Pipe joints or couplings – Molded joint – Interlocked
Patent
1979-01-24
1982-09-07
Arola, Dave W.
Pipe joints or couplings
Molded joint
Interlocked
285 41, 285422, 228225, 228189, F16L 1304
Patent
active
043480411
ABSTRACT:
A butt welded tubular structure composed of tubular members of austenite stainless steel including a restraining member providing a cover to the entire outer circumferential surfaces of a welded joint and heat affected zones of the tubular members, the restraining member being formed of a metal or alloy of lower stress corrosion cracking sensitivity than the material of the tubular members and joined at the entire surfaces of opposite end portions thereof to the tubular members by welding, although the restraining member is not joined to the tubular members at portions of the restraining member corresponding to the welded joint and heat affected zones of the tubular members. The butt welded tubular structure is produced by joining tubular members of austenite stainless steel by butt welding, covering the entire outer circumferential surfaces of the welded joint and heat affected zones of the tubular members with a restraining member formed of a metal or alloy of lower stress corrosion cracking sensitivity than the material of the tubular members, and joining by welding the entire surfaces of opposite end portions of the restraining member to the tubular members while avoiding the joining of the restraining member to the welded joint and heat affected zones of the tubular members at portions of the restraining member corresponding to the welded joint and heat affected zones.
REFERENCES:
patent: 1613461 (1927-01-01), Johnson
patent: 3774296 (1973-11-01), Clay
patent: 4049186 (1977-09-01), Hanneman
patent: 4132343 (1974-01-01), Kullendorff
Chiba Yochiteru
Imai Katsuyuki
Itow Hisao
Kanno Masayoshi
Kuniya Jiro
Arola Dave W.
Beall, Jr. Thomas E.
Hitachi , Ltd.
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