Welding seam welding device for welding steel pipe

The utility model relates to the technical field of steel pipe welding, in particular to a weld joint welding device for welding steel pipes, which is characterized in that four symmetrically arranged supporting legs are fixedly connected to four corners of the bottom of a welding table respectively, and a vertically arranged concave frame is fixedly connected to the center of the upper side of the welding table; and a vertically-arranged electric telescopic rod is fixedly connected to the center of the transverse straight end of the concave frame, the lower end of the electric telescopic rod penetrates through the concave frame, extends downwards and is fixedly connected with a welding gun head, two rectangular housings are fixedly connected to the bottom of the welding table, and the two rectangular housings are symmetrically located on the two sides of the welding gun head correspondingly. According to the automatic steel pipe welding machine, the clamping mechanism is arranged to clamp a steel pipe to ach