Method and device for removing welding slag generated after grinding of inner welding joint of spiral welding pipe

The invention relates to a method and device for removing welding slag generated after grinding of an inner welding joint of a spiral welding pipe. The device for removing the welding slag comprises a steel wire brush and a steel wire brush through shaft. One end of the steel wire brush through shaft is fixedly connected with the shaft end of a rotary shaft of an outer welding joint grinder through threads, the inner ring of the steel wire brush is fixedly connected with the steel wire brush through shaft through a long key, and the rotary shaft of the outer welding joint grinder can drive the steel wire brush to rotate through the steel wire brush through shaft. The shaft end of the steel wire brush is fixed through a locknut. As the steel wire brush is detachably installed on the outer welding joint grinder, the residual welding slag generated after the inner welding joint is ground can be electrically removed, installation and use are convenient, one device has dual purposes, the utilization rate of existing equipment is increased, and the labor intensity of field staff is reduced.