental data, received by a quantitative fractography method. It is shown that metal of a welded joint produced by hybrid laser-arc welding at Vw = 72m/h rate has mainly failure of ductile nature after external loading. This indicates sufficient level of crack resistance and further working capacity under operation conditions.

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Kim, Sung-Hoon, and Sung-Hoon Jin. "Development of Automatic Mesh Generator for Welding Heat Transfer Analysis using Rosenthal Prediction and Advancing Fontal Technique." Joural of the Korea Entertainment Industry Association 8, no. 3 (September 30, 2014): 151. http://dx.doi.org/10.21184/jkeia.2014.09.8.3.151.

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Rauch, Matthieu, Jean-Yves Hascoet, and Vincent Querard. "A Multiaxis Tool Path Generation Approach for Thin Wall Structures Made with WAAM." Journal of Manufacturing and Materials Processing 5, no. 4 (November 30, 2021): 128. http://dx.doi.org/10.3390/jmmp5040128.

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Wire Arc Additive Manufacturing (WAAM) has emerged over the last decade and is dedicated to the realization of high-dimensional parts in various metallic materials. The usual process implementation consists in associating a high-performance welding generator as heat source, a NC controlled 6 or 8 degrees (for example) of freedom robotic arm as motion system and welding wire as feedstock. WAAM toolpath generation methods, although process specific, can be based on similar approaches developed for other processes, such as machining, to integrate the process data into a consistent technical data environment. This paper proposes a generic multiaxis tool path generation approach for thin wall structures made with WAAM. At first, the current technological and scientific challenges associated to CAD/CAM/CNC data chains for WAAM applications are introduced. The focus is on process planning aspects such as non-planar non-parallel slicing approaches and part orientation into the working space, and these are integrated in the proposed method. The interest of variable torch orientation control for complex shapes is proposed, and then, a new intersection crossing tool path method based on Design For Additive Manufacturing considerations is detailed. Eventually, two industrial use cases are introduced to highlight the interest of this approach for realizing large components.

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Mikheev, Vladimir A., Marina M. Demidova, Roberto de Alvarenga, and Victor I. Zarembo. "Research the Effect of Stress-Pulse Regulation on the Process of Manual Arc Welding Technological Plates Made of AMg6 Alloy Sheet Material 4mm Thickness." Materials Science Forum 989 (May 2020): 739–46. http://dx.doi.org/10.4028/www.scientific.net/msf.989.739.

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The result of the effect of stress-pulse regulation on the process of manual arc welding with the connection of pulse generator is presented. Technology of stress-pulse regulation is accessible and easy to use: the equipment is so small that it can be applied in any convenient place. At the same time, there is a practical alignment of the microhardness of the zone of the base metal of the welded plates, the transition zone and the zone of the weld, which indicates the absence of residual stresses of the welded parts. The results of the research confirm the effectiveness and prospects stress-pulse regulation in any production.

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Kundu, Anupam, Dilip Kumar Pratihar, and Abhishek Rudra Pal. "A review on micro-electron beam welding with a modernized SEM: Process, applications, trends and future prospect." Journal of Micromanufacturing 2, no. 2 (August 26, 2019): 220–25. http://dx.doi.org/10.1177/2516598419855186.

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Electron beam welding (EBW) is a well-established joining method in the field of manufacturing. If this technology is downscaled to a micro-level (i.e., micro-EBW (µ-EBW)), it will be able to solve a variety of problems. The necessity of adopting µ-EBW technology lies with the fact that it can be used from micro-mechanical fabrication to micro-electronics components joining, micro-electro-mechanical system (MEMS), medical instrument, etc. µ-EBW has some special properties like the possibility of obtaining exact focussing of the beam and conducting measurement up to micrometer level, accurate control of energy input, inertia-free manipulation, high-frequency oscillation movement and ability to work under high vacuum chamber. µ-EBW has several important applications like micro-joining and micro-fabrication, which is welding of dissimilar materials. This article deals with a review of the recent developments, significant applications, and advantages of µ-EBW, multiple modes of joining and also some new technologies such as scanning electron microscope, function generator, control software, etc. Finally, the current challenges of this emerging technology and the scopes for future studies have been presented in this article.

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Spisák, Bernadett, Zoltán Bézi, and Szabolcs Szávai. "Study of the Stress State of a Dissimilar Metal Weld Due to Manufacturing and Operational Conditions." Periodica Polytechnica Mechanical Engineering 66, no. 2 (March 22, 2022): 120–28. http://dx.doi.org/10.3311/ppme.19063.

