Artykuły w czasopismach: „Welding-Techniques”

1

Ravi, R. "Welding Management-Techniques for Welding Leadership". Indian Welding Journal 32, nr 2 (1.04.1999): 45. http://dx.doi.org/10.22486/iwj.v32i2.177671.

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Alajmi, Esam F., i Ahmad A. Alqenaei. "Underwater Welding Techniques". International Journal of Engineering Research and Applications 7, nr 2 (luty 2017): 14–17. http://dx.doi.org/10.9790/9622-0702031417.

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SAKAI, Katsuhiko. "Monitoring techniques of Laser Welding". Journal of the Japan Welding Society 72, nr 4 (2003): 256–59. http://dx.doi.org/10.2207/qjjws1943.72.256.

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MATSUYAMA, Kin-ichi. "Simulation techniques in resistance spot welding." Journal of the Japan Welding Society 70, nr 5 (2001): 596–609. http://dx.doi.org/10.2207/qjjws1943.70.5_596.

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Komizo, Yuichi. "In situmicrostructure observation techniques in welding". Welding International 24, nr 12 (grudzień 2010): 949–54. http://dx.doi.org/10.1080/09507111003655333.

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Łabanowski, Jerzy. "Development of under-water welding techniques". Welding International 25, nr 12 (grudzień 2011): 933–37. http://dx.doi.org/10.1080/09507116.2010.540847.

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Massetti, F. "New welding techniques for suspension bridges". Welding International 18, nr 10 (październik 2004): 785–97. http://dx.doi.org/10.1533/wint.2004.3323.

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Nixondg, J., i J. Billingham. "A survey of underwater welding techniques". Endeavour 11, nr 3 (styczeń 1987): 143–48. http://dx.doi.org/10.1016/0160-9327(87)90203-1.

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Camilleri, D., i T. G. F. Gray. "Computationally efficient welding distortion simulation techniques". Modelling and Simulation in Materials Science and Engineering 13, nr 8 (17.11.2005): 1365–82. http://dx.doi.org/10.1088/0965-0393/13/8/012.

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John, Merbin, Orlando Diaz, Andres Esparza, Aaron Fliegler, Derek Ocenosak, Carson Van Dorn, Udaya Bhat K. i Pradeep L. Menezes. "Welding Techniques for High Entropy Alloys: Processes, Properties, Characterization, and Challenges". Materials 15, nr 6 (19.03.2022): 2273. http://dx.doi.org/10.3390/ma15062273.

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High entropy alloys (HEAs) are the outstanding innovations in materials science and engineering in the early 21st century. HEAs consist of multiple elements with equiatomic or near equiatomic compositions, which exhibit superior mechanical properties, such as wear resistance, fatigue resistance, and corrosion resistance. HEAs are primarily used in structural and functional applications; hence, appropriate welding processes are essential to enhancing the performances and service lives of HEA components. Herein, a comprehensive overview of current state-of-art-of welding techniques for HEAs is elucidated. More specifically, the article discusses the fusion-based welding techniques, such as gas tungsten arc welding (GTAW) and laser beam welding (LBW), and solid-state welding techniques, such as friction stir welding (FSW) and explosive welding (EB), for a broad category of HEAs. In addition, the microstructural features and mechanical properties of HEAs welded using different techniques were explained for a broad spectrum of HEAs. Finally, this review discusses potential challenges in the welding of HEAs.

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Perka, Ashok Kumar, Merbin John, Udaya Bhat Kuruveri i Pradeep L. Menezes. "Advanced High-Strength Steels for Automotive Applications: Arc and Laser Welding Process, Properties, and Challenges". Metals 12, nr 6 (20.06.2022): 1051. http://dx.doi.org/10.3390/met12061051.

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In recent years, the demand for advanced high-strength steel (AHSS) has increased to improve the durability and service life of steel structures. The development of these steels involves innovative processing technologies and steel alloy design concepts. Joining these steels is predominantly conducted by following fusion welding techniques, such as gas metal arc welding, tungsten inert gas welding, and laser welding. These fusion welding techniques often lead to a loss of mechanical properties due to the weld thermal cycles in the heat-affected zone (HAZ) and the deposited filler wire chemistry. This review paper elucidates the current studies on the state-of-the-art of weldability on AHSS, with ultimate strength levels above 800 MPa. The effects of alloy designs on the HAZ softening, microstructure evolution, and the mechanical properties of the weld joints corresponding to different welding techniques and filler wire chemistry are discussed. More specifically, the fusion welding techniques used for the welding of AHSS were summarized. This review article gives an insight into the issues while selecting a particular fusion welding technique for the welding of AHSS.

