Title:
HEAT TREATMENT METHOD FOR BRANCH PIPE WELDED PORTION
Document Type and Number:
WIPO Patent Application WO/2012/039273
Kind Code:
A1
Abstract:
In a heat treatment method, using a bonded joint (31) for bonding a small bore pipe (12) having a diameter of 200 mm or less and a thickness of 15 mm or less to a larger bore pipe (10), after the small bore pipe (12) and the bonded joint (31) are welded to each other and then the vicinity of the welded portion is heated, the pipe inner surface is cooled by a refrigerant. The heat treatment method is characterized in that the distance between a heating range and the large bore pipe (10) is 70 mm or more. This provides a heat treatment method capable of reducing tensile residual stress caused by welding or processing of a pipe.
Inventors:
TSURUKI MASAKI (JP)
AOIKE SATORU (JP)
ORITANI NAOHIKO (JP)
FUKUDA YUKA (JP)
AOIKE SATORU (JP)
ORITANI NAOHIKO (JP)
FUKUDA YUKA (JP)
Application Number:
PCT/JP2011/070195
Publication Date:
March 29, 2012
Filing Date:
September 05, 2011
Export Citation:
Assignee:
HITACHI LTD (JP)
TSURUKI MASAKI (JP)
AOIKE SATORU (JP)
ORITANI NAOHIKO (JP)
FUKUDA YUKA (JP)
TSURUKI MASAKI (JP)
AOIKE SATORU (JP)
ORITANI NAOHIKO (JP)
FUKUDA YUKA (JP)
International Classes:
B23K31/00; C21D9/08; C21D9/50
Foreign References:
| JPH03285021A | 1991-12-16 | |||
| JPS60255930A | 1985-12-17 | |||
| JPH01165724A | 1989-06-29 | |||
| JPH0639951U | 1994-05-27 | |||
| JPS5494415A | 1979-07-26 | |||
| JP4196755B2 | 2008-12-17 | |||
| JP2005320626A | 2005-11-17 |
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
Kasuga 讓 (JP)
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Claims:
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