METHOD OF RESISTANCE BUTT-WELDING OF PISTON WITH PLUGS Russian patent published in 2007 - IPC B23K11/02 G21C21/02 

FIELD: mechanical engineering; welding; nuclear engineering.

SUBSTANCE: invention relates to resistance butt-welding of tubular jackets of fuel elements with plugs. According to proposed method, end of pipe and end of plug are fixed in electrodes. Ends of pipe and plug whose outer diameter is greater than inner but smaller than outer diameter of pipe are compressed. Relative heating of pieces by welding current is carried out with subsequent driving plug into pipe. Welding is done mainly by heating of plug. Seating place is formed in process of displacement of plug between surface of its welded-in part and inner surface of pipe in direction of plug travel out of zone of thermal influence in pipe jacket. Larger part of fin formed at welding, and zone with maximum structural changes caused by thermal influence are brought outside. Zone with maximum structural changes is arranged out of zone of weld joint, and fin brought out is used to form smooth mating between outer surface of pipe and plug.

EFFECT: improved operating qualities of welded joints and their manufacturability.

1 ex, 2 dwg