TURBINE ROTOR - MITSUBISHI HEAVY IND LTD

Title:

TURBINE ROTOR

Document Type and Number:

WIPO Patent Application WO/2013/129408

Kind Code:

A1

Abstract:

The purpose of the invention is to keep a rotor shaft from falling over after welding to improve the yield rate in a low-cost device, and to obtain a turbine rotor capable of large-scale production. A turbine impeller (12) and a rotor shaft (14) are rotated while fitted together at convex and concave parts (12a, 14a), a laser beam (L) is emitted in a circumferential direction from a laser beam generating device (30) onto a bonding surface (16), and the bonding surface (16) is welded. The laser beam (L) is then polarized, and a rotor shaft-side area (X) including the welded part is tempered by the laser beam (L). The tempering creates residual stress (R2) throughout the entire periphery, relative to the residual stress (R1) of localized angle distribution created during the welding. The post-cooling rotor shaft (14) is thereby kept from falling over.

Inventors:

OTSUBO HITOMI (JP)
ARAI TAKASHI (JP)
EBISU MOTOKI (JP)

Application Number:

PCT/JP2013/054987

Publication Date:

September 06, 2013

Filing Date:

February 26, 2013

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD (JP)

International Classes:

F02B39/00; B23K15/00; B23K15/04; B23K26/00; B23K26/20; B23K31/00; C21D9/00; C21D9/50

Domestic Patent References:

WO2006087074A1

2006-08-24

Foreign References:

JPH07286528A	1995-10-31
JP2009203807A	2009-09-10
JPH04167995A	1992-06-16
JPH07286528A	1995-10-31
JP2001254627A	2001-09-21

Other References: