Welding Aid Tri-Pak
Product Review (submitted on January 13, 2014):
These are stupidly-AWESOME! Absolutely prevents blow-through using both TIG and MIG. "Heavy" bars are bendable and can be formed to gentle shapes. Works so well that I almost feel bad about panning Eastwood's Tig200, because not-only do these bars prevent blow-through, but they also protect the back-side of the metal during TIG, preventing oxygen from getting into the weld puddle (and the Tig's arc won't dive-down through sheetmetal butt-joints). I could probably do my own backing with a piece of 3/4" copper-pipe smashed-flat, but I'm thrilled with these.