This weld head is a specialized welding head designed and developed for all position automatic welding of various tube plate joints Adopting pneumatic core expansion method, the welding gun can be fixed at the center of the pipe fitting, firmly clamped, and simplifying the difficulty of welding operations Suitable for welding pipe extension, pipe leveling, self melting, and wire filling The overall structural design is compact, with internal transmission for water and electricity, and no conduit winding at 360 ° One-button operation of the pneumatic core expansion copper sleeve allows the welding gun to be positioned quickly Arc length automatic control device and yaw control devicew, welding gun circulating water cooling, high temporary load rate, flexible welding operation space and wide range of parameters