REHEATING METHOD FOR RAIL WELD PARTS

WIPO Patent Application WO/2012/161207

A1

[Problem] To obtain a welding joint that has superior fatigue strength that can suppress fatigue cracks in the horizontal direction in the column part and bending fatigue cracks starting from the foot part in rail welding parts. [Solution] In a reheating method for rail weld parts after rail welding, the distance (C) between a reheating area (P) for the rail column part (2) and the weld center (Q) is set to 0.2 - 3 times the weld part HAZ length (Lh). The length (B) of the reheating area (P) can be 0.5 - 5 times the weld part HAZ length (Lh). The height (A) of the reheating area (P) can be 0.2 or more times the height of the rail column part (2). The temperature (Th) achieved in reheating at the center of the reheating area (P) can be 400 - 750°C and, furthermore, in relation to the initial temperature (Tw) (°C) of the weld part during reheating, can satisfy 0.375Tw + 350 ≤ Th ≤ 0.5Tw + 600.

KARIMINE KENICHI (JP)
UEDA MASAHARU (JP)
IWANO KATSUYA (JP)
TOTTORI HIDEO (JP)
YAMAMOTO TAKESHI (JP)

PCT/JP2012/063147

November 29, 2012

May 23, 2012

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NIPPON STEEL & SUMITOMO METAL CORP (JP)
KARIMINE KENICHI (JP)
UEDA MASAHARU (JP)
IWANO KATSUYA (JP)
TOTTORI HIDEO (JP)
YAMAMOTO TAKESHI (JP)

B23K31/00; C21D9/04; C21D9/50; B23K101/26; C21D1/30; C22C38/00; C22C38/04; C22C38/50

WO2010116680A1

2010-10-14

JPH08337819A	1996-12-24
JPS5993837A	1984-05-30
JPS58153731A	1983-09-12
JP2010000543A	2010-01-07

KAMEYA, Yoshiaki et al. (JP)
Yoshiaki Kameya (JP)

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