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Kim, Young-Min, Insung Hwang i Jason Cheon. "Recent Research Trend of Resistance Spot Welding Quality Monitoring Technology in Korea". Journal of Welding and Joining 41, nr 2 (30.04.2023): 90–99. http://dx.doi.org/10.5781/jwj.2023.41.2.2.

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Resistance spot welding is a simple welding process with high welding speeds and one of the most economical and productive welding processes. It is applied in various industries such as automobile, aircraft, and home appliance; thus, the demand for monitoring welding quality is increasing. Owing to the nature of the resistance spot welding process, there are several factors that can be monitored, such as the dynamic resistance value, which can be determined using current and voltage measurements, the displacement of welding electrodes, and the indentation that occurs after welding. These process features can be monitored using cameras, LVDT sensors, and deep learning techniques and used for predicting weld quality. In this paper, we introduced the recent trends in resistance spot welding quality monitoring techniques in Korea using various sensors and techniques.

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Tonkovic, M. P., M. Gojic, B. Karpe i L. Kosec. "Secondary ledeburite formation during various welding techniques". Journal of Mining and Metallurgy, Section B: Metallurgy 51, nr 2 (2015): 117–23. http://dx.doi.org/10.2298/jmmb140616014t.

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The occurrence and formation sequence of secondary ledeburite in the heat affected zone of chromium ledeburitic tool steel W.Nr. 1.2379 (OCR12 VM) after welding with SAW, TIG, microplasma and laser welding techniques is presented in this paper. Special attention was paid on the behaviour of carbides. The occurrence of secondary ledeburite is a result of local enrichment of the austenite matrix with alloying elements, due to partial or complete dissolution of primary/eutectic carbides. The results show that the largest amount of secondary ledeburite is formed during submerged arc welding, followed by TIG and microplasma welding technique. Welding by laser technique, with appropriate technological parameters, could prevent secondary ledeburite formation.

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Kumar, K. Ratna, G. Madhusudhan Reddy i K. Srinivasa Rao. "Microstructure and Corrosion Behavior of Cast A356 and Wrought AA6061 Aluminium Alloy Welds". Advanced Materials Research 117 (czerwiec 2010): 37–42. http://dx.doi.org/10.4028/www.scientific.net/amr.117.37.

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In this work, it was intended to improve the corrosion resistance of welds of A356 and AA6061 by adopting mainly a special welding techniques, viz., pulsed current gas tungsten arc welding (PCGTAW), electron beam welding (EBW) and friction stir welding (FSW). It was found that the corrosion resistance of A356 and AA6061 welds could be improved by PCGTAW technique rather than continuous current gas tungsten arc welding (CCGTAW). It can be further improved by using electron beam welding. Improved corrosion resistance in A356 welds could be obtained by selecting T6 temper rather than as cast condition. In the case of AA6061, improved corrosion resistance was achieved by selecting T4 temper rather than T6 temper. As for as the welding techniques, friction stir welding (FSW) is useful than fusion welding techniques like CCGTAW,PCGTAW and EBW for improving the corrosion resistance of both the welds.

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Brown, S. B., i H. Song. "Rezoning and Dynamic Substructuring Techniques in FEM Simulations of Welding Processes". Journal of Engineering for Industry 115, nr 4 (1.11.1993): 415–23. http://dx.doi.org/10.1115/1.2901784.

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Distortion and residual stresses cause significant problems in the welding of large structures. Prediction of these phenomena would provide substantial assistance to the design and fabrication of welding. Unfortunately, the complexity of structural interactions during welding and the severe nonlinearities associated with the welding process limit the application of weld simulations. This presentation develops rezoning and dynamic substructuring techniques that make the finite element welding simulation of large structures more tractable. Both techniques exploit the fact that only a local zone around the welding electrode is nonlinear during welding. We therefore model the local nonlinear zone around the electrode or heat source with a dense finite element mesh. The rest of the larger structure is modeled using both a coarser mesh and substructures. The model is then redefined incrementally to represent the motion of the electrode through the larger structure. The redefinition is performed on the deformed geometry of the previous increment, achieving a step-wise coupled thermo-mechanical analysis. The techniques are applied to a two-dimensional plate welding example, achieving significant reductions in model size. Computer memory requirements and analysis times achieve close to order-of-magnitude reductions. Three-dimensional welding simulations should experience greater reductions in analysis time. Although developed for welding applications, the rezoning and dynamic substructuring techniques can also be used for other analyses involving a small nonlinear zone translating within a larger elastic body.

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French, Richard, Hector Merin-Reyes i Will Yeadon. "A Feasibility Study Comparing Two Commercial TIG Welding Machines for Deep Penetration". MATEC Web of Conferences 269 (2019): 01004. http://dx.doi.org/10.1051/matecconf/201926901004.

