Quote Originally Posted by Stu Miles View Post
If machine only does 1/8 inch penetration on aluminum,
and lets say I am welding 1/4 inch aluminum plate.
I do one side and flip it over -
is that doing the same thing as one pass with a machine rated for 1/4 inch alum ?

Thanks, Stu
I am curious as to what machine you are thinking gets 1/8 inch penetration on aluminum cause for $1000 you are not going to get a machine that even comes close to that.

And when the size of a fillet weld is measured, it is measured from the leg to the toe and the effective throat is what actually means anything.

I think you may be misunderstanding the ratings for these machines. When they say 1/4 inch, that means that is the max. thickness of base metal for a single pass weld.