Stud welding method
AssigneeHBS Bolzenschweiss-Systeme GmbH & Co. KG
InventorUdo Franz
Life of this patent
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Abstract
To evaluate the quality of a weld produced by a stud welding process, the time characteristic of the resistance R (t) between the stud and the workpiece is determined. If the resistance or the increase in resistance or the rate of increase of the resistance exceeds a predetermined value during the arc period, this is an indication of arc blow effects, of spattering, and of the arc burning outside the bonding area--effects which impair the quality of the weld. Upon detection of a predetermined resistance increase, the weld process is terminated by turning off the weld current or by immediately immersing the stud into the melt of the workpiece. Alternatively, the characteristic of the resistance over time detected in a first welding process can be used to set the parameters for subsequent welding processes.
Claims15
A method of stud welding a part to a workpiece, comprising the steps of:
- (a) contacting said part to said workpiece;
- (b) feeding a current through said part to said workpiece so that an arc builds between said part and said workpiece to fuse an area portion of said part to a facing area portion of said workpiece;
- (c) detecting a time characteristic of a resistance between said part and said workpiece;
- and
- (d) pressing said part and said workpiece against one another so that said fused parts solidify, wherein said time characteristic is used to evaluate a quality of a finished weld.
Dependencies are inferred from the claim text.