Auxiliary tool for optimizing welding spot of C-shaped welding gun

The utility model provides a C type welding gun welding spot optimization auxiliary tool, a welding gun comprises a calibration electrode cap arranged on an upper electrode arm, one end of the calibration electrode cap opposite to a lower electrode arm is provided with a telescopic assembly detachably connected with the calibration electrode cap, and the telescopic assembly has a welding position and an initial position. The telescopic assembly comprises at least three telescopic caps, the upper end faces of any adjacent telescopic caps are located on the same plane, the three telescopic caps are parallel to the axis of the calibration electrode cap, and at the initial position, the telescopic caps do not make contact with external parts. In the welding position, the upper end face of the telescopic cap is attached to the surface of an external part, and the auxiliary tool can overcome the defect that in the prior art, welding spots need to be continuously punched for observation when optimized, and consequen