stud welding products StudPro 2500, Руководство по эксплуатации

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34 CD 2301 Order No. BA 92-12-0231A Issue 05.01.10
5.8.3 Arc Blow Effect
A so called arc blow effect can occur with unproportionally distributed ground connec-
tions in relation to the base material mass, varying material distribution, or welding at
the edge of a work piece. This is an undesired deflection of the arc. It causes a single-
sided melting of the stud material, increased pore formation, and undercuts in the
welding area.
The arc blow effect is proportional to the current and can be influenced by symmetric
installation of the ground clamps, by fitting of compensation masses, or by rotating the
welding gun around its vertical axis (applies for welding guns with external welding
cable).
Arc blow effects and some corrective actions
(according to standards, see appendix)
Cause Corrective action
5 Stud Welding Procedure
5.8 Checking the Quality of the Weld
INSPECTING THE WELD
Visually inspect the weld. A good weld will result in an all‐around weld, with a small
visible amount of weld surrounding the flange of the stud. Too much splatter and the
weld is too hot, lower the voltage. No splatter and the weld is too cold, increase the
voltage.
If you get weld flash to one side of the stud as opposed to an even amount around
the base of the flange, this is called “arc blow”, and can be solved by repositioning
the ground clamp or using a dual ground clamp.
Proper welded studs can be tested by either torquing or bending the stud. The
welded flange of the stud should stay in place using either method, even though the
threaded portion of the stud breaks. If the base material is very thin, then a full slug,
the diameter of the flange will pull from the base metal for a properly welded stud.
CD Stud Welding Steps
SET-UP AND WELDING
ARC BLOW EFFECT