Scholarlink

<p>To investigate the effect of marine atmospheric environments on the properties of 2A14 aluminum alloy TIG-welded joints, this study conducted 12-month natural exposure tests in a gradient environment at distances of 200&#xa0;m (Site A), 450&#xa0;m (Site B), and 12&#xa0;km (Site C) from the coastline. Combined with macro-microscopic observation and mechanical property testing, the corrosion behavior and performance evolution law were systematically analyzed. The results show that the corrosion degree of the HAZ is significantly higher than that of the WZ, and the corrosion depth increases remarkably with the enhancement of environmental aggressiveness, following a nonlinear growth trend conforming to a power-law function. Long-term exposure leads to a significant decrease in the yield strength, tensile strength, and elastic modulus of the joints; with the most prominent reductions at Site A, reaching 7.22%, 7.59%, and 7.02%, respectively. Meanwhile, the hardness exhibits environment-dependent attenuation, with the most obvious softening at Site A. Marine atmospheric corrosion promotes the continuous release of residual stress in the HAZ, with a 19.0% reduction observed at Site A after 12&#xa0;months. SEM fractography analysis indicates that with the intensification of corrosion, the ductility of the joints gradually decreases, characterized by shallower dimples with poor uniformity. This study clarifies the correlation mechanism between the gradient marine atmospheric environment and the multi-scale degradation of welded joints, providing direct data support for the safe service and protection design of aluminum alloy-welded structures in marine environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of Gradient Marine Atmospheric Exposure on Mechanical Properties and Residual Stress of 2A14 Aluminum Alloy Tungsten Inert Gas-Welded Joints

  • 期刊论文

  • 发表日期：

    2026年3月28日

查看全文
  • Hang Su,
  • Wei Liu,
  • Xuefeng Yao

摘要

To investigate the effect of marine atmospheric environments on the properties of 2A14 aluminum alloy TIG-welded joints, this study conducted 12-month natural exposure tests in a gradient environment at distances of 200 m (Site A), 450 m (Site B), and 12 km (Site C) from the coastline. Combined with macro-microscopic observation and mechanical property testing, the corrosion behavior and performance evolution law were systematically analyzed. The results show that the corrosion degree of the HAZ is significantly higher than that of the WZ, and the corrosion depth increases remarkably with the enhancement of environmental aggressiveness, following a nonlinear growth trend conforming to a power-law function. Long-term exposure leads to a significant decrease in the yield strength, tensile strength, and elastic modulus of the joints; with the most prominent reductions at Site A, reaching 7.22%, 7.59%, and 7.02%, respectively. Meanwhile, the hardness exhibits environment-dependent attenuation, with the most obvious softening at Site A. Marine atmospheric corrosion promotes the continuous release of residual stress in the HAZ, with a 19.0% reduction observed at Site A after 12 months. SEM fractography analysis indicates that with the intensification of corrosion, the ductility of the joints gradually decreases, characterized by shallower dimples with poor uniformity. This study clarifies the correlation mechanism between the gradient marine atmospheric environment and the multi-scale degradation of welded joints, providing direct data support for the safe service and protection design of aluminum alloy-welded structures in marine environments.