Tightening device with auxiliary centering function

The invention discloses a tightening device with an auxiliary centering function. The tightening device with the auxiliary centering function is characterized in that the tightening device comprises asliding seat, a tightening mechanism and a thrust mechanism; the tightening mechanism comprises a shell and a top shaft, wherein the left end of the top shaft extends out of the left end of the shell, the right end of the top shaft is provided with a round hole for accommodating the small end of a right workpiece, and the outer circular surface of the top shaft is provided with a centering mechanism for easy centering of the right workpiece; the left end of the top shaft is sleeved with a protective cover which is removably connected on the left end face of the face; the top of the protectivecover is provided with a welding gun hole for easy penetration of a welding torch, and the bottom of the same is provided with a collection box for easy collection of welding slag. The tightening device with the auxiliary cen