I recently got my first welder. I have formed a couple of fenders for a trailer I'm refurbishing and need to weld a "half moon" shaped piece into the curve. Reading the manual, it says to use .030 aluminum wire with pure argon gas, so my question is:
Do I HAVE to use pure argon gas ? It seems that it is only used for aluminum and this is probably the only aluminum welding I'll attempt.. the problem being that I don't have a cylinder yet and for the smaller one, to buy, filled with argon, they want nearly $ 300.00
What would happen if I tried to weld the fenders WITHOUT ANY gas ? I dont care how "pretty" the results would be..the weld will be on the "inside" of the fender, mainly behind the wheel/tire.
OR, what about using the normal available AR 80% CO2 20% (or whatever they have) for regular steel MIG welding ?
Just trying to avoid having to get TWO bottles.