HBS ARC 1550 Operating Manual page 49

‹ 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.
Beschaffenheit des Bruchs
Tearing of parent material
Fracture above collar after sufficient
deformation
Fracture within the weld.
High porosity
Fracture of weld
Bright appearance
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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13 Checking the Quality of the Weld
Bending Test
Mögliche Ursache
Correct parameters
Correct parameters
Weld energy too low
Unclean surface
Material not suitable for stud
welding
Welding time too low.
Korrekturmaßnahmen
none
none
Increase current and/or
welding time
Clean the surface
Select suitable material
Increase welding time
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