I had no problems welding car body work with mt Rohr , 0.8 wire and universal gas ,,, and I mean no problems at all, so either the specs are wrong or your being fed wrong info. Mind you I have been welding car bodys for a lifetime , so Im quite well practiced .I have read the Rohr lowest current is 50amps car body needs 30a max or is someone mixing up voltage maximum 30v with amps?for thin metal work.