Setting the electron gun cathode heating current of an electron

Details Setting the electron gun cathode heating current of an electron Setting the electron gun cathode heating current of an electron

1979-10-10

1982-03-02

Rubinson, Gene Z.

Electric heating

Metal heating

By arc

219121EM, 315106, H05B 3904, H05B 4136, B23K 1500

Patent

active

043179835

ABSTRACT:
In an electron beam machine for e.g. beam welding, the beam current I.sub.em is stabilized by negative feedback applied to the grid of the electron gun. The optimum cathode heating current is ascertained by causing the cathode heating current I.sub.H to decrease steadily from a maximum value. The beam current is kept constant by the feedback, which adjusts the grid voltage U.sub.W to offset the decrease in cathode temperature caused by the decreasing heating current; the rate of change of the grid voltage U.sub.W is monitored, and when this rate of change exceeds a threshold, the decrease in heating current is arrested, and the heating current is maintained at the thus established optimal value or preferably set at a slightly higher value, which secures an extended length of life of the cathode. This setting of the cathode heating current is repeated after a predetermined interval of time to establish a new value in response to a change of the condition of the cathode.

REFERENCES:
patent: 3413517 (1968-11-01), Barber et al.
patent: 3699381 (1972-10-01), Kondo et al.
patent: 3760279 (1973-09-01), Rudolph
patent: 3838313 (1974-09-01), Anderson
patent: 3875366 (1975-04-01), Von Walter
patent: 4021636 (1977-05-01), Von Walter
Avt. Svarka., 1969, No. 2 pp. 51-55, "A New 13.5 kw Electron Beam Welding Apparatus" by O. K. Nazarenko et al.

Affiliated with

Also associated with

Rating

Setting the electron gun cathode heating current of an electron does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Setting the electron gun cathode heating current of an electron , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Setting the electron gun cathode heating current of an electron will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-60902