Study on the Influence of Softening Behavior of High Magnesium Aluminum Alloy Welded Joint on Welding Residual Stress

doi:10.3901/JME.260116

Abstract

Abstract: In the high magnesium aluminum alloy welding process, due to the large heat input, welding joints often show softening phenomena. In order to study the softening mechanism of high magnesium aluminum alloy welding joints and the influence of softening behavior on welding residual stresses, microhardness tests were conducted on the welding joints, and softening of different degrees was found in the weld zone and heat-affected zone. Microscopic characterization revealed that the main reason for this phenomenon was the weakening of dispersion strengthening and solute strengthening. By analyzing the trend of hardness change and combining finite element simulation of temperature field during welding process, a softening model that is affected by welding peak temperature was established. This softening model was applied to the calculation of stress field and compared with the measured welding residual stress value by blind hole method. The results show that when considering the softening model, the residual stress in the weld zone and heat-affected zone decreases to different degrees, and the calculated welding residual stress value considering the softening model is closer to the measured value than the experimental measurement value.

Key words: high magnesium aluminum alloy, solid solution strengthening, dispersion strengthening, softening model, welding residual stress, finite element simulation

CLC Number:

TG404

ZHENG Wenjian, HU Minghui, YU Yang, FENG Daochen, YAN Dejun, YANG Jianguo. Study on the Influence of Softening Behavior of High Magnesium Aluminum Alloy Welded Joint on Welding Residual Stress[J]. Journal of Mechanical Engineering, 2026, 62(4): 180-189.

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