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Developing a deep penetration TIG welding technique to produce welds of equal quality to the industrial standard practise of laser-based welding techniques has the potential to lower production complexity and cost. Higher currents levels are required to increase penetration depth in conventional TIG welding but this results in excessive weld bead width amongst other detrimental effects. However, through K-TIG and A-TIG techniques these detrimental effects can be circumnavigated. Prior experimental work on weld pool dynamics in conventional TIG welding in higher current regions has been sparse as TIG welding enhanced through novel techniques provides the best quality welds. This paper is an early feasibility study for novel deep penetration welding techniques motivated by observations made during research done at The University of Sheffield where unexpected activity in the weld pool was identified during TIG welding with a VBC IE500DHC between 300A – 1000A. This current range is labelled the ‘Red Region’. Understanding the fluid dynamics of the molten metal in the weld pool at the ‘ Red Region' current level will help in the creation of novel techniques for deep penetration TIG welding. Addressing this, this paper compares the quality of welds produced between 100A and 200A on 316 Stainless Steel by two industrially leading welding machines; the Miller Dynasty 350 and the VBCie 500DHC.

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R, Rishikesh Mahadevan, Avinaash Jagan, Lakshmi Pavithran, Ashutosh Shrivastava i Senthil Kumaran Selvaraj. "Intelligent welding by using machine learning techniques". Materials Today: Proceedings 46 (2021): 7402–10. http://dx.doi.org/10.1016/j.matpr.2020.12.1149.

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KOMIZO, Yu-ichi. "In-situ Microstructure Observation Techniques in Welding". JOURNAL OF THE JAPAN WELDING SOCIETY 77, nr 4 (2008): 290–95. http://dx.doi.org/10.2207/jjws.77.290.

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MATSUI, Hitoshi. "Links of Welding Techniques Experienced by Myself". JOURNAL OF THE JAPAN WELDING SOCIETY 77, nr 7 (2008): 631–34. http://dx.doi.org/10.2207/jjws.77.631.

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Muhlisin, Fadli, Safaruddin H. Al Ikhsan i Fitrah S. Fajar Kusuma. "INVENTORY INFORMATION SYSTEM ON WELDING TECHNIQUES WORKSHOP". Indonesian Journal of Social Research (IJSR) 1, nr 2 (22.04.2020): 73–80. http://dx.doi.org/10.30997/ijsr.v1i2.13.

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In managing laboratory equipment at SMK Negeri 1 Gunungputri, they still use manual methods and the toolman or head of the workshop does not collect data continuously, causing data and goods in the field to be incompatible, then there is no inventory number that causes lost items cannot be identified, therefore needed an Information System Inventory of Welding Engineering Workshop. This system uses the System Development Life Cycle method with Object Oriented Design modeling, with an Information System Inventory Workshop Welding Techniques can make it easier to identify every item in the field, reduce errors in terms of storage of goods, search for data and can facilitate the search for goods, especially in the Engineering workshop Welding.

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Sawicki, Antoni. "Effect of Ultrasonic Techniques on Welding Technologies". Biuletyn Instytutu Spawalnictwa, nr 4 (sierpień 2021): 41–50. http://dx.doi.org/10.17729/ebis.2021.4/5.

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The article discusses selected physical properties of industrial ultrasonic equipment utilising the magnetostrictive or electrostrictive effect. Particular attention was paid to equipment enabling the ultrasonic welding of various metals and thermoplastics. The research involved the comparison of various designs and operation of technological equipment, taking into account selected energy, control and environmental aspects. Based on reference publications it was possible to determine and categorise general features concerning the application of ultrasonic technologies as well as to indicate factors responsible for the formation of imperfections during the ultrasonic welding process.

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Fornaini, C., E. Merigo, P. Vescovi, M. Meleti i S. Nammour. "Laser Welding and Syncristallization Techniques Comparison:In VitroStudy". International Journal of Dentistry 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/720538.

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Background. Laser welding was first reported in 1967 and for many years it has been used in dental laboratories with several advantages versus the conventional technique. Authors described, in previous works, the possibility of using also chair-side Nd : YAG laser device (Fotona Fidelis III,λ=1064 nm) for welding metallic parts of prosthetic appliances directly in the dental office, extra- and also intra-orally. Syncristallisation is a soldering technique based on the creation of an electric arc between two electrodes and used to connect implants to bars intra-orally.Aim. The aim of this study was to compare two different laser welding devices with a soldering machine, all of these used in prosthetic dentistry.Material and Methods. In-lab Nd : YAG laser welding (group A = 12 samples), chair-side Nd : YAG laser welding (group B = 12 samples), and electrowelder (group C = 12 samples) were used. The tests were performed on 36 CrCoMo plates and the analysis consisted in evaluation, by microscopic observation, of the number of fissures in welded areas of groups A and B and in measurement of the welding strength in all the groups. The results were statistically analysed by means of one-way ANOVA and Tukey-Kramer multiple comparison tests.Results. The means and standard deviations for the number of fissures in welded areas were8.12±2.59for group A and5.20±1.38for group B. The difference was statistical significant (P=0.0023at the level 95%). On the other hand, the means and standard deviations for the traction tests were1185.50±288.56 N for group A,896.41±120.84 N for group B, and283.58±84.98 N for group C. The difference was statistical significant (P=0.01at the level 95%).Conclusion. The joint obtained by welding devices had a significant higher strength compared with that obtained by the electrowelder, and the comparison between the two laser devices used demonstrated that the chair-side Nd : YAG, even giving a lower strength to the joints, produced the lowest number of fissures in the welded area.

