Process for welding pipe ends and an insulating ring therefor

Details Process for welding pipe ends and an insulating ring therefor Process for welding pipe ends and an insulating ring therefor

1986-03-10

1987-01-06

Godici, Nicholas P.

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

228 59, 228222, 285 21, 285286, B23K 902

Patent

active

046340408

ABSTRACT:
An improvement is provided in a known process for welding liquid-filled aligned end sections of pipe. The known process involves positioning a sleeve over the junction between the pipe ends and fillet welding the two ends of the sleeve to the pipe ends. The improvement comprises providing an insulative ring within each pipe end directly beneath the line along which the sleeve's fillet weld is to be applied. The ring is composite in nature, being formed of a heat-insulating liquid-disintegratable material coated with a second material which is liquid-impermeable but slowly dissolvable in the pipe line liquid contents. The ring is operative to reduce the rate of heat transfer, from the weld area to the pipe line liquid, during welding. With a ring in place in each pipe end section, the engirdling sleeve is fillet welded to the pipe ends. Subsequently, the rings are disintegrated over time by the liquid. By slowing the rate of cooling of the weld and pipe wall in this fashion, embrittlement of the pipe wall adjacent the toe of the weld is avoided or reduced.

REFERENCES:
patent: 1990077 (1935-02-01), Kershaw
patent: 2173109 (1939-09-01), Hamblin
patent: 2320700 (1943-06-01), Kent
patent: 2409865 (1946-10-01), Jewell
patent: 2893758 (1959-07-01), Dufour
patent: 3736400 (1973-05-01), Spiegel
patent: 3873139 (1975-03-01), McCabe

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