System and method for processing a work piece by a focussed elec

Details System and method for processing a work piece by a focussed elec System and method for processing a work piece by a focussed elec

1983-07-29

1986-05-27

Albritton, C. L.

Electric heating

Metal heating

By arc

219121ED, 219121EM, B23K 1500

Patent

active

045916888

ABSTRACT:
A welder utilizes a focussed electron beam which is deflected along the processing path required to weld two pieces together and is also oscillated about the processing path in accordance with a modulation curve. The modulation curve is approximated by a sequence of points. The coordinates of the points in a predetermined coordinate system are read out sequentially from a digital storage and converted to analog signals. The analog signals are subjected to low pass filtering and then applied to the deflection system for the electron beam. The cut-off frequency of the low pass filter is a predetermined multiple of the readout frequency of the digital data. When the velocity of the beam along the modulation curve changes, the cut-off frequency and the readout frequency are adjusted simultaneously. Additionally, the position of the focus and/or the intensity of the electron beam can be varied as the beam traces out the modulation curve. The point-by-point approximation of the modulation curve allows a wide latitude of choice in determining the shape of the curve and the velocity of the electron beam.

REFERENCES:
patent: 4179316 (1979-12-01), Connors et al.
Metals Handbook, vol. 6, 8th Edition, "Electron Beam Welding", .COPYRGT.1971, pp. 547-549.

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