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Rogante, M. "Neutron techniques for developing engineering welding methods". Welding International 25, nr 10 (październik 2011): 754–61. http://dx.doi.org/10.1080/09507116.2011.581347.

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Vasudevan, M. "Soft Computing Techniques in Stainless Steel Welding". Materials and Manufacturing Processes 24, nr 2 (23.01.2009): 209–18. http://dx.doi.org/10.1080/10426910802612338.

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Li, Zhang, S. L. Gobbi, I. Norris, S. Zolotovsky i K. H. Richter. "Laser welding techniques for titanium alloy sheet". Journal of Materials Processing Technology 65, nr 1-3 (marzec 1997): 203–8. http://dx.doi.org/10.1016/s0924-0136(96)02263-7.

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Węglowski, M. St, S. Błacha i A. Phillips. "Electron beam welding – Techniques and trends – Review". Vacuum 130 (sierpień 2016): 72–92. http://dx.doi.org/10.1016/j.vacuum.2016.05.004.

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Soul, F., M. Ateeg, S. Beshay i M. Senfier. "Residual Stress Correlation in Two Different Mitigation Techniques Using FEA". Advanced Materials Research 83-86 (grudzień 2009): 1254–61. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.1254.

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Many techniques were developed to control residual stress and distortion during welding process to minimizes their magnitude in the affected area. Due to complicity to find qualitative analysis for welding residual stress and distortion in real experiment work, the numerical simulation of welding process give a good solution to helpful the process and evaluated extensive analysis. In the present paper two different residual stress mitigation techniques moving cooling spot and moving heating spot were investigated in thin welded sheet structure using FEA. Thermo mechanical analysis and simulation of the processes were performed by ANSYS. The obtained results show different residual stresses behaviour developed during welding, the residual stress magnitude were minimized in both used techniques especially in trailing heat sink welding process. The out of plane distortion results show successfully eliminating of cambering distortion, it is also found that the effective elimination are based on the proper position parameters with respect to the welding heat source.

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Qi, Wen Jun, Jian Jiang Fang, Yuan Yuan Zhu i Yan Hua Huang. "Computer Aided Calculation of Welding Microstructure and Optimization of Welding Technological Parameters". Advanced Materials Research 33-37 (marzec 2008): 1383–88. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.1383.

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Welding Continuous Cooling Transformation (CCT) graph reflects the relationship between microstructure, hardness of steel heat-affected zone (HAZ), weld and welding cooling rate continuous cooling from high temperature, and it is the basic to select welding material, determine the optimum welding technology, relieve welding cracks and lay down standard of past heat treatment. Welding technological parameters determine welding cooling rate, and the rate determines microstructure, hardness of steel HAZ and weld, therefore we can calculate microstructure according to known welding technological parameters and optimum parameters according to wanted properties based on CCT graph. The system combines CAD and welding techniques, the welding CCT graphs are made into drawing blocks at the platform of AutoCAD, the important data of welding CCT are made into database, they are transferred and managed by Access. Based on Active Automation techniques using Visual Basic, AutoCAD graph base are transferred and data of welding CCT can be inquired and dynamically added to the base. The system has realized the prediction of welding structure and properties and optimizing welding technology.

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Arora, Hitesh, Rupinder Singh i Gurinder Singh Brar. "Thermal and structural modelling of arc welding processes: A literature review". Measurement and Control 52, nr 7-8 (19.06.2019): 955–69. http://dx.doi.org/10.1177/0020294019857747.

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This paper presents a state-of-the-art critical review of the thermal and structural modelling of the arc welding process. During the welding process, high temperature in the welding zone leads to generation of unwanted residual stresses and results in weld distortion. Measurement of the temperature distribution was a key issue and challenge in the past decade. Thermomechanical analysis is among the best-known techniques to simulate and investigate the temperature distribution, welding distortion and residual stresses in the weld zone. The main emphasis of this review is the thermal and structural modelling of welding processes and the measurement of welding residual stresses using different techniques. The study also provides information about the various types of heat sources and models used to predict the weld bead characteristics and thermomechanical analysis for different welding processes such as tungsten inert gas welding, metal inert gas welding and shielded metal arc welding.

