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36
13 Checking the Quality of the Weld
You don’t need to test all studs.
It is sufficient to carry out stud tests on several production samples that are
picked at random.
Bending Test
Type of fracture
Possible cause
Corrective actions
Base material buckling
Correct parameters
none
Fracture in welding element above
flange
Correct parameters
none
If the strength of the joint is inadequate, then:
check whether the surface of welding element and base material are clean and
electrically conductive.
They must be free from scale, oil, paint, oxide layers.
Grind off hardened workpiece surfaces (e.g. roll hardening).
Check the piston of the welding gun for ease of movement.
Summary of Contents for ACCU-TWIN 92-10-2280
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