Zero-angle stirring and abrading welding joint

The utility model discloses a zero-angle stirring and abrading welding joint. The zero-angle stirring and abrading welding joint is characterized by comprising a body; the body is provided with a cutter handle, a shaft shoulder and a stirring needle; the cutter handle is provided with an annular groove; the shaft shoulder is provided with an inner concave cavity which is internally provided with a convex rib; the stirring needle is of a conical table shape and is provided with a thread. The zero-angle stirring and abrading welding joint provided by the utility model has the beneficial effects that compared with a common stirring and abrading welding joint, the shaft shoulder of the welding joint provided by the utility model is not a plane any more, but a concave surface, can guarantee that a welding material can fill a welding clearance fully after zero-angle stirring and abrading welding, and can prevent defects of the welding clearance.