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Welding is accompanied by the presence of weld residual stresses, which in case of dissimilar metal welds even with post weld heat treatment cannot be removed completely therefore they should be considered when assessing possible welding defects. The measurement of residual stress in metal weld is a very complex procedure and also in the investigated case could not be carried out as it is the part of a working plant. However, by modelling these processes, the residual stresses and deformation of the components caused by this manufacturing method can be determined. It is important to calculate these values as accurately as possible to determine the maximum load capacity of the structure. The structure under examination was the dissimilar metal weld of a VVER-440 steam generator. 2D simulations were performed, where temperature and phase-dependent material properties were implemented. Different loading scenarios were considered in the numerical analysis. The results can be useful to determine the real loading conditions of a given component and can be used to predict stress corrosion crack initiation locations, as well as to evaluate the lifetime and failure mode prediction of welded joints.

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Antonini, James M., Aliakbar A. Afshari, Sam Stone, Bean Chen, Diane Schwegler-Berry, W. Gary Fletcher, W. Travis Goldsmith, et al. "Design, Construction, and Characterization of a Novel Robotic Welding Fume Generator and Inhalation Exposure System for Laboratory Animals." Journal of Occupational and Environmental Hygiene 3, no. 4 (April 2006): 194–203. http://dx.doi.org/10.1080/15459620600584352.

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KIM, Konstantin K., and Aleksandr Yu PANYCHEV. "Innovative electrical engineering developed for the transport industry by the Emperor Alexander I Petersburg State Transport University." BULLETIN OF SCIENTIFIC RESEARCH RESULTS 2021, no. 4 (December 2021): 87–103. http://dx.doi.org/10.20295/2223-9987-2021-4-87-103.

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Objective: To familiarize the general scientific community with the latest electrotechnical innovative developments for the transport industry, carried out by the scientists of the Emperor Alexander I Petersburg State Transport University in the period from 2000 to 2021. Methods: We used the methods of calculation of electromagnetic fields and circuits, mathematical analysis, mathematical physics and numerical methods in the development of the described devices and systems. Results: 101 We developed a pipeline high-speed magnetolevitation transport system with vehicle movement in a rarefied atmosphere, a series of pantograph pantographs for heavy-loaded and high-speed trains using solid lubricants and a contactless method of transmitting electrical energy, a plasma device for fine cleaning of circuit boards for microcircuits, a device for creating a comfortable climate in office premises, electrohydroimpulse installations designed for loosening frozen coal in gondola cars in winter, shock tests of wagons, escalators and travalators using linear electric motors, high-speed electric switches-breakers, heat generators based on an electromechanical converter with the functions of a heater and pump, a wagon generator with a forced excitation system, a pulse voltage generator, allowing to measure the pulse resistance of the grounding conductors of the contact network supports, a complex of installations for various purposes using ozone technologies, a system for laser monitoring of the integrity of tanks, a device for diagnosing the degree of corrosion of the fittings of contact supports, an electrohydroimpulse installation for impact welding, treatment plants, technology for recycling car tires, security systems of the main trackbed. Practical importance: The use of the described developments will increase energy efficiency, energy saving and safety of production processes in transport

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Drehmann, Rico, Christian Scheffler, Sven Winter, Verena Psyk, Verena Kräusel, and Thomas Lampke. "Experimental and Numerical Investigations into Magnetic Pulse Welding of Aluminum Alloy 6016 to Hardened Steel 22MnB5." Journal of Manufacturing and Materials Processing 5, no. 3 (June 24, 2021): 66. http://dx.doi.org/10.3390/jmmp5030066.

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By means of magnetic pulse welding (MPW), high-quality joints can be produced without some of the disadvantages of conventional welding, such as thermal softening, distortion, and other undesired temperature-induced effects. However, the range of materials that have successfully been joined by MPW is mainly limited to comparatively soft materials such as copper or aluminum. This paper presents an extensive experimental study leading to a process window for the successful MPW of aluminum alloy 6016 (AA6016) to hardened 22MnB5 steel sheets. This window is defined by the impact velocity and impact angle of the AA6016 flyer. These parameters, which are significantly dependent on the initial gap between flyer and target, the charging energy of the pulse power generator, and the lateral position of the flyer in relation to the inductor, were determined by a macroscopic coupled multiphysics simulation in LS-DYNA. The welded samples were mechanically characterized by lap shear tests. Furthermore, the bonding zone was analyzed by optical and scanning electron microscopy including energy-dispersive X-ray spectroscopy as well as nanoindentation. It was found that the samples exhibited a wavy interface and a transition zone consisting of Al-rich intermetallic phases. Samples with comparatively thin and therefore crack-free transition zones showed a 45% higher shear tensile strength resulting in failure in the aluminum base material.

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Rauch, Matthieu, Gatien Pechet, Jean Yves Hascoet, and Guillaume Ruckert. "Extending High Value Components Performances with Additive Manufacturing: Application to Naval Applications." Solid State Phenomena 319 (June 14, 2021): 58–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.319.58.

