Electric heating – Metal heating – For bonding with pressure
Patent
1985-12-12
1987-11-24
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219116, 363 56, B23K 1124
Patent
active
047091320
ABSTRACT:
A measuring winding (208) which is connected to a signal frequency generator is additionally disposed on the core (206) of a welding transformer (TR2). A voltage depending on the state of saturation of the core (206) is tapped off at the measuring winding (208) by a detector circuit (204). An amplitude demodulator (204b) delivers a direct voltage signal which is inversely proportional to the saturation. By comparison with a reference value, a discriminator circuit determines whether a threshold value related to saturation has already been reached or not. If it is reached, the firing of the power semiconductors is interrupted by a blocking signal. With this saturation monitoring arrangement, the welding device can be operated more easily and the welding transformer can be utilized in the optimum manner. The method of control becomes considerably simpler because the welding time no longer needs to be split up into individual impuses by the operator.
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patent: 4282417 (1981-08-01), Jurek
patent: 4439822 (1984-03-01), Cocconi
Mettler Paul
Tengler Hermann
Elpatronic AG
Shaw Clifford C.
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