until all positioning feet touch the workpiece (this pushes the
plunger against the pressure spring).
The welding current is then switched on and the welding process
started by pressing the start button. The ignition tip evaporates
and generates an arc, which melts the face of the stud and the
workpiece.
The pre-stressed pressure spring then forces the welding element
into the weld pool and the arc is extinguished. The capacitors are
discharged completely. The weld pool solidifies.
This welding process lasts about 1.5 to 3.0 ms.
The welding gun can be pulled off the welding element vertically
directly afterwards and fitted with a new one.
.
Fig. 1 - 6 Contact stud welding sequence
Note:
A threaded stud was chosen as welding element in the figure above.
11
Other welding studs equipped with ignition tip are shown in chapter 1.8
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