Electric heating – Metal heating – For bonding with pressure
Patent
1989-04-25
1990-09-04
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219115, B23K 1124
Patent
active
049546864
ABSTRACT:
A contol apparatus for a single-phase full-wave resistance welder in which anti-parallel connected thyristors are connected in series with a primary winding of a welding transformer and which controls a firing phase .theta.n of the thyristors to adjust a welding current, includes storage means for calculating and storing a square sum SK in such a manner that a sinusoidal value VK=K0sin.theta.K having a given peak value is divided at predetermined phase intervals (1.degree.) within a predetermined phase range (180.degree.), and the square sum SK=V1.sup.2 +V2.sup.2 +V3.sup.2 +. . . VK.sup.2 of the sinusoidal value VK with respect to each phase .theta.K is calculated in units of divided phases .theta.K (.theta.K=1.degree., 2.degree., 3.degree., . . . , 180.degree.) in advance, and Vx calculating means for reading out square sums Sn and Sm of the firing phase .theta.n and energization end phase .theta.m from the storage means and calculating a normalized effective value Vx of an effective voltage applied to the welding transformer.
REFERENCES:
patent: 4104724 (1978-08-01), Dix et al.
patent: 4419559 (1983-12-01), Izume et al.
patent: 4721906 (1988-01-01), Ferguson et al.
Kabushiki Kaisha Toshiba
Shaw Clifford C.
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