Electric heating – Metal heating – By arc
Patent
1974-05-16
1976-11-02
Truhe, J. V.
Electric heating
Metal heating
By arc
219131WR, B23K 900
Patent
active
039899225
ABSTRACT:
A pulsed arc welding system is disclosed in which improved performance is obtained through the use of positive switch control in the welding transformer secondary winding. The switch means is programed through solid-state gate drivers which are in turn controlled for controlled rectification on each half cycle by a phase control, the operation of which is initiated by sensing the secondary winding voltage. Thus, it is possible to accurately control a high current interval and a low current interval with precision to obtain optimum welding and weld control.
The time intervals for high level and low level welding current are also precisely controlled through digital counting techniques which permit a full range of control from zero to one hundred per cent high current mode of operation and a high current period as well as a low current period varying from 1/60 to 1-4/5 seconds.
REFERENCES:
patent: 3284666 (1966-11-01), Hajicek
patent: 3308340 (1967-03-01), Gille et al.
patent: 3622744 (1971-11-01), Main et al.
patent: 3777113 (1973-12-01), Arikawa et al.
patent: 3818177 (1974-06-01), Needham et al.
patent: 3826890 (1974-07-01), Bartlett
patent: 3838244 (1974-09-01), Petrides et al.
Shaw Clifford C.
Truhe J. V.
United Air Lines
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