レーザ外面加熱残留応力改善法（Ｌ‐ＳＩＰ）の施工管理範囲の検討　　‐レーザ外面加熱残留応力改善法（Ｌ‐ＳＩＰ）の開発‐

• 太田 高裕

  三菱重工業（株）技術本部高砂研究所

• 鴨 和彦

  三菱重工業（株）技術本部高砂研究所

• 室屋 格

  三菱重工業（株）技術本部高砂研究所

• 朝田 誠治

  三菱重工業（株）神戸造船所

• 中村 康夫

  三菱重工業（株）神戸造船所

書誌事項

タイトル別名

• Study on the Essential Variables for Pipe Outer Surface Irradiated Laser Stress Improvement Process (L-SIP) - Development of Pipe Outer Surface Irradiated Laser Stress Improvement Process (L-SIP) -
• Study on the Essential Variables for Pipe Outer Surface Irradiated Laser Stress Improvement Process (L-SIP)
• - Development of Pipe Outer Surface Irradiated Laser Stress Improvement Process (L-SIP) -
• －レーザ外面加熱残留応力改善法（L-SIP）の開発－

抄録

The new process called L-SIP (outer surface irradiated Laser Stress Improvement Process) is developed to improve the tensile residual stress of the inner surface near the butt welded joints of pipes in the compression stress. The temperature gradient occurs in the thickness of pipes in heating the outer surface rapidly by laser beam. By the thermal expansion difference between the inner surface and the outer surface, the compression stress occurs near the inner surface of pipes.<br>In this paper, the essential variables for L-SIP is studied by experimental and FEM analysis. The range of the essential variables for L-SIP, which are defined by thermo-elastic FEM analysis, are Tmax=550–650°C, L_Q/√rh ≥3, W_Q/√rh ≥1.7, and, 0.04≤F₀≤0.10 where Tmax is maximum temperature on the monitor point of the outer surface, F₀ is k×τ₀/<I>h², k is thermal diffusivity coefficient, τ₀ is the temperature rise time from 100°C to maximum temperature on the monitor point of the outer surface, W_Q is τ₀×v,υ is moving velocity, L_Q is the uniform temperature length in the axial direction, h is thickness of the pipe, and r is average radius of the pipe. It is showed by thermo-elastic-plastic FEM analysis that the residual stresses near the inner surface of pipes are improved in 4 different size pipes under the same essential variables. L-SIP is actually applied to welding joints of 4B×Sch160 and 2B×Sch80 SUS304 type stainless steel pipes within the defined range of the essential variables. The measured welding residual stresses on the inner surface near the welding joints are tensile. The residual stresses on the inner surface change to compression in all joints by L-SIP.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 27 (4), 343-351, 2009

  一般社団法人 溶接学会

キーワード

• Residual Stress
• Stainless Steel
• Laser
• Pipe
• Stress Improvement

詳細情報

• CRID: 1390001204727422080
• NII論文ID: 10030149579
• NII書誌ID: AN1005067X
• DOI: 10.2207/qjjws.27.343
• ISSN: 24348252
• ISSN: 02884771
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可