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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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One of the criticisms of lasers is that they are more difficult to maintain than a spot welder, which is undoubtedly true, especially since there are so many people who have a strong familiarity with working on spot welding equipment. Novolas C is a contour or spot welder, which creates a circular spot of laser energy that is shaped and focused by optical devices. When he started working as a spot welder in a factory in Auckland, he missed out on his morning tea because he did not realize that when the foreman shouted `Smoko |
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