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Muhammad, Jawad, Halis Altun i Essam Abo-Serie. "Welding seam profiling techniques based on active vision sensing for intelligent robotic welding". International Journal of Advanced Manufacturing Technology 88, nr 1-4 (21.04.2016): 127–45. http://dx.doi.org/10.1007/s00170-016-8707-0.

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Goriparthi, Veeraiah, Ramanaiah Nallu, Rohinikumar Chebolu, Sudhakar Indupuri i Ramesh Rudrapati. "Experimental Studies on Mechanical Behavior of TIG and Friction Stir Welded AA5083 -AA7075 Dissimilar Aluminum Alloys". Advances in Materials Science and Engineering 2023 (14.04.2023): 1–7. http://dx.doi.org/10.1155/2023/8622525.

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Welding is a suitable and better process to manufacture complex objects for aerospace, naval, and automotive structures. Service conditions and complexity in load acting force the manufactures to make joints between dissimilar materials. Thus, there is a need for efficient welding techniques to form sound joints and an understanding of imperfections and their effects. In this study an attempt has been made to study the joining feasibility of dissimilar aluminum alloys by two different welding techniques, namely, tungsten inert gas welding (TIG) and friction stir welding (FSW). Dissimilar AA5083-O and AA7075-T651 aluminum alloys successfully joined by considered welding techniques. Metallurgical and mechanical characteristics of fabricated weld joints are studied at different weld currents (80–120 amp) for TIG and various rotational speeds (800, 1000, 1100, 1200, and 1400 rpm) with constant traverse speed for FSW. Weld joints made by FSW exhibit superior tensile strength, whereas the joint line microhardness of TIG samples is higher than the FSW ones.

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Tran, Ngoc-Hien, Van-Hung Bui i Van-Thong Hoang. "Development of an Artificial Intelligence-Based System for Predicting Weld Bead Geometry". Applied Sciences 13, nr 7 (27.03.2023): 4232. http://dx.doi.org/10.3390/app13074232.

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The prediction of the weld bead geometry parameters is an important aspect of welding processes due to it is related to the strength of the welded joint. This research focuses on using statistical design techniques and a deep learning neural network to predict the weld bead shape parameters of shielded metal arc welding (SMAW), metal inert gas (MIG), and tungsten inert gas (TIG) welding processes. With the statistical design techniques, experiments were carried out to obtain the data for generating the regression models. Establishing mathematical models that shows the relationship between welding process parameters and weld bead size is significant for practical applications. The mathematical model enables the determination of the weld bead size when setting specific welding process parameters. In this research, experimental research results were obtained to build mathematical models showing the relationship between welding process parameters and weld bead geometries for SMAW, MIG, and TIG welding processes. The research results serve as the basis for establishing predictive systems or optimizing welding process parameters. With deep learning neural network techniques, we developed an artificial intelligence-based system for predicting complicated relations between the welding process parameters and the weld bead size. Both a regression model and the deep learning model result in a good correlation between the welding process parameters and the weld bead geometry.

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Botila, Lia Nicoleta, Ion Aurel Perianu, Gabriela Victoria Mnerie, Emilia Florina Binchiciu, Alexandru Adrian Geana i Matei Marin-Corciu. "Development of the Working Techniques Required to Apply Friction Stir Welding in Liquid Environment". Materials Science Forum 1096 (28.08.2023): 131–41. http://dx.doi.org/10.4028/p-s58zhp.

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Submerged Friction Stir Welding (SFSW) is a topic of international interest, with research aiming at the possibilities of application to a wide range of materials, to achieve better results compared to other welding techniques (e.g. conventional welding, FSW welding in ambient air environment), as well as avoiding overheating of welding tools and welding devices during the welding process.SFSW welding is also a topic of interest within ISIM Timisoara, the paper presenting own contributions to the development of the working technique required for the application of SFSW welding. Variants of technical solutions designed and made by ISIM for the application of the SFSW process are presented, these could be integrated, as appropriate, on the FSW welding machine from the endowment of ISIM, to carry out preliminary experiments of SFSW welding. The preliminary results show that the constructive solutions for the application of liquid working environment to FSW welding are functional and can be used for experimental programs of SFSW welding for different metallic materials.

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Fahmy, M. H., Hamed Abdel-Aleem, M. R. Elkousy i N. M. Abdel-Elraheem. "Comparative Study of Spot Welding and Firiction Stir Spot Welding of Al 2024-T3". Key Engineering Materials 786 (październik 2018): 104–18. http://dx.doi.org/10.4028/www.scientific.net/kem.786.104.

