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基于ANSYS有限元分析软件,建立了SA335-P92钢管的局部焊后热处理有限元模型,对焊后热处理的温度场进行了模拟,并将模拟结果与试验结果进行了对比,分析了加热、保温、冷却不同阶段接头附近的温度场分布。结果表明,在P92钢管焊后热处理过程中,轴向方向上加热区域始终保持最高温度,保温区次之,而自然对流区温度较低;随着距焊缝中心轴向距离的增加温度逐渐降低。温度场模拟值与实测值较为吻合,表明建立的有限元模型可用于焊后热处理温度场模拟。在加热阶段,加热区域温度升高速率最快,保温区次之,自然对流区由于散热较快,温度升高速率较慢;保温阶段,随着保温时间的延长,钢管轴向温差和焊缝中心内外壁温差均逐渐减小。
Based on the finite element analysis software ANSYS, the finite element model of SA335-P92 steel pipe after partial post-weld heat treatment was established. The temperature field of post-weld heat treatment was simulated. The simulation results and experimental results were compared. The effects of heating, Cooling temperature distribution near the joint in different stages. The results show that in the post-weld heat treatment of P92 steel pipe, the maximum heating temperature in the axial direction is always maintained, followed by the heat preservation zone, while the temperature in the natural convection zone is lower; as the axial distance from the weld center increases, the temperature gradually decreases . The simulation results of the temperature field are in good agreement with the measured values, indicating that the established finite element model can be used to simulate the temperature field of the post-weld heat treatment. In the heating stage, the rate of temperature rise in the heating zone is the fastest, the temperature holding zone is second, and the cooling zone in the natural convection zone is fast and the rate of temperature increase is relatively slow. During the heat preservation phase, with the increase of holding time, Center temperature difference between the outer wall are gradually reduced.