METHOD FOR CONTACT-BUTT WELDING OF PIPE WITH PLUG Russian patent published in 2010 - IPC B23K11/02 B23K11/10 B23K31/02 G21C3/10 G21C21/00 

FIELD: welding works.

SUBSTANCE: invention is related to method of contact-butt welding of pipe with plug and may find application in manufacturing of rod fuel elements of nuclear plants. Method includes placement and fixation of pipe end with deepening in welding auxiliaries. Heating of pipe end and plug pressed by butts by welding current, at that plug has section welded into pipe wall, with diametre that is larger than internal one, but is less than external diametre of pipe, and further welding of plug into pipe wall with alternating speed of plug motion. Pipe end on section with length of 1.5-3 of pipe wall thickness is placed on section of welding auxiliaries, electric resistance of which is less than resistance of pipe section material in zone of welding. Heating of pipe end and plug pressed by butts by welding current is carried out due to contact resistance in butt between end of pipe and plug and area of welding current supply into pipe, which is arranged at the distance equal to 1.5-3 of pipe wall thickness from its end. Besides heating of welded parts in process of welding to arrange zone of thermal effect, which is common in length of welded joint with width in central part of welded joint, which is equal to 0.1-3 of pipe wall thickness.

EFFECT: simplified welding technology without deterioration of quality properties of welded joints.

2 cl, 3 dwg, 1 ex