Pulsed Current Arc Welding Processes
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Pulsed Current Arc Welding Processes
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Author : J. J. Vagi
language : en
Publisher:
Release Date : 1970
Pulsed Current Arc Welding Processes written by J. J. Vagi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Electric welding categories.
Pulsed-current is used primarily with the gas tungsten-arc and gas metal-arc welding processes and, to a limited degree, with plasma-arc welding. The pulsed-current arc welding processes employ two levels of welding current instead of the single level that is used conventionally. Welding current is, in effect, switched between a high and a low level to produce a 'pulsating' current or welding arc. Pulsed-current processes offer important advantages, including, among others, improved control of welding heat input rates, reduced distortion of the parts during welding, improved weld quality, and improved control of weld metal deposition in all welding positions. Pulsed-current gas tungsten-arc (PC-GTA) and pulsed-current gas metal-arc (PC-GMA) welding processes have been used for joining a variety of materials, including some that are often considered difficult-to-weld materials. The memorandum reviews the available literature that has been published on pulsed-current arc welding processes. In addition, information was obtained from numerous representatives of pulsed-current equipment manufacturers and users. (Author).
Pulsed Arc Welding
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Author : J A Street
language : en
Publisher: Elsevier
Release Date : 1990-08-31
Pulsed Arc Welding written by J A Street and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-08-31 with Technology & Engineering categories.
Various forms of thermal pulsing in TIG and MIG welding, and droplet pulsing in the MIG process, are described in detail. The author also discusses some disadvantages of pulsing in order to stress the importance of choosing an appropriate level of technology to fulfil a given requirement.
Tig And Plasma Welding
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Author : W Lucas
language : en
Publisher: Woodhead Publishing
Release Date : 1990-10-31
Tig And Plasma Welding written by W Lucas and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-10-31 with Technology & Engineering categories.
This book provides designers, welding engineers and metallurgists with the essential information for understanding the welding operation and for applying the processes in production. The fundamental electrical, arc and process characteristics are described for various operating modes, including current, micro-TIG, TIG hot wire, narrow gap TIG and keyhole plasma.
Pulse Current Gas Metal Arc Welding
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Author : Prakriti Kumar Ghosh
language : en
Publisher: Springer
Release Date : 2017-04-05
Pulse Current Gas Metal Arc Welding written by Prakriti Kumar Ghosh and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-05 with Technology & Engineering categories.
This monograph is a first-of-its-kind compilation on high deposition pulse current GMAW process. The nine chapters of this monograph may serve as a comprehensive knowledge tool to use advanced welding engineering in prospective applications. The contents of this book will prove useful to the shop floor welding engineer in handling this otherwise critical welding process with confidence. It will also serve to inspire researchers to think critically on more versatile applications of the unique nature of pulse current in GMAW process to develop cutting edge welding technology.
Key Technologies Of Intelligentized Welding Manufacturing
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Author : Yiming Huang
language : en
Publisher: Springer
Release Date : 2019-04-30
Key Technologies Of Intelligentized Welding Manufacturing written by Yiming Huang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-30 with Technology & Engineering categories.
This book presents the recent research results of the application of arc spectrum in the welding process. It sheds light on the fundamentals of monitoring welding quality using arc spectral information. By analyzing the topic both from a global and local perspective, it establishes a knowledge base of features characterizing welding statuses. Researchers, scientists and engineers in the field of intelligent welding can benefit from the book. As such, this book provides valuable knowledge, useful methods, and practical algorithms that are applicable in real-time detection of welding defects.
The Use Of Pulsed Current To Control The Weld Profile And Metal Transfer In The Submerged Arc Welding Process
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Author : O. A. A. Ismail
language : en
Publisher:
Release Date : 1982
The Use Of Pulsed Current To Control The Weld Profile And Metal Transfer In The Submerged Arc Welding Process written by O. A. A. Ismail and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Welding Processes
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Author : Peter Thomas Houldcroft
language : en
Publisher: CUP Archive
Release Date : 1967-10-02
Welding Processes written by Peter Thomas Houldcroft and has been published by CUP Archive this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967-10-02 with Technology & Engineering categories.
Influence Of Current Pulse Profile On Metal Transfer In Pulsed Gas Metal Arc Welding
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Author : Emanuel Bruno Ferreira dos Santos
language : en
Publisher:
Release Date : 2017
Influence Of Current Pulse Profile On Metal Transfer In Pulsed Gas Metal Arc Welding written by Emanuel Bruno Ferreira dos Santos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Gas metal arc welding categories.
