Electric heating – Metal heating – By arc
Patent
1985-06-05
1986-04-01
Shaw, Clifford C.
Electric heating
Metal heating
By arc
2191372, 21913771, B23K 912
Patent
active
045800260
ABSTRACT:
The invention provides an apparatus and a method for controlling the thermal state of a welding wire which is continuously fed and heated between two electric contact tips having a dielectric gap of a predetermined length therebetween. Heating is effected by passing an electric current between the two contact tips and through the wire. The method of this invention comprises the steps of characterizing the welding wire by establishing a preheating current versus wire feed rate relationship, predetermining the average temperature of the outcoming wire at known preheating currents and known wire feed rates, and establishing a series of temperature isotherms based at least in part on the aforedescribed relationship between heating current and wire feed rate. The apparatus includes a pre-programmed computer system which coordinates the wire feed rate and preheating power application to the cold wire according to the method of this invention.
REFERENCES:
patent: 4283617 (1981-08-01), Merrick et al.
patent: 4456814 (1984-06-01), Mizuno et al.
patent: 4467176 (1984-08-01), Mizuno et al.
Shaw Clifford C.
Trempus Thomas R.
Westinghouse Electric Corp.
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