Can you firmly attach a heatsink to the back side of the area to be welded? A copper or aluminum block clamped to the panel? Expect some HAZ coloration, but this could be scrubbed afterwards Just an idea anyway. Oh, and welcome to the forum! Trev mmmmmm that's true, i like that....i'll have to do s...

So, i've got a project i'm about to start working on with a friend, involving some 16ga 304 stainless. The key is, i'm going to be doing some welds on the inside, that i DONT want visible on the backside. No 100% penetration wanted. My welder is a Northern Tool 115v inverter, 80a max, goes down to 2...