Automatic tracking device for welding seam of steel pipe

The utility model relates to the field of steel pipe manufacturing equipment, in particular to an automatic steel pipe welding seam tracking device which comprises a housing and a detection assembly. The cover shell is fixedly connected to an inner cutter assembly and an outer cutter assembly of the weld joint cleaning machine, the cutter is sleeved with the cover shell, the cover shell is provided with an opening for the cutter to leak out, and the leaked part of the cutter is used for cleaning a weld joint. The detection assembly comprises a shell and a piston rod, the shell is fixedly connected with the housing, the piston rod is slidably connected with the shell, the tail end of the piston rod is always connected with the inner wall or the outer wall of the steel pipe to be cleaned in a jacking mode, and a sensor used for detecting the moving distance of the piston rod is arranged in the shell. According to the automatic tracking device for the steel pipe welding seam, accurate positioning of the welding