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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
Fracture in the weld metal
Weld energy too low
Increase weld energy
Plunging speed too low
Increase plunging speed
Unsuitable stud/base material
combination
Replace welding element or
workpiece
If the strength of the joint is inadequate, then:
check the setting of the stud welding unit.
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.
Содержание 92-10-1504B
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