6. Tighten foot‐retaining screws. These screws hold the foot in place during a weld
while pressure is placed on the foot. Slippage of the foot will lead to a faster drop
time.
7. Inspect and clean gun housing and related parts – replace parts as needed.
Debris in this housing will resist travel.
6.7 Inspection and testing of the weld
To assure the quality of stud welds the following testing must be car‐ ried out before,
during and after production:
•
standard work testing
•
simplified work testing
•
continuous production monitoring
Standard work testing:
For welding according to the drawn‐arc and short‐cycle method ten studs must be
welded and the following tests carried out on them:
•
Visual inspection (all studs
1
)
•
Bending test (5 studs)
•
Macro section (2 studs)
The test results must be documented and attached to the quality docu‐ mentation.
Simplified work testing:
In order to check the setting and functionality of the unit three studs must be welded
prior to beginning the shift and the following tests are to be carried out on them:
•
Visual inspection (all studs)
•
Bending test (all studs)
The test results must be documented and attached to the quality docu mentation.
Continuous production monitoring:
In continuous production monitoring visual inspection of all welded studs is in general
sufficient. On suspicion of a faulty weld a bending test or a tension test must be
carried out.
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