The increase in the requirements of safety and reliability demanded from the normalization institutes by the issue of normalizing standards, led to the need of the development of materials of superior properties. Owing to the development of metallurgy, the development of materials with extremely high values of strength and toughness was made possible. However, employing these materials in industrial applications is limited by the deterioration of their properties after the material is processed using techniques such as welding. To cope with this challenge, several welding process have been developed. One of these processes is the pulse gas metal arc welding (GMAW-P), in which the arc current is periodically pulsed in order to achieve metal transfer and effectively join the material being dealt with, and this decrease the energy input to the base metal. Due to the advance of electronics and transistor technology there are a large number of current pulse profiles commercially available, with different degrees of complexity, designed for specific applications. Determining the balance between the complexity and benefits for the various pulse profiles and process modifications available is the main motivation for the research presented in this thesis. Specifically, the metal transfer of two commercially available current profiles was studied using high-speed imaging and high speed data acquisition of the electrical signal during welding, for different welding conditions. The results showed that the mode of metal transfer differs for the investigated profiles and that for the same pulse profile, as the pulse parameters are modified the metal and heat transfer changes, altering weld bead features such cross-sectional area and penetration.
Process Control And Development In Wire And Arc Additive Manufacturing
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Author : P. M. Sequeira Almeida
language : en
Publisher:
Release Date : 2012
Process Control And Development In Wire And Arc Additive Manufacturing written by P. M. Sequeira Almeida and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
This thesis describes advancements in the modelling, optimisation, process control and mechanical performance of novel high deposition rate gas metal arc welding processes for large scale additive manufacturing applications. One of the main objectives of this study was to develop fundamental understanding of the mechanisms involved during processing with particular focus on single layer welds made of carbon steel using both pulsed-current gas metal arc welding and cold metal transfer processes. The effects of interactions between critical welding process variables and weld bead and plate fusion characteristics are studied for single and multi-layers. It was shown that several bead and plate fusion characteristics are strongly affected by the contact tip to work distance, TRIM, wire feed speed, wire feed speed to travel speed ratio, and wire diameter in pulsed-current gas metal arc welding. The arc-length control, dynamic correction and the contact tip to work distance are shown to strongly influence the weld bead geometry in the cold metal transfer process. This fundamental knowledge was essential to ensure the successful development of predictive interaction models capable of determining the weld bead geometry from the welding process parameters. The models were developed using the least-squares analysis and multiple linear regression method. The gas tungsten constricted arc welding process was utilised for the first time for out-of-chamber fabrication of a large scale and high-quality Ti-6Al-4V component. The main focus was, however, in the use of the cold metal transfer process for improving out-of-chamber deposition of Ti-6Al-4V at much higher deposition rates. The effect of the cold metal transfer process on the grain refinement features in the fusion zone of single layer welds under different torch gas shielding conditions was investigated. It was shown that significant grain refinement occurs with increasing helium content. The morphological features and static mechanical performance of the resulting multi-layered Ti-6Al-4V walls were also examined and compared with those in gas tungsten constricted arc welding. The results show that a considerable improvement in static tensile properties is obtained in both testing directions with cold metal transfer over gas tungsten constricted arc welding. It was suggested that this improvement in the mechanical behaviour could be due to the formation of more fine-grained structures,which are therefore more isotropic. The average ultimate tensile strength and yield strength of the as-deposited Ti-6Al-4V material processed via cold metal transfer meet the minima specification values recommended for most Ti-6Al-4V products. Neutron diffraction technique was used to establish the effect of repeated thermo-mechanical cycling on the generation, evolution and distribution of residual stresses during wire and arc additive manufacturing. The results show a significant redistribution of longitudinal residual stresses along both the substrate and multi-bead with repeated deposition. However, a nearly complete relaxation occurs along the built, once the base plate constraint is removed.
Process Pipe And Tube Welding
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Author : W Lucas
language : en
Publisher: Elsevier
Release Date : 1991-05-31
Process Pipe And Tube Welding written by W Lucas and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-05-31 with Technology & Engineering categories.
The welding of tubes is an essential requirement in the fabrication of components in many industries. The original idea for this book came from a seminar organized by The Welding Institute which attracted over 100 specialists concerned with design, fabrication, production and quality assurance and yielded a number of valuable papers. "Process Pipe and Tube Welding" contains some of these papers together with additional chapters to provide comprehensive coverage of all aspects of tube welding from initial design considerations through production to final inspection. In the first three chapters the authors outline the process and equipment options available for both manual and mechanized welding. This is essential for design and production planning when faced with the choice of competing processes such as MMA, MIG, TIG or plasma, helping engineers make the right choice for particular applications and ensuring the most cost effective welding techniques are employed. Five further chapters are devoted to the application of tube welding in the aero-engine, ship building, power generation, petrochemical and chemical plant industries with numerous details on processes, materials, techniques and equipment. The welding parameters and production data provided by the authors are a valuable source of information and will help engineers to overcome problems in production.This title includes Process options and manual techniques for welding pipework fabrications; Mechanised arc welding process options for pipework fabrications; Process techniques and equipment for mechanised TIG welding of tubes; Welding pipes for aero-engines; TIG welding pipework for ships; Automatic tube welding in boiler fabrication; TIG and MIG welding developments for fabrication of plant for the chemical, petrochemical, and offshore oil and gas industries; Fabrication of aluminium process pipework; A fabrication system for site mechanical construction; Qualification of welding procedures for the chemical process industry; Non-destructive examination of welds in small diameter pipes.