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Resistance Welding
Resistance welding
Resistance welding involves the generation of heat by passing current
through the resistance caused by the contact between two or more metal surfaces.
Small pools of molten metal are formed at the weld area as high amounts of
current (1000-100000A) is passed through the metal. In general, resistance
welding methods are efficient and cause little pollution, but their applications
are somewhat limited and the equipment cost can be high.
Spot welding
Spot welding is a popular welding method used to join overlapping metal sheets of up to 3mm thick. Two electrodes are simultaneously used to clamp the metal sheets together and to pass current through the sheets. The advantages of the method include efficient energy use, limited workpiece deformation, high production rates, easy automation, and no required filler materials. Weld strength is significantly lower than with other welding methods, making the process suitable for only certain applications. It is used extensively in the automotive industry – ordinary cars can have several thousand spot welds. A specialized process, called shot welding, is used to spot weld stainless steel.
Seam welding
Like spot welding, seam welding relies on two electrodes to apply pressure and current to join metal sheets. However, instead of pointed electrodes, wheel-shaped electrodes roll along and often feed the workpiece, making it possible to make long continuous welds. In the past, this process was used in the manufacture of beverage cans, but now its uses are more limited.
Other resistance welding processes
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Flash welding
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Projection welding
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Upset welding
Licensed under the GNU Free Documentation License. Material from the Wikipedia article "Welding". This article is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
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