| 摘要 |
<p>A welding system for welding a new stud onto the end of a broken-off stud which comprises a welding gun having a forward end and a rear end, the forward end of the gun supporting a new stud to be welded to the end of a broken-off stud, the new stud being threaded at least along a rear portion thereof, a shroud mounted at the forward end of the gun and surrounding the new stud, the forward end of the new stud projecting outwardly from the gun into the shroud, the new stud having a longitudinal bore extending from the rear end thereof to a location adjacent to the forward end thereof where the bore flares outwardly to a larger bore at the forward end of the new stud, the new stud also being provided with slots at the forward end diametrically opposite from each other and in the region of the enlarged bore, a coated welding rod supported by the gun and extending from a location adjacent the rear of the gun through the bore in the new stud and to a point adjacent the forward end of the new stud, the welding rod having an internal steel core and being coated with a nonconductive flux, a high frequency voltage connected between the core of the welding rod and the broken-off stud to initiate a welding arc when the new stud is in abutting relation with the broken-off stud, a d.c. welding current connected between the core of the welding rod and the broken-off stud following the initiation of the arc by the high frequency voltage and a drive motor simultaneously with the initiation of the d.c. welding current to advance the welding rod through the new stud and towards the broken-off stud.</p> |
