Bit of a silly question I know, but can you? Always used a Clarke en90 on thin sheet and body work, but after laying some runs on 2mm on top of 2mm I'm only getting 'burn through' on the other side and no signs of penetration really. Doing a transit chassis one day this week and just borrowed a power king 140 from a neighbour. After a quick go it welds alright but got a lot of penetration, almost as much weld underneath as on top. Is to much a good or bad thing? I'll put pics up later if I can