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Additive Manufacturing (AM), consists of depositing material in successive layers to obtain the desired part. The parts produced by AM can thus adopt geometries inaccessible by conventional manufacturing means, for example hollow or lattice structures which considerably reduce their weight while keeping or even improving their mechanical properties. Among the many existing processes, Wire Arc Additive Manufacturing (WAAM) is particularly well suited to the manufacture of large metallic parts. It is characterized by a supply of heat in the form of an electric arc (produced by a welding generator) and a supply of material in the form of wire. This paper will discuss the impact of additive manufacturing to enhance the performances of high value components, based on naval application: the manufacturing of a hollow propeller blade demonstrator of 1.5 m high realized in the laboratory.

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Liu, S. J., and Y. T. Dung. "Ultrasonic Vibration Hot Embossing." International Polymer Processing 20, no. 4 (August 1, 2005): 449–52. http://dx.doi.org/10.1515/ipp-2005-0074.

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Abstract Hot embossing has become a popular method for replicating precise micro-features onto large plastic plates. However, a long cycle time of the process due to conventional electric heating or hot oil heating is one of problems that confound the overall success of this technology. This study proposed a novel hot embossing method by using ultrasonic vibration as a heat generator. Experiments were carried out on a 2000-watt ultrasonic welding machine. A 2 mm thick polymethyl methyl acrylic (PMMA) plate was used for embossing microstructures onto its surface. The results in this study suggest that ultrasonic vibration hot embossing can provide an effective way of molding microstructures onto the surface of polymeric plates. Nevertheless, this novel process will need some improvements in the design of the ultrasonic vibration machine in order to make the process feasible.

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Savoie, Jean, and Melinda Bissinger. "Case Studies and Applications of Flowforming to Aircraft Engine Component Manufacturing." Key Engineering Materials 344 (July 2007): 443–50. http://dx.doi.org/10.4028/www.scientific.net/kem.344.443.

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Aircraft engine components are assemblies of several parts that are manufactured using various processes: deep drawing and machining, among others. Deep drawing cannot control accurately wall thicknesses and is performed in numerous steps. Machining parts from solids is less and less cost effective as prices for raw materials increase. Hence, the use of near net shape manufacturing methods is becoming more appealing. An alternative forming process is here investigated: flowforming, process well adapted to axisymmetric parts. The amount of forming steps, welding and machining could be significantly reduced, reducing lead-times and manufacturing costs. Examples are presented for the forming of selected parts (gas generator cases, fan cases and diverter ducts), together with their metallurgical and mechanical properties. Flowforming, however, can only generate shells with some hollow details: most flanges, bosses, stiffeners or weld lips cannot be obtained. Hence, methods of adding material are explored.

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Momčilović, Dejan, and Zoran Odanović. "Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation." Advanced Materials Research 1153 (May 2019): 36–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1153.36.

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Turbine and generator rotors and shafts undergo high stresses during regular working life and, from a safety and operational aspect, are the most significant components of a power generation system. Depending on the appropriate operating conditions, like temperature and/or corrosion the, shafts can be fabricated out of low/high alloy heat resistance material or of low alloyed, highly toughened material for different application. Despite known good practice and developed operation procedures, the failures of shafts sometimes occur. The right and well-defined failure analysis is the basis for feasibility analysis of repair method in the power generating industry. The analysis of direct and indirect costs of repair after the failure analysis as well as the analysis of the repair and post-repair conditions of the repaired element is the vital for decision on the key question. Is it possible to repair this element and what is the optimal repair strategy? This paper compares and analyses two approaches, by weldability analysis and weld cycle simulation, in order to determine welding feasibility analysis of cracked hydro turbine shafts.

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Ozhigov, L. S., V. N. Voevodin, A. S. Mitrofanov, and R. L. Vasilenko. "Types and analysis of defects in welding junctions of the header to steam generator shells on power-generating units with VVER-1000." Thermal Engineering 63, no. 10 (September 16, 2016): 738–46. http://dx.doi.org/10.1134/s0040601516080085.

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Kimme, Jonas, Josephine Zeisig, Alexander Fröhlich, and Verena Kräusel. "Technology Innovation for the Manual Laser Cladding of High-Alloy Tool Steels." Metals 11, no. 11 (November 12, 2021): 1820. http://dx.doi.org/10.3390/met11111820.

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This paper presents the development and successful application of an inductive preheating system running simultaneously with the manual laser cladding process in order to enable the repair of high-alloy tool steels having a highly limited weldability. In this study, the design and optimization of a suitable inductor as well as the analysis of the welding process were carried out by means of FE-simulation in order to generate material deposition without imperfections. Parameter variation studies were conducted while parallel modifying the generator power resulting in different preheating temperatures. These examinations showed that by using appropriate process parameters and an inductive preheating temperature of 200 °C, crack- and pore-free deposition layers could be produced on the commercial high-alloyed PM steel Elmax. This result can be explained by FE-simulation demonstrating that the cooling rate was halved in the weld and in the heat-affected zone. In conclusion, this study shows the high potential of the developed technical innovation for the manual laser cladding of high-performance tools.

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Journal articles on the topic 'Welding generator'

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