Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 573
n built for weldingthrough i thicknesses of plate. Such a machine has a currentcapacity of 100,000 amperes and is capable of exerting a pressureof 75.000 pounds. Duplex machines having a six-foot span, anddesigned to weld two spots at a time have been used to a limitedextent to replace riveting… … Deposited metal. X75. Spot welding machines, particularly when heavy currents arerequired, are heavy and for use where portability is necessary,recjuire crane service. The single-phase current used is also a dis-advantage, for power companies object to the unbalancing oftheir systems. When small…
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