Arc Welding Process - GMAW
Gas metal arc welding uses an arc between a constant filler metal (consumable) electrode and the weld pool. Shielding is provided by an externally supplied shielding gas. This method is also known as MIG welding or MAG welding. MIG (Metal Inert Gas) welding is defined as the use of an inert (i.e. non active) gas. MAG (Metal Active Gas) welding involves the use of an active gas (i.e. carbon dioxide and oxygen). CO 2 is a more frequently used shortening of MAG welding gas.
Gas metal arc welding consists of a DC arc burning between a thin bare metal wire electrode and the workpiece. The arc and weld area are encased in a protective gas shield. The wire electrode is fed from a spool, through a welding torch which is connected to the positive terminal into the weld zone. Gas metal arc welding is the most widely used process in the world today. GMAW is a versatile method which offers a lot of advantages. The technique is easy to use and there is no need for slag-cleaning. Another advantage is the extremely high productivity that Gas Metal Arc Welding makes possible.
Gas metal arc welding is used on all thicknesses of steels, aluminum, nickel, stainless steels etc. The MAG process of GMAW is suitable both for steel and unalloyed, low-alloy and high-alloy based materials. The MIG process of GMAW, on the other hand, is used for welding aluminum and copper materials.
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