![]() The solution is to create a “shield” around the weld area while it's being formed. Nitrogen, oxygen, and other things in the air we breathe contaminate the process. Unfortunately, there's a basic problem with this kind of welding. To prevent the person doing the welding from receiving a powerful electric shock, an earth clip must be connected to a ground point. The wire becomes a “puddle” of molten metal, thus creating the weld. The wire is fed automatically by pressing the trigger on a handheld gun. In a MIG welder, one of these electrodes is the metal you are welding, and the other is a spool of metal wire. This short circuit, or arc, can be anywhere from 5,000° F to 40,000° F, so it melts metal very effectively. How MIG welders workĪ MIG (metal inert gas) welder is a kind of arc welder, and all arc welders use the same basic principle: an electrical current is passed between two electrodes, causing a short circuit across the gap between them. However, MIG is the common expression and the one most professionals use.
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