Electric heating – Metal heating – By arc
Patent
1974-03-11
1976-01-20
Truhe, J. V.
Electric heating
Metal heating
By arc
219135, B23K 912
Patent
active
039341100
ABSTRACT:
A system and method for controlling a welding program during arc initiation wherein the output current of a welding power supply is dropped in manner such that the generator excitation is limited, or the diode of a rectified machine is controlled, as the case may be, accordingly as the electrode or weld wire is motivated downwardly via a feed motor toward a work or cooperating electrode under a condition of low voltage and no current drain, to the end of precluding sticking or adhering of the electrode to the work upon initial contact therewith. Upon contact, and with generator current output at such a minimal value that the electrode will not adhere, a relay becomes deenergized closing other relays and thereby switching the motor so as to be driven in the reverse or up direction at a preset speed and simultaneously reestablishing the full generator output and switching to a sensing circuit for controlling the feed motor drive. This reverse motion stops when the arc voltage reaches a preset welding value. A motor reversal in the form of another downward motion follows a sensing of the attainment of the desired welding voltage with the running speed of the motor being controlled so as to match the desired burn off rate of the electrode. By means of a push button or limit switch or similar stop system, the motor is stopped and the welding current is simultaneously reduced to a nominal value so that continued burn off is precluded. The operation of the power supply involves a safety feature in that at no time is the open circuit voltage allowed to exceed a maximum of 40 volts. The open circuit voltage approximates 20-25 volts as compared to conventional use where the open circuit voltage is from 100 to 125 volts, obviously more of a hazard.
REFERENCES:
patent: 2468570 (1949-04-01), Nyburg
patent: 2752469 (1956-06-01), Price
patent: 2759120 (1956-08-01), Cornell
patent: 2832000 (1958-04-01), Steele
patent: 3141085 (1964-07-01), Manz
Shaw Clifford C.
Truhe J. V.
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