Best Gas For Mig Welding Car Body. The answer is normal. CO2 is much cheaper than inert gas and it allows the bond to penetrate.
100 Carbon Dioxide is widely available and is the cheapest gas to purchase at the welding supply store. It is better to use instead of a high percentage of CO2. He said to strictly stay with 75 C0225 argon.
Its used frequently in MIG welding often on its own 100 CO2 or as a small percentage of a helium or argon gas mix.
I was asking the local Miller dealer what was the best gas mix to use when welding on car parts and pieces. A lot of people rave about the portamigs ability to weld at 20 amps especially on car panels but at the same time other people say that 30 amps is ideal for car work. He said to strictly stay with 75 C0225 argon. An undercut is a small groove at the top of a weld bead that was cut into the parent metal due to inconsistent travel speed or high voltage.