spot welding
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spot welding
[′spät ‚weld·iŋ] (metallurgy)
Resistance welding in which fusion is localized in small circular areas; sometimes also accomplished by various arc-welding processes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Spot welding
A resistance-welding process in which coalescence is produced by the flow of electric current through the resistance of metals held together under pressure. Usually the upper electrode moves and applies the clamping force. Pressure must be maintained at all times during the heating cycle to prevent flashing at the electrode faces. Electrodes are water-cooled and are made of copper alloys because pure copper is soft and deforms under pressure. The electric current flows through at least seven resistances connected in series for any one weld (see illustration). After the metals have been fused together, the electrodes usually remain in place sufficiently long to cool the weld. See Resistance welding
McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive
While many report good results with these light duty
spot welders, my years of experience make me skeptical.
The Inverter
Spot Welder machines have the facility to record and store data from every weld produced, as well as store vehicle data for each job task - making all welds traceable.
The 40-year-old
spot welder was left battered and bruised, but unbowed by the attack on May 19.
Ray then worked as a
spot welder and fitter at The Rover Company, for 30 years.
Novolas C is a contour or
spot welder, which creates a circular spot of laser energy that is shaped and focused by optical devices.
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