/diy/ - Do It Yourself

I'm studying as a welder, and I'm trying to make the MIG cert. it requires vertical down welding into a corner >< (on 1/16th inch stainless)

I've got the vertical down bit, but when I have to twist the gun such that I'm angled down into the corner I always punch out the back of the plate or don't get the penetration I need. any tips?