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Development of Outer Surface Irradiated Laser Stress Improvement Process (L-SIP)

[+] Author Affiliations
Noriaki Sugimoto, Hironori Onitsuka, Koji Okimura

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Takahiro Ohta, Kazuhiko Kamo

Mitsubishi Heavy Industries, Ltd., Takasago, Hyogo, Japan

Paper No. ICONE14-89375, pp. 175-178; 4 pages
  • 14th International Conference on Nuclear Engineering
  • Volume 1: Plant Operations, Maintenance and Life Cycle; Component Reliability and Materials Issues; Codes, Standards, Licensing and Regulatory Issues; Fuel Cycle and High Level Waste Management
  • Miami, Florida, USA, July 17–20, 2006
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4242-8 | eISBN: 0-7918-3783-1
  • Copyright © 2006 by ASME


Improvement of residual stress is effective in a countermeasure to deal with the stress corrosion cracks in pipe welds. A irradiated laser stress improvement process (L-SIP) will be introduced as a method to improve residual stress inside steel pipes. This work method is to improve inner surface residual stress from tensile stress to compressive stress by irradiating laser beam around the welds of steel pipe and utilizing the temperature differences between inner and outer surface.

Copyright © 2006 by ASME
Topics: Lasers , Stress



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