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This investigation is performed to compare the resistance spot welding (RSW) of aluminum alloy (2024-T3) with friction stir spot welding (FSSW) techniques. In this work, parameters of both resistance spot welding (RSW) and friction stir spot welding (FSSW) techniques were optimized and the optimum welding variables for both techniques were obtained. For FSSW, the tensile shear strength increased with increasing probe length, tool rotational speed and tool holding time. Tensile shear force value of RSW is about 66% of that of FSSW. This is explained by the coarse dendritic structure in resistance spot welding compared to the plastically deformed stir zone and heat affected zone in FSSW. The ratio of nugget shear strength of RSW and FSSW to base metal is about 71% and 149% respectively. The maximum hardness was obtained in stir zone at the surface of the tool. Very fine grain size of about 4 microns was obtained in stir zone followed by elongated and rotated grains in TMAZ where dynamic recrystallization did not occur.

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Goyal, Ashish, Hardik Kapoor, Lade Jayahari, Kuldeep K. Saxena, N. Ummal Salmaan i Kahtan A. Mohammed. "Experimental Investigation to Analyze the Mechanical and Microstructure Properties of 310 SS Performed by TIG Welding". Advances in Materials Science and Engineering 2022 (21.08.2022): 1–11. http://dx.doi.org/10.1155/2022/1231843.

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In present experimental work, 310 SS alloy has been welded by the TIG welding using design of experiment and grey relation optimization techniques. The input parameters, i.e., welding current, welding gas flow rate, and welding voltage, have been selected to perform the TIG welding. The same filler material was used during the welding process to investigate the mechanical and microstructure properties. The design of experiment and grey relation optimization techniques were used to optimize the effect on hardness and tensile strength of the welded joints. The experiments were performed as per the L9 orthogonal array obtained by the design of experiment methodology. The 65 A, 12 V, and 7.5 gas flow rate optimum setting of input parameters provides the better results for the effective hardness and tensile strength. The most significant parameters, i.e., welding current with 84.93% and welding voltage with 65.09%, were obtained for hardness and tensile strength, respectively.

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Sas, Illés, i János Lukács. "Post-Treatment of Welding Joints of High Strength Steels II.:Improving Residual Stress Condition – Overview". Multidiszciplináris tudományok 12, nr 2 (2022): 25–43. http://dx.doi.org/10.35925/j.multi.2022.2.3.

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High strength steel welding joints fatigue strength could be improved by changing the as weld condition with post-weld treatment. These post-weld treatments are classified to two categories which are the weld geometry and residual stress condition improvement methods. Post-weld treatment methods of high strength steel welding joints by improving weld geometry were overviewed in the first part of our article. The post-weld treatment methods for improving the welding joint residual stress condition are also applicable in high strength steels, but some consideration have to take in place when applying these techniques. The aim of this paper to review the welding joint residual stress condition improvement techniques considers application of these techniques in high strength steels.

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Mir Sadat, Ali, i Rao Ch. Srinivasa. "An Experimental Investigation into Different Distortion Control Techniques in Welded T-Joints". Applied Mechanics and Materials 660 (październik 2014): 114–19. http://dx.doi.org/10.4028/www.scientific.net/amm.660.114.

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Welding is a reliable and effective metal fabrication process which is widely used in industries. Localized heating during welding, followed by rapid cooling generates residual stress and distortion in the weld and base metal. In the last few decades various research efforts have been directed towards the control of welding process parameters aiming at reducing the residual stress and distortion. In the present paper the distortion in fillet welds and the affect of the distortion control techniques on the welded joint are studied. The welding is done with different process parameetrs and under different surrounding conditions. Due to this the distortion level in the T Joint was measured and observed. The study is necessarily aimed at developing the prediction and controlling techniques for distortion in welded T-joints. Key Words: Distortion, preheating, peening, leg length, Shielded metal arc welding (SMAW), Manual metal-arc welding (MMAW)

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Li, Fa Gen, Xun Ji Li, Wei Wei Li, Xian Ming Li, Ze Liang Chang i Quan Feng. "Study on Welding Techniques of 316L Lined Bimetallic Pipe". Materials Science Forum 944 (styczeń 2019): 944–49. http://dx.doi.org/10.4028/www.scientific.net/msf.944.944.

