Gas metal arc (MIG)
Joining: welding, fusion, arc
Gas metal arc (MIG) welding is a heavy-duty welding processes (together with MMA and TIG). Theelectrode here is a bare wire, with no flux. The flux is replaced by a stream of inert gas, which surrounds the arc formed between the consumable wire electrode and the component; the wire is advancedfrom a coil as the electrode is consumed. The real advantages over torch welding are that there is no flux or slag, giving a cleaner weld - and that it can be automated. But there is a penalty:because the process needs gas, it is more expensive and less portable. None the less, MIG is considered to be the most versatile of all arc welding processes, allowing the welding of most ferrous andnon-ferrous alloys in a wide range of thicknesses and all welding positions.
Materials to be joined
Scarf TrueTee True
Range of section thickness 1 - 12 mmTolerance 0.8 - 5 mm
Accessibility by one side True
Electrically conductive True
Thermally conductive True
Set-up time 0.3 - 1 hr
Time before handling 100 - 1e3 s
Relative equipment costing 3 - 10
Labor intensity low
Capital cost4.71e3 - 4.71e4 USD
Tooling cost 377 - 1.89e3 USD
If you want high quality welds in aluminum, magnesium, titanium, stainless steel or even mild steel,MIG welding is the process to choose. It is best for fillet welds though an adaptation - MIG spot welding - and lends itself well to lap joints. Distortion by thermal expansion is minimized by...
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