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Projection Welding
This is a modified method of making single or multiple spot welds. Projection welds are made by providing an embossment or projection on one or both of the contacting base metal surfaces to localise the pressure and current flow at a particular point. The process is employed for fabrication of automobile components, wheels, etc.
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SPOT WELDING In this type of welding, after proper cleaning of the surfaces, the metals to be welded are kept one above the other and two copper electrodes are kept on both sid
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