Manual Metal Arc Welding and Gas Metal Arc Welding

Document Type

Article

Publication Date

1-1-2014

Abstract

Welding is a joining process that is being applied to an ever-widening range of fabrication activities, from inland, underground, underwater to outerspace in transportation, manufacturing, construction and mining, marine and ship-building, oil and gas pipelines, offshore structures, and nuclear structures, etc. In pipeline construction and offshore structures, welding is essential. Welding is a complex process with successful outcomes dependent on a range of input parameters. Often the physical properties of welded joints are critical to structural integrity. Thermal problems which are associated with welding are intrinsic and they include: induced postweld residual stress and distortion; and altered microstructural properties, which stem from the intense localized nonuniform heating and cooling, applied to the materials during the welding process. Traditionally management of welding processes has been achieved by experimental, trial and error approaches but increasingly computer simulation tools have been applied. Refined numerical tools are the ideal way to test process variations, such as weld procedure or preheat conditions; and these may ultimately become the 'virtual' welding machine. Mathematical simulation of welding and related phenomena is termed computational weld mechanics which is, now, an established and growing field of research endeavor; and one that is significant in international welding research. In this chapter some very basics of manual metal arc and gas metal arc welding processes are discussed briefly, and these two processes are used very heavily by all fabrication industries. © 2014 Elsevier Ltd All rights reserved.

Publication Source (Journal or Book title)

Comprehensive Materials Processing

First Page

49

Last Page

76

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