Connection device for stud welding detection

The utility model discloses a connection device which is used for the stud welding test, and consists of a sleeve, a connection rod, a positioning nut and a lock screw; wherein, the connection rod is connected fixedly to the end of the sleeve; the positioning nut is embedded in the inner part at the front end of the sleeve and is locked by the lock screw; the screw thread hole of the positioning nut is adaptive to the size of a welding stud to be tested; the top end of the positioning nut, taking the axial line of the screw thread hole as a revolving center line, is provided with a countersink groove; the diameter of the countersink groove is slightly bigger than the maximum circular diameter of the root of the welding stud to be tested. The connection device of the utility model cooperates with a pneumatic torsion gun and can realize the non-destructive torque test stud welding. The utility model has the advantages that components are not damaged in the testing, the production cost is low, one-hundred percent inspection can be satisfied, the stud welding quality control is strengthened, fixed torque safe test stud welding guarantees the stud from being damaged and realizes non-destructive testing in real sense, etc.