Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
37
TROUBLESHOOTING INCONSISTENT DROP TIMES
1.
Eliminate excessive lift.
Too much lift increases the possibility of stud hang up.
2.
Be sure the weld energy is appropriate for the application.
3.
Inspect foot alignment.
Adjust if necessary. A misaligned foot will almost guarantee stud hang-up. Ensure
that the stud is centered within the ferrule.
4.
Inspect chuck.
Replace if necessary. Check for a good grip of the stud in the chuck. A good grip is
needed to eliminate slipping of the stud.
5.
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.
6.
Inspect and clean gun housing and related parts
. Replace parts as needed. Debris in the housing will
resist travel.
5.7
Inspection and Testing of the Weld
To assure the quality of stud welds, the following testing must be carried 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 documentation.
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 documentation.
1
See the following pages for information on visual inspection
Summary of Contents for ArcCharger N550C DOMESTIC
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