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金属熔焊成形三维温度场数值模拟与分析

李丙如,周建平,许燕,鲍阳

李丙如,周建平,许燕,鲍阳. 金属熔焊成形三维温度场数值模拟与分析[J]. 焊接学报, 2018, 39(3): 42-46. DOI: 10.12073/j.hjxb.2018390065
引用本文: 李丙如,周建平,许燕,鲍阳. 金属熔焊成形三维温度场数值模拟与分析[J]. 焊接学报, 2018, 39(3): 42-46. DOI: 10.12073/j.hjxb.2018390065
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LI Bingru, ZHOU Jianping, XU Yan, BAO Yang. Three-dimensional numerical simulation and analysis of temperature field in metal welding deposition prototyping[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(3): 42-46. DOI: 10.12073/j.hjxb.2018390065
Citation: LI Bingru, ZHOU Jianping, XU Yan, BAO Yang. Three-dimensional numerical simulation and analysis of temperature field in metal welding deposition prototyping[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(3): 42-46. DOI: 10.12073/j.hjxb.2018390065
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金属熔焊成形三维温度场数值模拟与分析

Three-dimensional numerical simulation and analysis of temperature field in metal welding deposition prototyping

摘要

    摘要
  • 摘要: 针对三维金属熔焊技术经历多次重叠热循环，层间等待时间直接影响成形质量和焊缝微观组织及可能引起的成形缺陷，建立了基于Sysweld求解器的单道多层直线往返堆积路径有限元模型，并进行加工试验验证. 结果表明，数值模拟技术可准确得到金属熔焊复杂的温度场及循环曲线，随层数的增加，热量累积，热源后方热影响区不断扩大，需设置层间等待时间保证成形质量. 等待时间大于30 s时，焊缝区经历明显的温度循环，成形质量较好. 等待时间越长，焊缝微观组织晶粒越均匀细密.
    Abstract: The forming quality, microstructures and corresponding forming defects in three-dimensional metal welding deposition are directly affected by the waiting time between layers because of the overlapping thermal cycles. Finite element models of single pass multilayer linear round-trip deposition based on SYSWELD solver were established. And experiments were conducted to verify the results. The results showed that the complex temperature field and thermal cycles of the welding deposition prototyping could be obtained accurately by numerical simulation method. As the layers increased, the heat accumulated gradually. Heat affected zone in the rear area of heat source enlarged constantly. Thus the waiting time between layers needed to be set. When the waiting time was greater than 30 s, the weld zone experienced a significant temperature cycle, and the forming quality was better. The microstructure was more uniform and fine with the increasement of the waiting time.
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  • 收稿日期:  2016-08-25

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