Rolling cone piece butt joint welding method

The invention provides a rolling cone piece butt joint welding method and belongs to the cone forming process. The problems that an existing manual butt joint method is large in labor intensity and poor in locating accuracy are solved. The method includes the butt joint step and the welding step, wherein in the butt joint step, a cone piece is in butt joint after being sleeved with a hoop, the cone piece is tightened through the hoop, and the butt joint gap of the cone piece is within 1 mm; in the welding step, the cone piece is kept in the butt joint state through the hoop, so that the cone piece is smoothly welded. The rolling cone piece with the thickness ranging from 2 mm to 6 mm is adopted for butt joint, the state of the cone piece is stable after butt joint is conducted, an advantageous guarantee is provided for welding, labor intensity is remarkably relieved, the requirement for accuracy of the rolling cone piece is lowered, the problems that the cone piece is poor in butt joint accuracy and large in thickness dislocation after being rolled, so that welding is difficult or welding locating accuracy is poor are solved, and the method is particularly suitable for formation of the conic parts with the thickness ranging from 2 mm to 6 mm.