Electric heating – Metal heating – By arc
Patent
1977-08-08
1978-10-10
Truhe, J. V.
Electric heating
Metal heating
By arc
21913771, 2191377, B23K 910
Patent
active
041198301
ABSTRACT:
A two conductor, nonpolarized, low voltage control cable is used in conjunction with the single conductor welding cable to achieve excellent stability of wire feed motor speed without the use of silicon controlled rectifiers or other three terminal semiconductor devices. One conductor of the control cable is used as a ground return path for the wire feed motor. The voltage across the wire feed motor is the difference between the welding power supply voltage and a second control voltage which tracks variations in the power supply voltage due to fluctuations of the AC input to the system. When greater wire feed speeds are desired, the control voltage may be driven below ground and wire feed motor speed stability is obtained by operating the motor in a region where angular velocity is relatively insensitive to incremental changes in terminal voltage. When the control cable running from the power supply control circuitry to the remote unit is severed, it may be spliced without regard to polarity by the user.
REFERENCES:
patent: 2642515 (1953-06-01), Bagg
patent: 2857546 (1958-10-01), Lund
patent: 3180969 (1965-04-01), Williams
patent: 3213262 (1965-10-01), Marchland
patent: 3736403 (1973-05-01), Rogers et al.
patent: 3808397 (1974-04-01), Wixon
patent: 3849627 (1974-11-01), Blavier
Paschall M.
Truhe J. V.
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