Shaft shoulder structure for static shaft shoulder friction stir welding and welding device

The shaft shoulder structure comprises a shaft main body, a shaft shoulder part and a pressing block, a first through hole is formed in the shaft main body in the axial direction, the first through hole is used for installing a stirring needle, the shaft shoulder part is arranged at one end of the shaft main body and arranged around the first through hole in the circumferential direction, and the pressing block is arranged on the shaft main body. The pressing block protrudes out of the shaft shoulder part. The thin plate is easy to tilt during welding, the pressing block is arranged on the shaft body, the pressing block arranged in a protruding mode can make contact with the thin plate firstly, the plate is pressed downwards to be guided, the plate is prevented from being tilted, the shaft shoulder part is not prone to tearing the plate during advancing, the welding stability can be improved, and the rejection rate is reduced. 本实用新型公开了一种用于静轴肩搅拌摩擦焊的轴肩结构及焊接装置，包括轴主体、轴肩部及压块，轴主体沿轴向设有第一通孔，第一通孔用于供搅拌针安装，轴肩部设于轴主体一端，且围