Welding machine for butt joint of welding neck flanges

The utility model discloses a welding machine for butt joint of welding neck flanges. The welding device comprises a first welding frame, a second welding frame and a supporting adjusting mechanism. The support adjusting mechanism is arranged between the first welding frame and the second welding frame; wherein the first welding frame and the second welding frame are symmetrically arranged, each of the first welding frame and the second welding frame comprises a transverse moving mechanism, a vertical moving mechanism, a bottom walking mechanism and a welding head, and the vertical moving mechanism is connected with the bottom walking mechanism. Through the arrangement of the double welding frames and the double adjusting wheel assemblies, welding work can be conveniently carried out on the welding neck flanges at the two ends of the straight pipe, a workpiece can be driven by the cylindrical adjusting rolling wheels to accurately and evenly rotate, and the quality of a welding seam iswell guaranteed; and tra