Tuesday, 20 November 2012

Spot welding process with diagrams

That type of resistance welding process which produces only one weld pot a time between two metal sheets, is known as spot welding.
Process Illustrates the schematic arrangement of spot welding .
It is probably the simplest type of resistance welding .two or more metal sheets are held between electrodes .the welding cycle begins with the electrodes holding the metal sheet under pressure before passing the current ,and for a period known as the squeeze time .A current of sufficient amperage and low voltage is then passed .this causes the metal in contact with the electrodes to immediately rise to a welding temperature .soon after reaching this temperature ,the pressure between the electrode squeeze the metal together completes the weld.

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