If the two pieces that I want to join are different thicknesses, which material thickness do I set my FCAW machine on? I want good penetration on the thicker one but don't want to blow through the other.

Helpful! Thanks!

I guess not?

Also, can someone explain what all that stuff on the sticker means?

I have this new Arksen FCAW (cheap) with switches labeled Min/Max and 1/2. I know Min-1 is lowest and Max-2 is highest but I don't know the volt/amp per setting. Attached is the pic on the welder. It appears the Min-1 setting is 17V and the Max-2 setting is 20V. What is confusing is one section says...