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It is well known that welding technique was often a knotty problem for bimetallic lined steel pipes to use widely. A number of failures in secession of weld cracking and weld corrosion had been observed in oil fields in recent years, which seriously disrupted the order of oil and gas production. To solve welding problems of 316L bimetallic lined pipes, works outcome about failure analysis and welding process research were presented in this paper. Failure analysis results confirmed that Welding defects, high hardness regions was the main reasons about failure problems of weld crack while structure design defects of seal weld and bad back-protection effects of flux-cored wire resulted in weld corrosion. Welding defects in the regions of seal weld became the failure source while the high hardness both in the region of seal weld and weld joint formed the crack propagation channel, and therefore both initially contributed to weld cracking. Additionally owing to the structure design of seal weld, liner layer would be heated over and over again during the period of seal weld and then it was not enough to protect CRA layers from being damaged during the period of girth weld. As a result the corrosion resistance in the welding area was reduced to become a weak area. On the basis of failure analysis, further research work was carried out to improve welding performance. Seal weld structure and girth weld process was improved. The difference of welding wires and welding process was analyzed, and their defects were described separately. Results showed that the welding performance welding by ERNiCrMo-3 and supporting technology was more reliable than ATS-F309L and supporting technology, whether seal weld or butt welding. The distribution and value of the hardness could be effectively controlled; Moreover, corrosion resistance performance was also better. Therefore, the seal weld and girth weld conducted by ERNiCrMo-3 and supporting technology was feasible.

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Piekarska, Wiesława, Zbigniew Saternus, Milan Sapieta i Peter Kopas. "The influence of joining technique on the deformation of laser welded T-joints". MATEC Web of Conferences 254 (2019): 02011. http://dx.doi.org/10.1051/matecconf/201925402011.

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T-joints are often used in large-scale welded constructions. The use of a laser beam for welding allows to create joints using various techniques. Used welding method affects the shape and size of heat affected zone, deformation of welded elements and consequently the quality of the joint. This work concerns the numerical modeling of the size of heat affected zone and welding deformations in T-joint obtained with two different welding techniques: single-side fillet T-joint and butt welded T-joint, called I-core welded joint. Numerical simulations are carried out in the commercial Abaqus FEA software, supplemented by an additional numerical subroutines which enabled the analysis of thermomechanical phenomena occurring in welding process. Mathematical model of a moveable welding source and the description of heat source positioning relative to the edges of the connected elements are described in numerical subroutines. The material parameters of austenitic steel are taken into account. The size of deformations of welded joints are determined as well as the influence of two different joininig techniques of T-joint on the amount of generated welding deformations are analyzed and compared.

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Yu, Li Na, Kazuyoshi Saida, Masahito Mochizuki, Masashi Kameyama, Takehiko Sera, Shinro Hirano i Kazutoshi Nishimoto. "Hardness Prediction for Temper Bead Welding of Non-Consistent Layer Technique". Materials Science Forum 783-786 (maj 2014): 2851–56. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2851.

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Temper bead welding (TBW) is one effective repair welding method for the large-scale nuclear power plants. Consistent Layer (CSL) technique is the theoretically most authoritative method among the five temper bead welding techniques. However in the actual operation, CSL technique is difficult to perform, and non-CSL techniques (Controlled Deposition technique, Half Bead technique, et al) are mainly used in the actual repair process. The thermal cycles in heat affect zone (HAZ) of non-CSL technique are more complicated than that of CSL techniques. Through simplifying the complicated thermal cycles to 4 types of thermal cycles, the neural network-based hardness prediction system for non-CSL techniques has been constructed. The hardness distribution in HAZ of non-CSL techniques was calculated based on the thermal cycles numerically obtained by finite element method (FEM). The predicted hardness was in good accordance with the experimental results. It follows that the thermal cycle simplification methods are effective for estimating the tempering effect during temper bead welding of non-CSL techniques.

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Aydin, S., U. Taskin, B. Altas, M. Erdil, T. Senturk, S. Celebi i M. F. Oktay. "Post-tonsillectomy morbidities: randomised, prospective controlled clinical trial of cold dissection versus thermal welding tonsillectomy". Journal of Laryngology & Otology 128, nr 2 (luty 2014): 163–65. http://dx.doi.org/10.1017/s0022215113003253.

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AbstractBackground:New surgical techniques and devices have been described that decrease post-tonsillectomy morbidities. This study aimed to compare the two most popular tonsillectomy techniques.Method:Forty children underwent tonsillectomies using both the thermal welding and cold dissection techniques. In each patient, one side was removed with thermal welding and the other was removed with cold dissection.Results:There was a significant decrease in intra-operative blood loss, and the mean operation time was significantly lower on the thermal welding side compared with the cold dissection side. On the cold dissection side, tissue healing (i.e. the rate of complete tissue healing) was better and less pain was reported compared with the thermal welding side. However, there were no significant differences between the two techniques in terms of throat pain scores on the 1st, 3rd or 14th day post-operatively, or tissue healing scores on any of the post-operative days assessed.Conclusion:Cold dissection resulted in better tissue healing and lower pain scores than thermal welding, but thermal welding was associated with less intra-operative blood loss and lower mean operation time than cold dissection.

