Method of treating a workpiece with electron beams and apparatus

Electric heating – Metal heating – By arc

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219121EL, 219121ES, 219121EX, B23K 1500

Patent

active

043272738

ABSTRACT:
A vacuum chamber for welding in which to place a workpiece is hermetically connected to a vacuum chamber for an electron beam gun in which to place an electron beam gun, and the former is kept at a vacuum of 1.times.10.sup.-4 Torr while the latter, at a vacuum of 1.times.10.sup.-6 Torr. The distance between the electron beam gun and the surface of the workpiece is made greater than the mean free path of gas molecules and metal vapor molecules generated in treating, e.g., 1.85 m. Two focusing coils are arranged to prevent the expansion of the electron beams.

REFERENCES:
patent: Re27005 (1970-12-01), Wingfield et al.
patent: 3082316 (1963-03-01), Greene
patent: 3378670 (1968-04-01), Smith et al.
patent: 3417222 (1968-12-01), Cannon et al.
patent: 3479483 (1969-11-01), Boring et al.
patent: 3483350 (1969-12-01), Pohl
patent: 3617686 (1971-11-01), Dietrich
patent: 3857041 (1974-12-01), Spicer

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