Air operated butt welder is used to weld the wire coiled ring's two ends together to make it a complete ring. Features ? High speed, capable of welding 8000 rings per 8-hour shift ? Small heat affected area, approximately 3-4mm, especially applicable for welding galvanized wire ? This equipment is not recommended to weld stainless steel rings, there is an argon arc welding machine available specificly for welding stainless steel ring, the operating method is the same.