Welding Methods for Chassis

[Wynand]

Originally Posted by Enoch

Hi Acra, I found between 90 and 120 amps suited most jobs - that was what it showed on my dial anyway, not sure how accurate that is. I went up to about 130-140 for the rear uprights,.... (Dave)

Actually, the electrode size determine the current to be used.
A rule of thumb method is to multiply the diameter of the electrode with 40 example; 2.5mm (12#) x 40 = 100amps or lets say 3.15mm (10#) x 40 = 125amps.
If you weld vertically, it is best to drop the amperage a bit or use broken arc technique (my preference).

The above method is only applicable to AC or DC arc welding and not mig/tig.