it depends on the metel that you plan to weld, tig is for aluminum, Arc is for slightly thicker metels from about 14guage up, not sheet metel. mig is the most common for our vehicles , it is good for nice looking beads on exaust or rollcages. It also works great on thinner guages of metal because you can turn the heat down so low and still get good penatration. Oxy acteline, or gas welding is great for thin metal and precision welds, also for brazing. and with the right tips can be used in cutting and bending metal.
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