I'm just doing the second welding. Our doors are generally 50 thick sweaty iron plates. If you want to know how to adjust the current and voltage, you'd better have a numerical value.

Let's just say that the welding current and voltage are generally fixed, and generally have little to do with the thickness of the plate.

Your 50 thick plate is not welded at one time, but multi-layer and multi-pass welding. Generally speaking, different welding positions require different currents and voltages. The specific welding current and welding voltage also vary from person to person. Generally, the current is 240A and the voltage is about 30 V when welding flat. When welding vertically, the current is about 180A.