FIELD: mechanical engineering; welding thick workpieces. SUBSTANCE: method comes to aiming electron beam 1 at butt 2 in point A located on surface of parts 3 and 4 to be welded close to datum step 5 and to moving parts 3 and 4 along axis X towards datum step 5. If electron beam deflects from datum step butt, electron beam gun is adjusted to align beam with point A and butt of datum step. EFFECT: increased accuracy of electron beam aiming when welding joints with thickness not less than 30 mm. 1 dwg, 1 tbl
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