Works for me. As I mentioned before I'm doing this wrong for my dryer as we speak. I have my welding outlet as a box directly connected to my main breaker panel, I have a jumper hooked up to run my dryer off my welding outlet. Only the way my welding outlet is wired there is a heavy insulated wire from the ground terminal to the ground block. So I am directly grounding my neutral into my ground, if this outlet were on the other side of the shop this would be a big no no as I would be sending current through exposed ground path. But it all happens in the Box so it works safely. In reality the welder's ground clamp has a terminal on the welder, from that terminal there is a path to the ground outlet on your wall. Make sure that lug has a path to ground, and just ignore the neutral terminal on the outlet. Shit find any metal junction box in your welding area, attach a jumper cable lead to that and ground your welder.