Explain the process of upset welding, and the difference between upset welding and flash welding.
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In upset welding, two pieces of metal having the same cross section are gripped and pressed together. Heat is generated in the contact surfaces by electrical resistance. The upset at the interface extrudes the contaminated contact area to the outside, where it is trimmed.
Flash welding has an arcing action at the contacting surfaces. No flashing occurs in the upset process. The main difference between the upset and flash processes is that less current is needed in the upset process and welding time is extended.
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