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3 THE MARINE REVIEW ___...,. February, 19 See ane om wan at four Weldin , Equipment Must Supply | PEP ‘ ie ae da tart 4 Ne ie ee w > > elding Arc The three prime requisites of Electric Arc Welding Equipments are— 1. Sufficient potential capacity to sustain the arc when lengthened, for you have to overcome irregularities in the material being welded, which cause variations in the resistance of the circuit. 2 ee ON REC Te 2. In starting the arc your current should not shoot up too high, but should be above the normal welding current in order to give the necessary heat at the start. 3. Constant heat at the arc. This requires variable voltage at the arc to maintain constant current, as the heat of the arc depends on the current flowing. The reason that variable voltage is required to maintain constant current is due to variation in the resistance of the arc path or circuit due to the following: (a) foreign matter such as | scale, rust, etc. in the path of the arc, (6) variation in the length of the arc caused by the molten metal traveling from the electrode to the weld, (c) unsteadiness of the opera- tor’s hand and (d) unevenness of the surface over which the welding arc is directed. Westinghouse Electric Arc Welding Equipments meet these requirements. - Built in sizes from 150 ampere to 1000 ampere capacity. 1. Single operator equipment—Stationary type. 2. Single operator equipment—Portable type. 3. Multiple operator equipment. Built for all commercial circuits, either alternating or direct current. WESTINGHOUSE ELECTRIC & MANUFACTURING CO. East Pittsburgh, Pa. Please mention Tue Marine Review when writing to Advertisers ‘ x Reed Wink as ay 2 5 Epa step of: ;