Abstract：In the production process of coal mine roadheader, most of the welded parts with compact structure, small welding space and gradient groove of cutting head pick seat can only be produced by manual welding, and the product quality is unstable and the efficiency is not high. In view of this situation, based on the development of automatic welding technology, this paper takes EBZ160 roadheader as an example to develop an automatic welding technology for conical cutting head pick seat. Through the production of rotary displacement welding tooling, group positioning tooling, welding parameter mutation and gradual change, adding arc at the corner, establishing parameter offset selective subroutine and other technical means, the automatic welding of the cutting head pick seat is realized. Through industrial tests, it is verified that the weld strength of the pick seat of the automatic welding cutting head is firm and reliable, the service life is up to standard, and the production efficiency of the coal mine roadheader is improved.
