Small-angle groove welding method for large-wall-thickness shaft head circular seam of mining axle

The invention discloses a small-angle groove welding method for a large-wall-thickness shaft head circular seam of a mining axle, which is characterized in that a lockrand welding seam and a V-shaped groove are adopted, the welding seam groove gap is 6mm, and the welding seam groove angle is 30 degrees; mAG welding is adopted; the end of the common circular nozzle of the MAG gas shielded welding gun is pinched into an oval shape; the end part of the contact tube protrudes out of the end part of the nozzle by 3mm; by changing the shape of a nozzle of the MAG gas shielded welding gun and the distance between a contact tube and the nozzle, it is guaranteed that the end of the welding gun can penetrate into a weld groove, dry extension of a welding wire is guaranteed, welding parameters are stable, the gas shielded effect is guaranteed, and weld root fusion is good; a stable welding process can be obtained, and the defects of pores, poor fusion and the like of weld joints are avoided. 本发明公开了一种矿用车桥大壁厚轴头环缝小角度坡口焊接方法