WELDED PIPE AND PIPE WELDING METHOD

Title:

WELDED PIPE AND PIPE WELDING METHOD

Document Type and Number:

WIPO Patent Application WO/1996/034717

Kind Code:

A1

Abstract:

A welded pipe obtained by liquid-phase diffusion welding of pipes with an intermediate insert having a lower melting point than the pipes, wherein the joint has an increased outer diameter and a decreased inner diameter. A pipe welding method having the steps of abutting the ends of pipes with an intermediate insert having a lower melting point than the pipes, heating the abutted portion to a temperature above the melting point of the insert to diffuse the insert in liquid phase into the material of the pipes so as to weld the pipes, wherein an axial pressure is applied to cause plastic deformation at the joint heated to a temperature between the A1 transformation point and keeping temperature of the pipe material, so that the joint grows in thickness.

Inventors:

KISHI SHINSUKE (JP)
MAENOSONO TSUKASA (JP)
SATO MICHIO (JP)

Application Number:

PCT/JP1996/001198

Publication Date:

November 07, 1996

Filing Date:

May 01, 1996

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
KISHI SHINSUKE (JP)
MAENOSONO TSUKASA (JP)
SATO MICHIO (JP)

International Classes:

H05B6/10; B23K13/02; B23K20/00; B23K20/02; B23K20/16; B23K101/06; (IPC1-7): B23K20/00

Foreign References:

JPH0475773A	1992-03-10
JPS5662685A	1981-05-28
JPS54133450A	1979-10-17
JPH04135081A	1992-05-08
JPS50152954A	1975-12-09
JPH0275478A	1990-03-15

Other References: