| 摘要: |
| 基于有限元ABAQUS软件,对390 mm厚20MnMoNb特厚板双U形坡口拼焊制造EO反应器管板过程进行焊接残余应力与变形有限元模拟,考察两面交替焊接时的翻转次数对特厚管板焊后残余应力与变形的影响.结果表明,特厚管板焊后发生一端翘起的角变形,在靠近表层的焊缝及热影响区存在较大的残余拉应力,在焊缝内部为残余压应力;随着翻转次数的增加,焊接残余应力和变形均降低,但当往返翻转次数超过7次后,进一步增加翻转次数对残余应力和变形的降低作用不明显. |
| 关键词: 特厚管板 焊接残余应力 变形 翻转次数 |
| DOI： |
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| 基金项目:国家"863"高科技资助项目(2009AA044803);江苏省工业装备数字制造及控制技术重点实验室开放研究基金(2010) |
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| Numerical analysis to study effect of turn number on residual stress and deformation of butt welded 20MnMoNb super-thick tube-sheet |
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WANG Yanfei1, GENG Luyang1, GONG Jianming1, JIANG Wenchun2
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1.College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;2.College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266555, China
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| Abstract: |
| The butt-welding process of 390mm 20MnMoNb super-thick plates for manufacturing the tube-sheet of a large scale ethylene oxide reactor was simulated by finite element program-ABAQUS.The residual stress and deformation in the welded tube-sheet are obtained.The welding grove was double U-shape and it was welded on both sides by turning over the tube-sheet continuously with a travelling crane.The effect of the turning numbers on the residual stress and deformation was investigated.The results show that angular deformation occurred in the tube-sheet and large tensile residual stresses is generated in the weld and the heat affect zone closed to the external surfaces of the tube-sheet, while compressive residual stress inside the tube-sheet.Both the residual stress and deformation decreased with the turning number increasing.When the turn number was above seven, the effect gets weakened gradually. |
| Key words: super-thick plate welding residual stress deformation turn number |
