PURPOSE: To seal surely a vacuum chamber for welding with a simple mechanism in an electron beam welding device, by using a slide sheet of specific construction between a moving electron gun and the vacuum chamber.
CONSTITUTION: A packing 10 having many through-holes 10c in the cylindrical part 10b between lips 10a adjacent to a slide seal 3 having roughly an X shape in section is disposed in the packing groove 11 formed by enclosing an electron beam passage hole 6 on the top surface of a vacuum chamber 1 in the stage of welding the objects 8 to be welded in the chamber 1 with the electron beam B from a movable electron gun 2 in the upper part of the vacuum chamber. An evacuation hole 12 for double-stage evacuation is provided successively with the groove 11 and through the holes 10c of the packing 10; further, a fixing pin 13 for packing which prevents the movement of the packing 10 in the groove 10 by its sliding resistance is inserted into the holes 10c and the hole provided in the groove 11. The vacuum chamber is sealed during electron beam welding with the simple sealing mechanism.
YASUNAGA MASASHI
MORI DAISUKE
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