Upright full-automatic argon arc welding process for bimetal composite pipes

The invention discloses an upright full-automatic argon arc welding process for bimetal composite pipes. The process comprises the following steps: (1) the preparation is performed before welding; (2)the bottoming welding is performed; and the upright welding is performed in bottoming from the position of 6 o'clock to the position of 12 o'clock; (3) the welding process is divided into a hot welding bead and filling; the upright welding is performed in the hot welding bead and the filling from the position of 6 o'clock to the position of 12 o'clock, wherein the peripheral angles of pipe bodiesare divided into four sections; the filling is divided into multiple layers according to different wall thicknesses; and each layer is once welded; (4) a cover surface is adopted in the welding process, and is uprightly welded from the position of 12 o'clock to the position of 6 o'clock; and (5) nondestructive detection is performed after welding. The process solves the full-automatic all-position welding demand problem,