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By Robert L. O'Brien

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Figure A-7-Steps in Arc Stud Welding Welding Encyclopedia ARC STUD WELDING (SW) the ferrule (arc shield) is placed in position over the end of the stud, and the gun is properly positioned for welding. The trigger is then depressed, starting the automatic welding cycle. A solenoid coil within the body of the gun is energized. This lifts the stud off the work, and at the same time, creates an arc. The end of the stud and the workpiece are melted by the arc. When the preset arc period is completed, the welding current is automatically shut off and the solenoid is deenergized by the control unit.

The work itself becomes the anode in the plating bath and metal is thrown off rather than put on. Nascent oxygen is released at the anode. This immediately attacks the metal surface and forms an extremely hard oxide film. The anodizing treatment is widely used in the aircraft industry, and to treat aluminum automobile pistons. APPARENT EFFICIENCY In alternating current apparatus, apparent efficiency is the ratio of net power output to the volt-ampere input. ARC See STANDARD WELDING TERMS. See also WELDING ARC.

It is usually done with taps on the primary of the welding transformer. An adjustment which provides an upset current of about 15 500 amp/cm2 (100 000 amp. 2) is used. The current obtained during flashing is from 1/5 to 1/3 of the current which flows after the parts have come into good contact during the upset. Welding Time. The transformer is energized before the parts to be welded have come into contact and is de-energized by opening a contactor (or by other means) in the primary supply to the welding transformer.

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