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SUGINO, Hiroki. "Making Better Cars by Using Laser Welding Techniques". JOURNAL OF THE JAPAN WELDING SOCIETY 89, nr 1 (2020): 45–50. http://dx.doi.org/10.2207/jjws.89.45.

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Syed Aqib Ali et al.,, Syed Aqib Ali et al ,. "Acceptance of Various Welding Techniques for Dissimilar Metals". International Journal of Mechanical and Production Engineering Research and Development 10, nr 3 (2020): 2367–74. http://dx.doi.org/10.24247/ijmperdjun2020220.

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Eduardo Gilabert, Saulo Cruz, i Aitor Arnaiz. "Welding Process Quality Improvement with Machine Learning Techniques". IFAC-PapersOnLine 54, nr 1 (2021): 343–48. http://dx.doi.org/10.1016/j.ifacol.2021.08.039.

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KARABULUT, Gizem, i Nuray BEKÖZ ÜLLEN. "A Review on Welding Techniques of Metallic Foams". Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi 15, nr 1 (27.03.2022): 217–32. http://dx.doi.org/10.18185/erzifbed.997743.

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Hua, Liang, Yujian Qiang, Ling Chen, Juan Yao, Feipeng Liu i Juping Gu. "Key Image Processing Techniques Used in Laser Welding". Journal of Robotics and Mechatronics 27, nr 1 (20.02.2015): 24–31. http://dx.doi.org/10.20965/jrm.2015.p0024.

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<div class=""abs_img""><img src=""[disp_template_path]/JRM/abst-image/00270001/03.jpg"" width=""500"" /> Welding image and weld pool edge</div> Machine vision techniques are widely used with automatic laser-welding robots. Existing systems acquire geometrical information on both the weld seams and molten pool by using a single camera and then processing a single image. The recognition of weld seams is thus obviously affected by the arc, plasma, spatter, etc. This study examined a novel, cost-effective weld image acquisition and processing system with real-time performance, which is based on an advanced RISC machine (ARM). The software and hardware platforms of a weld seam image processing system were designed, and theoretical and experimental studies were undertaken. A novel image-processing method for the laser welding molten pool, based on a quaternion and self-organizing feature map (SOFM) neural network is also proposed. The edge characteristic vector of the molten pool is acquired based on the rotational characteristic of the quaternion in a three-dimensional vector space. The geometric features of the molten pool image are acquired by the self-organizing feature map neural network. The measured results pointed to the possibility of improving the reliability and precision of the automatic laser welding system by combining the two machine vision systems. </span>

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Jones, I. A. "Techniques For Welding Polymeric Devices Using Laser Sources". Materials Technology 20, nr 2 (styczeń 2005): 76–78. http://dx.doi.org/10.1080/10667857.2005.11753114.

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Korolkov, Oleg, Toomas Rang, A. Syrkin i V. Dmitriev. "Diffusion Welding Techniques for Power SiC Schottky Packaging". Materials Science Forum 527-529 (październik 2006): 919–22. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.919.

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This paper is devoted to the results of a diffusion welding technique applied to solve the problem of packaging for large area SiC Schottky diodes. To supply low defect density substrates for fabrication of 0.3 cm2 Schottky diodes TDI defect-reducing technology was used. Diodes were fabricated on CVD grown low-doped 4H-SiC single epitaxial layer without edge termination. Double layer Ni-Au and triple layer Ti-Ni-Au sputter metallization were used for Schottky contacts fabrication. Non-rectifying backside contacts were provided by Ni-Au metallization. Diodes were tested on-wafer and delivered for dicing, and packaging. To decrease the parasitic spreading resistance the thickness of initial sputter metallization was increased by diffusion welded 30 μm metal foil. Combined thick and plane metal layers make it possible to perform the clamp mode package used in power electronics. This scheme of packaging ensures current takeoff from the whole contact area and allows operating temperatures up to 600°C. The forward current-voltage characteristics measured at 75 A measured for packaged diodes yields 250 A/cm2 (70A) at 1.9 V forward voltage. Reverse recovery time for packaged diodes was in the range of 29-36 ns.

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Oikawa, H., i T. Saitoh. "New resistance welding techniques for steel and aluminium". Welding International 7, nr 10 (styczeń 1993): 820–27. http://dx.doi.org/10.1080/09507119309548500.

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Kang, Hyungseok, Gi-Ra Yi, Young Jun Kim i Jeong Ho Cho. "Junction Welding Techniques for Metal Nanowire Network Electrodes". Macromolecular Research 26, nr 12 (grudzień 2018): 1066–73. http://dx.doi.org/10.1007/s13233-018-6150-9.

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