Upset welding: Difference between revisions
Wtshymanski (talk | contribs) dead link |
Pbsouthwood (talk | contribs) Adding short description: "Electric resistance welding technique where the heated parts are forced together resulting in a thickened section along the weld area" (Shortdesc helper) |
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{{short description|Electric resistance welding technique where the heated parts are forced together resulting in a thickened section along the weld area}} |
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{{unreferenced|date=December 2019}} |
{{unreferenced|date=December 2019}} |
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[[File:Scheme of the machine for butt resistance welding.png|thumb|right|250px|upset(butt)welding machine]] |
[[File:Scheme of the machine for butt resistance welding.png|thumb|right|250px|upset(butt)welding machine]] |
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Revision as of 15:48, 7 October 2020
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Upset welding (UW)/resistance butt welding is a welding technique that produces coalescence simultaneously over the entire area of abutting surfaces or progressively along a joint, by the heat obtained from resistance to electric current through the area where those surfaces are in contact.
Pressure is applied before heating is started and is maintained throughout the heating period. The equipment used for upset welding is very similar to that used for flash welding. It can be used only if the parts to be welded are equal in cross-sectional area. The abutting surfaces must be very carefully prepared to provide for proper heating. The difference from flash welding is that the parts are clamped in the welding machine and force is applied bringing them tightly together. High-amperage current is then passed through the joint, which heats the abutting surfaces. When they have been heated to a suitable forging temperature an upsetting force is applied and the current is stopped. The high temperature of the work at the abutting surfaces plus the high pressure causes coalescence to take place. After cooling, the force is released and the weld is completed.