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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. 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 How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Range of 15-, 20-, 30-, and 40-kHz ultrasonic systems with 150- to 6000-w power for most assemblies including welding, staking, spot welding, inserting, swaging and degating. Other lines are using robots for handling bodies and components, such as for spot welding. Baling wire, duct tape and spot welding mend the metal bodies, most of which are over 25 years old. |
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