Current control in an electron beam welder

Details Current control in an electron beam welder Current control in an electron beam welder

1975-12-15

1976-12-21

Truhe, J. V.

Electric heating

Metal heating

By arc

315306, B23K 1500

Patent

active

039990320

ABSTRACT:
A beam generating tube in a welder has an anode connected to ground potential and a cathode-Wehnelt electrode circuit connected across a portion of a voltage divider which is connected to a high voltage source. The voltage drop across the portion of the voltage divider is varied by means of a control tube connected in parallel with that portion, the voltage at the control electrode of the control tube being varied as a function of the difference between the actual beam current and the desired beam current as set externally. A diode is connected from the cathode of the beam generating tube to the voltage divider tap so that the voltage drop across the control tube is limited when the welder is not in operation and no current flows from the voltage divider tap to the control tube when the welder is in operation. When the difference between the actual beam current and the desired beam current exceeds a predetermined difference, the energization of the beam generating tube is interrupted.

REFERENCES:
patent: 3177434 (1965-04-01), Hansen
patent: 3454830 (1969-07-01), Ranby et al.
patent: 3678334 (1972-07-01), Dugdale et al.

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