Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
51
Problem
Possible Cause
Solution
Stud HANGS-UP
during the weld
Mechanical bind in gun.
Manually depress chuck adaptor and release. Chuck adaptor
must return to the full out position rapidly without binding. If
necessary, disassemble and clean the gun.
On Heavy Duty guns, ensure that the weld cable is centered
between the legs and does not rub on them.
Base material contamination.
Contamination of the base plate or stud may cause the arc to
become erratic. Ensure that there is no rust, scale, oil, water,
residue, paint, galvanization, etc. present between the stud
and the workpiece. Welding to a clean plate can help
diagnose if there is any foreign substance on the base
material or studs.
Incorrect ferrule.
Ensure that the ferrule being used is the proper ferrule for
the stud size and application.
Actual main arc
time is different
than
programmed
weld time set-
point. No error
code displayed.
F31 gun drop time is not
calibrated against the gun in
use. Go to F31 and perform
calibration.
Short circuit in the middle of a weld, due to low lift height, out
of position welding, or welding into angle iron.
Summary of Contents for ArcCharger N550C DOMESTIC
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