Electric heating – Metal heating – For bonding with pressure
Patent
1982-08-06
1985-01-29
Envall, Jr., Roy N.
Electric heating
Metal heating
For bonding with pressure
219 90, 336 96, B23K 1124, H01F 2702
Patent
active
044968213
ABSTRACT:
A transformer for electric welders, especially welders having a welding gun secured to a robot arm, comprises a small lightweight loop core having first and second substantially C-shaped sections abutted together at their free ends with primary and secondary windings coaxially wrapped about one pair of abutting shanks. The secondary winding comprises an elongated flat sheet wrapped around abutting shanks of the core and has projecting tabs extending from opposite sides of the sheet. A primary winding comprising a plurality of coil sections is coaxially wrapped about the secondary winding whereby the secondary winding is substantially entirely coupled to the primary winding. The windings are encapsulated in a dielectric material such as a synthetic polymer resin. The transformer is preferably connected to a high frequency electrical power source.
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Burgher Peter H.
Marsden Raymond F.
Envall Jr. Roy N.
Keve Alfred S.
Marelco Power Systems, Inc.
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