Effects of heat source geometric parameters and arc efficiency on welding temperature field, residual stress, and distortion in thin-plate full-penetration welds
Effects of heat source geometric parameters and arc efficiency on welding temperature field, residual stress, and distortion in thin-plate full-penetration welds
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DOI：
10.1007/s00170-018-2516-6
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Jiamin Sun;J. Klassen;T. Nitschke–Pagel;K. Dilger
中科院分区：
文献类型：
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作者：
Jiamin Sun;J. Klassen;T. Nitschke–Pagel;K. Dilger
在弧焊数值模拟中，常用的是Goldak的双椭球体热源模型。在热分析中，通常需要对热源几何参数和电弧效率进行标定，直到得到与实验很好的吻合。然而，单个热源几何参数和电弧效率对焊接温度场、残余应力和变形的影响尚不清楚。本研究采用数值模拟和实验相结合的方法，系统地研究了薄板全熔透焊接过程中的这种影响。预测和测量结果表明，薄板全熔透焊缝热影响区边界位置和ΔT8/5时间仅受电弧效率(显著)和热源宽度(轻微)的影响。此外，电弧效率的变化对焊接残余应力和变形有显著影响，而热源几何参数的合理变化对焊接残余应力和变形的影响较小。提出了薄板全熔透焊接有限元模拟中热输入模型的标定方法。
The Goldak’s double-ellipsoid volumetric heat source model is commonly used for arc welding in numerical simulation. Usually, heat source geometric parameters and arc efficiency need to be calibrated in thermal analysis until a good agreement with experiments is achieved. However, the influence of individual heat source geometric parameters and arc efficiency on welding temperature field, residual stress, and distortion is still unclear. In this study, this influence has been systematically investigated in a thin-plate full-penetration weld by methods of both numerical simulation and experimental method. The predicted and measured results indicate that the location of HAZ boundary and the Δt8/5time can only be influenced by arc efficiency (significantly) and heat source width (slightly) in thin-plate full-penetration welds. Furthermore, the variation of arc efficiency can significantly affect welding residual stress and distortion, while the reasonable change of heat source geometric parameters has a slight effect. In this study, a calibration procedure of heat input model in FE simulation of thin-plate full-penetration welds is provided.