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I'm no expert at welding, but I do know a tiny bit about it. The general theory behind it is to heat the metal up enough so that it melts into one piece. This is usually accomplished usinng an electic spark to heat the area up. A problem arises with heating metals so fast, because they will rust real fast. So a gas like nitrogen is used to to keep the oxygen away from the welding parts. It kind of envelops the feed wire while youre welding. TIG and MIG welding is titanium inert gas and metal inert gas(usually steel).
I don't have much experience with body work, or any specific type of welders, but I decided to contribute what I know. Hope it helps.
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