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13 Checking the Quality of the Weld
You don’t need to test all studs.
It is sufcient to carry out stud tests on several production samples that are
picked at random.
Bending Test
Type of fracture Possible cause Corrective actions
Tearing of parent material Correct parameters none
Fracture above collar after sufcient
deformation
Correct parameters none
Fracture within the weld.
High porosity
Weld energy too low Increase current and/or
welding time
Unclean surface Clean the surface
Material not suitable for stud
welding
Select suitable material
Fracture of weld
Bright appearance
Welding time too low. Increase welding time
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.
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