FIELD: process engineering.
SUBSTANCE: invention may be sued for sealing nuclear reactor jacketed rod-type fuel elements by resistance butt welding. Circular plug-in current contact jaw made up of metal plates stacked in isolating case is arranged between main jaw and stiffness washer. Said stack is arranged to make welding current distribution zone. Said stiffness washer is fitted to make weld joint forming zone in area of its contact with tube outer surface that features electrical resistance smaller than that of adjoining welding current distribution zone. Width of said forming zone makes 1.5-3 thicknesses of tube wall. Relation between the width of current distribution zone and that of forming zone does not exceed unity.
EFFECT: stable quality of weld joints.
3 dwg
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