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以含有六个接管的1000MW级压水堆核电站反应堆压力容器中筒体与接管连接处马鞍形焊缝为研究对象,利用热弹塑性有限元数值模拟方法详细研究了不同焊接线能量下马鞍形焊接接头处温度场、残余应力场以及变形的大小和分布情况,并在焊后将构件进行高温回火处理,即整体加热到610℃保温3 h后空冷。结果表明,在满足焊接的条件下,2.57 kJ/mm的线能量焊后焊接残余应力和变形均小于线能量为2.75和2.89kJ/mm焊后,焊后热处理使得焊接残余应力和变形在一定程度上得到了改善。
The saddle-shaped weld at the connection between the cylinder and the receiver in the reactor pressure vessel of a 1000 MW PWR nuclear power station with six takeovers is taken as the research object. The saddle-shape weld with different welding line energies is studied in detail using the thermo-elasto-plastic finite element numerical simulation method. Joint temperature field, residual stress field and deformation of the size and distribution, and the components after welding high temperature tempering, that is, the overall heating to 610 ℃ insulation 3h air cooling. The results show that the welding residual stress and deformation under 2.57 kJ / mm are less than the line energy of 2.75 and 2.89 kJ / mm respectively after the welding is satisfied. The postweld heat treatment makes the welding residual stress and deformation to a certain extent On the improvement.