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Welding Technology-MIG welding Guide

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Gas metal arc welding (GMAW) is also called MIG (metal inert gas) if the shielding gas is inert, for example, argon, or MAG (metal active gas) if the gas has a content of an active gas such as CO2. In Europe, the process is usually called MIG/MAG or just MIG welding. The process is used in a wide range of plate thicknesses even though it has been most dominant in thin sheet welding. This is because of its easiness in starting and stopping and thereby its relatively high productivity. Compared to stick electrode (MMA) welding there is no need for the frequent electrode changes and slag removal. The principle of MIG welding is that a metallic wire is fed through the welding gun and melted in an arc. The wire serves the dual purpose of acting as the current-carrying electrode and as the weld metal filler wire. Electrical energy for the arc is supplied by a welding power source. The arc and the pool of molten material are protected by a shielding gas, which is either inert or active. In this context, an inert gas is one that does not react with the molten material. Examples of gases in this category are argon and helium. Active gases, on the other hand, participate in the processes in the arc and the molten material. Argon containing a small proportion of carbon dioxide or oxygen is an example of an active gas.

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MIG welding
guide



Edited by Klas Weman and Gunnar Lindén

,MIG welding guide

,Related titles:

New developments in advanced welding
(ISBN-13: 978-1-85573-970-3; ISBN-10: 1-85573-970-4)
Recent developments in high-technology areas have significantly transformed the
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Cumulative damage of welded joints
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Fatigue is a mechanism of failure that involves the formation of cracks under the action of
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loading is such that fatigue may be a possibility and to design the structure with inherent
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Details of these and other Woodhead Publishing materials books and journals, as well as
materials books from Maney Publishing, can be obtained by:
· visiting our web site at www.woodheadpublishing.com
· contacting Customer Services (e-mail: ; fax: +44 (0)
1223 893694; tel.: +44 (0) 1223 891358 ext. 30; address: Woodhead Publishing
Limited, Abington Hall, Abington, Cambridge CB1 6AH, England)
If you would like to receive information on forthcoming titles, please send your address
details to: Francis Dodds (address, tel. and fax as above; email: francisd@woodhead-
publishing.com). Please confirm which subject areas you are interested in.
Maney currently publishes 16 peer-reviewed materials science and engineering journals.
For further information visit www.maney.co.uk/journals.

, MIG welding guide
Edited by
Klas Weman and Gunnar LindeÂn




Woodhead Publishing and Maney Publishing
on behalf of
The Institute of Materials, Minerals & Mining


CRC Press
Boca Raton Boston New York Washington, DC

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