Method for alignment of an electron beam to the adjacent faces o

Details Method for alignment of an electron beam to the adjacent faces o Method for alignment of an electron beam to the adjacent faces o

1983-11-14

1986-01-14

Albritton, C. L.

Electric heating

Metal heating

By arc

76108A, 219121EU, 219121EM, B23K 1500

Patent

active

045647380

ABSTRACT:
This invention relates to a method and apparatus for the alignment of a corpuscular beam, such as an electron or laser beam, to the abutting surfaces of stepped cylindrical segments whose abutting surfaces may be several inches in thickness, so that the beam will be directed along a path which includes all portions of the abutting surfaces to be joined by welding. The parts to be welded are segments of a stepped cylinder having sections of different radius. The parts to be welded are fixed to a table which can rotate the parts about a fixed axis about which the parts are positioned to form the cylinder. The coordinates at several points along the outer periphery of the joint to be welded are determined with respect to two mutually perpendicular axes, one of which is parallel to the axis about which the rotary table and cylinder rotate. By extrapolation of lines passing through these points, a determination is made by computer of the angular deviation of the plane of the joint from the axis of the rotatable table and its displacement from the axis. The electron beam gun is then caused to move along the two axes in such a way that the beam passes through the abutting surfaces of the segments to be welded.

REFERENCES:
patent: 3789185 (1974-01-01), Baldwin et al.
patent: 4098448 (1978-07-01), Sciaky et al.
patent: 4209684 (1980-06-01), Evans
Davis et al., "Hardware Technique for Processing EB Backscatter Signal for Registration", IBM Technical Journal, vol. 22, No. 3 1010-11, Aug. 1979.

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