ARTICLE 630. ELECTRIC WELDERS


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ARTICLE 630. ELECTRIC WELDERS
ARTICLE 630. ELECTRIC WELDERS630.1. Scope. There are two general types of electric welding: arc welding and resistance welding. In arc welding, an arc is drawn between the metal parts to be joined together and a metal electrode (a wire or rod), and metal from the electrode are deposited on the joint. In resistance welding, the metal parts to be joined are pressed tightly together between the two electrodes, and a heavy current is passed through the electrodes and the plates or other parts to be welded. The electrodes make contact on a small area—thus the current passes through a small cross section of metal having a high resistance—and sufficient heat is generated to raise the parts to be welded to a welding temperature. Either type of welding and cutti…
Citation
Frederic P. Hartwell; Joseph F. McPartland; Brian J. McPartland: McGraw-Hill's National Electrical Code 2017 Handbook, 29th Edition. ARTICLE 630. ELECTRIC WELDERS, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export