PURPOSE: To provide the local vacuum chamber forming method and electron beam welding equipment in electron beam welding capable of sealing between two strips of different strip thickness/strip width an a vacuum welding chamber is enabled and holding a strip very near weld line. ;CONSTITUTION: The vacuum welding chamber 5 to execute electron beam welding consists of an upper vacuum vessel 3 which is provided with preliminary evacuation chambers 6-9 which extend along weld line so as to enclose periphery of weld zone of strip 1, 2 and are at least one in the trip width and longitudinal direction, and elastic sealing material 10, 10' between chambers 6-9 and opens its lower side and a lower vacuum vessel 4 which is symmetrical to the upper vessel and opens its upper side. In butt welding the strips 1, 2, the gas flowed in from the strip end gap part, which is formed at sandwiching the strips 1, 2 with the upper vacuum vessel 3 and lower vacuum vessel 4, is sucked by one preliminary evacuation chamber at least, vacuum zone is formed around weld zone and then welding is executed.;COPYRIGHT: (C)1996,JPO
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