the photo below shows 1 inch thick plates of aisi 1010 steel welded to square tubing using short circuit mig watch video on modular fixturing used to fabricate this part
The picture below is a cross sectioned mig weld welded way too cold. The weld metal did not penetrate thru the hot rolled mill scale. This weld was done at 17 volts and about 180 ipm using .035 er70s6 bare wire with 75/25 ar/co2
spatter, cold lap, wire whiskers, ...dang...anything else?