Tips for stud welding
Avoiding magnetic
blowing actio
Magnetic blowing action develops if the current distribution
in the work piece is not regular. You can recognize
magnetic blowing action by a welding bead which is
strengthened and raised on one side. The bigger the
diameter of the stud, the more clearly this effect occurs.
Please, pay attention to the notes in the German DVS
instructions 902, DIN 8563 T.10 and DIN EN ISO 14555.
If you have difficulties with arc blowing action you cannot
solve yourself, please contact your country representative
or DABOTEK:
Generally: install the two connections to earth equally far
from the welding point. But:
.
material accumulations on one side of the connections
to earth
.
false alignment of the welding gun cable
.
one-sided current carrying
can generate magnetic blowing action.
Remedial measures against material accumulation:
Remove earth cables opposite the material accumulation
or install them further away from the welding point.
Remedial measures against false alignment of the welding
gun cable:
Hold welding cable parallel to the connections to earth. If
this is impossible install earth cables on the other side of
the welding cable further away from the welding point.
Remedial measures against one-sided current carrying:
Connect second earth cable.
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