To provide a residual stress improvement method capable of simply, quickly and surely improving a residual stress in a tubular body by reducing the residual stress in a tensile state by heating the tubular body or making the body to a compressing state.
This method comprises: an irradiating process with laser beam Lz to a stress improving range Sr desirable to improve the residual stress in the tubular body Pi; a temperature measuring process for measuring the temperature in the stress improving range Sr; a cooling process for stopping the irradiation with the laser beam and cooling after becoming a prescribed temperature difference to the inner and the outer surfaces of the stress improving region Sr; and a moving process for moving the laser beam Lz in the stress improving region Sr to the non-irradiation portion in a laser beam irradiation part 1 after completing the cooling process.
COPYRIGHT: (C)2005,JPO&NCIPI
Risuke Nayama
Takashi Ishide
Yasuyuki Fujitani
Hidemine Tsubota
Tsuyoshi Yamamoto
Yu Taniguchi
Takashi Akabane
Yoshiyuki Kondo
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Tadahiro Mitsuishi
Yasuyuki Tanaka
Hiroshi Matsumoto