© 2016 Nelson Stud Welding, Inc.
Page 18
All Rights Reserved.
January 2016
Part No. 729-110-043 Rev. 1.02
Dirt inside weld tool prevents smooth
operation and hangs up or slows gun
operation.
Return weld tool to Nelson for service.
Problem: Arc Blow
Characterized by weld spatter of fillet on only one side of the stud (looks like molten metal was “blown” out
from only the one side of the stud). This problem will often cause incomplete fillet formation on one side of the
stud. This incomplete cross sectional welding may lead to weld failure.
Possible Causes
Possible Solutions
Molten metal runs away from the
ground. Incomplete or insufficient
grounding can cause this problem.
Double Ground. The addition of another ground on opposite sides of
the weld area will reduce this problem. The object will be to always
weld between the grounds. If you need assistance contact your
Nelson Representative.
Welding near the edge (1/4 inch or
less) of a piece of metal will
potentially cause these phenomena.
Unusual electrical current patterns are
set up near the edges of metals and
this can affect the flow of metal.
Place another piece of sheet metal of the same type and thickness
next to the edge you are welding. This will “fool” the electrical
currents and they will act like you are welding in the middle of the
sheet metal.
