Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 409
as large as 7 or 8 squareinches in section and may require as much as 200 horsepower forlarge work. Butt- or spot-welding machines can be operated fromany single-phase power circuit supplying current at a constantvoltage by providing the proper transformer, but direct currentcannot be used. 365 72… … Fig. 93. Samples of Butt WeldingCourtesy of Toledo Electric Welder Company hydraulic cylinder to bring the pieces together and to apply therequired pressure when properly heated. The current is carriedinto the pieces through the jaws and is usually turned on auto- 366 WELDING 7?
Electrical engineering
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