HOT ROD Staff Writer Jun 23, 2017. See All 24 Photos. Last month, in the first of our four-part series, we covered gas welding. ... We're welding sheetmetal here. The angle of the gun, ...

Most automotive MIG welding utilizes a gas shield, most commonly CO2, or C-25 (25 percent CO2 and 75 percent Argon). C-25 gas reduces weld spatter significantly, and produces the best-looking weld ...