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动态预热对激光焊接接头热行为及力学性能的影响

Effect of Dynamic Preheating on the Thermal Behavior and Mechanical Properties of Laser-Welded Joints.

作者信息

Xie Linyi, Shi Wenqing, Wu Teng, Gong Meimei, Cai Detao, Han Shanguo, He Kuanfang

机构信息

School of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China.

Guangdong Provincial Key Laboratory of Advanced Welding Technology, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China.

出版信息

Materials (Basel). 2022 Sep 5;15(17):6159. doi: 10.3390/ma15176159.

DOI:10.3390/ma15176159
PMID:36079554
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457888/
Abstract

The high cooling rate and temperature gradient caused by the rapid heating and cooling characteristics of laser welding (LW) leads to excessive thermal stress and even cracks in welded joints. In order to solve these problems, a dynamic preheating method that uses hybrid laser arc welding to add an auxiliary heat source (arc) to LW was proposed. The finite element model was deployed to investigate the effect of dynamic preheating on the thermal behavior of LW. The accuracy of the heat transfer model was verified experimentally. Hardness and tensile testing of the welded joint were conducted. The results show that using the appropriate current leads to a significantly reduced cooling rate and temperature gradient, which are conducive to improving the hardness and mechanical properties of welded joints. The yield strength of welded joints with a 20 A current for dynamic preheating is increased from 477.0 to 564.3 MPa compared with that of LW. Therefore, the use of dynamic preheating to reduce the temperature gradient is helpful in reducing thermal stress and improving the tensile properties of the joint. These results can provide new ideas for welding processes.

摘要

激光焊接（LW）快速加热和冷却的特性所导致的高冷却速率和温度梯度，会在焊接接头中产生过大的热应力，甚至出现裂纹。为了解决这些问题，提出了一种动态预热方法，即采用激光电弧复合焊接，在激光焊接中添加辅助热源（电弧）。利用有限元模型研究动态预热对激光焊接热行为的影响。通过实验验证了传热模型的准确性。对焊接接头进行了硬度和拉伸试验。结果表明，采用合适的电流可显著降低冷却速率和温度梯度，这有利于提高焊接接头的硬度和力学性能。与激光焊接相比，动态预热电流为20 A时焊接接头的屈服强度从477.0 MPa提高到564.3 MPa。因此，采用动态预热来降低温度梯度有助于降低热应力并改善接头的拉伸性能。这些结果可为焊接工艺提供新思路。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/6f568bfc8dc9/materials-15-06159-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/6f568bfc8dc9/materials-15-06159-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/0119cc6181e7/materials-15-06159-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/96ea8c79de67/materials-15-06159-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/99b93f839231/materials-15-06159-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/8e4734dcbf6c/materials-15-06159-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/9f2e676ab1ea/materials-15-06159-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/16f5faf5584e/materials-15-06159-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/955d/9457888/6f568bfc8dc9/materials-15-06159-g013.jpg

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本文引用的文献

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Numerical Investigation of Degradation of 316L Steel Caused by Cavitation.空化作用导致316L钢降解的数值研究。
Materials (Basel). 2021 Jun 7;14(11):3131. doi: 10.3390/ma14113131.
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Direct measurements of temperature-dependent laser absorptivity of metal powders.金属粉末与温度相关的激光吸收率的直接测量。
Appl Opt. 2015 Aug 20;54(24):7230-3. doi: 10.1364/AO.54.007230.