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王俊恒, 张广军, 高洪明, 吴林. 镍基高温合金小截面方管焊接温度场的数值模拟[J]. 焊接学报, 2007, (7): 89-93.
引用本文: 王俊恒, 张广军, 高洪明, 吴林. 镍基高温合金小截面方管焊接温度场的数值模拟[J]. 焊接学报, 2007, (7): 89-93.
WANG Junheng, ZHANG Guangjun, GAO Hongming, WU Lin. Numerical simulation of welding temperature distribution for Ni-base superalloy little section square-tube[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (7): 89-93.
Citation: WANG Junheng, ZHANG Guangjun, GAO Hongming, WU Lin. Numerical simulation of welding temperature distribution for Ni-base superalloy little section square-tube[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (7): 89-93.

镍基高温合金小截面方管焊接温度场的数值模拟

Numerical simulation of welding temperature distribution for Ni-base superalloy little section square-tube

  • 摘要: 利用无接触简化模型进行小截面方管并行排列焊温度场的计算,模拟结果与测量结果的对比表明,此模型应用到小截面方管温度场的数值模拟中存在很大误差。从热和力的角度对小截面方管与胎具间的关系进行简单分析,解释了误差产生的原因。并以此为基础,建立了小截面方管并行排列焊的接触模型,采用直接约束法处理焊接过程中小截面方管与胎具的接触传热与受力问题,得到了焊接温度场的变化规律和分布情况。结果表明,在焊缝附近形成了一个"T"字形温度场;焊后冷却一段时间后,出现两端温度低、中间温度高的现象。这种情况与实际的焊接状况较一致。

     

    Abstract: The welding temperature field of Ni-based superalloy little-section rectangular tube is calculated by using non-contact model. After comparing the simulating results with the measuring ones it indicates big errors when applying this model to the temperature field of little section rectangular in welding simulation. By analyzing the relationship between little-section rectangular tube and welding positioner in the view of mechanic and thermal perspectives, the reason for the errors of simulating results is found out. Based on this reason, the contact model is presented. The heat transfer and stress analysis between little-section rectangular tube and welding positioner are simulated by using direct constraints method, and then the laws of the temperature distribution are gotten. The experimental results show that a "T" shaped temperature-field distribution is formed in the vicinity of the weld. After cooling for a period of time, the temperature distribution of the weldments shows that a lower temperature region exists at both ends, and a higher temperature region exists in the middle of the tube. The computed results are in good agreement with the erperimentally measured results.

     

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