N1500i FACS Manual
10
Part No. 729-110-053 V.1.03
© 2018 Nelson Stud Welding, Inc. All rights reserved.
1.3 Arc Blowing Effect
Blowing effect is the designation for the lateral (sideways) deflection of
the arc from a centered position on the end of the stud. Depending on
the cause, a distinction is made between the following blowing effects.
Thermal blowing effect:
•
Deflection of the arc as a result of the expansion and
turbulence of heated gases in the combustion area of the arc.
Magnetic blowing effect:
•
Deflection of the arc as a result of the influence of magnetic
or electromagnetic fields.
To reduce the thermal blowing effect, strive for precise centering of the
stud and chuck.
Several remedial measures are available to reduce the magnetic
blowing effect, some of which are indicated below.
The polarity in the illustration refers to ferromagnetic materials. When
welding aluminum, attention must be paid to reverse polarity.
In order to favorably influence the arc,
the work piece ground terminals must
be placed as symmetrically as possible
to the point of welding.
In the event of a one-sided work piece
ground terminal, the arc blows away
from the terminal. This condition can
be eliminated by additional metal
plates.
Influence on the arc from the welding
cable itself can be minimized by turning
the weld gun through 90°.
When welding sections, arc blowing
can be reduced by repositioning the
work piece ground terminal and
additional metal plates.
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