Opening-nozzle saddle-shaped seam welding equipment

The invention relates to opening-nozzle saddle-shaped seam welding equipment, which mainly comprises a cross-shaped automatic operation machine (1), a welding head track (2), a welding head (3) and a cylinder body workpiece (4). An axial moving device (11) of the cross-shaped automatic operation machine (1) is connected with a corresponding basic part; a vertical lifting arm (12) of the cross-shaped automatic operation machine (1) is assembled together with a transverse moving arm (13) by taking the axial moving device (11) as the base and is connected with the welding head track (2) through a suspension arm (17); and the welding head (3) is connected with the welding head track (2) through a locking mechanism (31) and can run along a ring-shaped track (21). The equipment achieves the function of multiple purposes, namely can perform gas cutting or plasma cutting on a saddle-shaped bevel pipe end and a pipe hole, and can perform high quality welding between the bevel pipe end and the pipe hole after an actuating mechanism is replaced; and in addition, the equipment has a compact and simple structure and is very suitable to be used on a construction site.