Deep penetration welding gun structure

The invention belongs to the technical field of welding, and particularly relates to a deep penetration welding gun structure which comprises a welding gun body and a blocking and protecting mechanism. The welding gun main body comprises a welding gun handle, a tungsten electrode and a gas nozzle; the welding gun handle is arranged in the middle of the welding gun body. The air nozzle is arranged at the lower end of the welding gun body, and the lower end of the air nozzle is provided with a conical part. The tungsten electrode is arranged at the lower end of the welding gun main body, and the tip extends out of the lower end of the gas nozzle conical part; according to the blocking and protecting structure, a blocking piece or an arc-shaped blocking strip is used as a support to abut against a groove of a welding seam, a welding gun can be conveniently swung with the contact point of the blocking piece or the arc-shaped blocking strip and the groove as a fulcrum, a tungsten electrode can conveniently move al