Title:
WELDED-JOINT STRUCTURE IN THICK-WALLED LARGE-DIAMETER PIPE, AND WELDING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2015/076218
Kind Code:
A1
Abstract:
A pair of thick-walled large-diameter base pipes (1) constituted of an Ni-based alloy which comprises, in terms of wt%, 20-35% Cr, 0.1-10% Mo, 0.1-3% Al, 0.11-3% Ti, and Ni as the remainder and intermediate pieces constituted of the same material and having a width of about 60 mm are subjected beforehand to hot working or cold working, thereby giving a solution treatment to a range including portions to be finally welded on a site where at least a boiler has been installed. Thereafter, the intermediate pieces are finally welded to each other on the site where a boiler has been installed. With this method, it is possible to obtain a highly reliable welded-joint structure in a thick-walled large-diameter pipe.
Inventors:
TOKAIRIN TSUYOSHI (JP)
SATO TAKASHI (JP)
SATO TAKASHI (JP)
Application Number:
PCT/JP2014/080339
Publication Date:
May 28, 2015
Filing Date:
November 17, 2014
Export Citation:
Assignee:
MITSUBISHI HITACHI POWER SYS (JP)
International Classes:
B23K9/23; B23K9/00; B23K9/028; B23K31/00; C22C19/05; F22B37/04
Foreign References:
| JP2013217454A | 2013-10-24 | |||
| JP2010007873A | 2010-01-14 | |||
| JPH05212538A | 1993-08-24 | |||
| JP2005274022A | 2005-10-06 |
Attorney, Agent or Firm:
KAMEI, Takeyuki et al. (JP)
Takayuki Kamei (JP)
Takayuki Kamei (JP)
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