TEC® TIG spot weld guns will spot weld such materials as mild steel, stainless steel, monel, inconel in thickness of 3,2mm (1/8") or less from one side only. The TIG spot weld process is not suitable for aluminum, galvanized or coated materials. The TIG spot weld process uses a conventional TIG welding machine and must be equipped with a spot timer and high frequency arc starting. The spot gun is connected to the welding machine just like a manual TIG torch. The spot guns are simple to use and are constructed of durable long lasting material. Replaceable locator tips are constructed of durable copper and are available for tacking inside or outside corners, butt and lap joints.