7 Start-up and weld quality check Page 43
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
7.5 Checking weld quality
To ensure quality stud weld connections, the following tests must be made before,
during and after production:
• Normal work inspection,
• simplified work inspection,
• ongoing production monitoring.
• Normal work inspection:
For welding according to the drawn arc and short cycle drawn arc process, 10 studs
must be welded, on which the following tests are to be made:
1. Visual inspection 2. Bend test 3. Macrosection
(all studs)
*)
(5 studs) (2 studs)
The test results must be documented and added to the quality documentation.
• Simplified work inspection:
To check the device settings and functionality, before start of shift, three studs must be
welded, on which the following tests must be made:
1. Visual inspection (all studs)
*)
2. Bend test (all studs)
The test results must be documented and added to the quality documentation.
• Ongoing production monitoring:
During ongoing production monitoring, generally a visual inspection of all welded studs
is adequate. If an incorrect weld joint is suspected, a bending test or tensile test must
be done.
If the requirements are not met, bending or tensile testing must also be done on the
three next welds.
The test results must be recorded in the production book.
Warning:
• Make sure welding work does not continue until the test results are
satisfactory.
*) Information for visual inspection can be found on the following pages.
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