Improvement in tensile properties of 2219-T8 aluminum alloy TIG welding joint by PMZ local properties and stress distribution
Improvement in tensile properties of 2219-T8 aluminum alloy TIG welding joint by PMZ local properties and stress distribution
复制标题
DOI：
10.1016/j.msea.2022.142863
复制
发表时间：
2022-02-26
期刊：
影响因子：
6.4
通讯作者：
Wang, Guoqing
中科院分区：
文献类型：
--
作者：
Wan, Zhandong;Wang, Qiang;Wang, Guoqing
2219-T8铝合金TIG焊接接头的拉伸性能受焊趾处的局部熔化区和应力集中的严重制约。在这项工作中，PMZ的局部性能提高细化晶粒尺寸和θ相颗粒在基体金属。并采用摆动三道焊的方法调整焊趾处的应力集中。结果表明，由于基体中Cu含量的增加，粗晶和连续共晶的减少，PMZ的抗拉强度提高了-16-21 MPa。通过改善PMZ局部性能和匹配合适的应力分布，接头抗拉强度达到-318MPa（提高-10%），延伸率达到-5.8%（提高-26%）。
Tensile properties of 2219-T8 aluminum alloy TIG welding joints were seriously restricted by partially melted zone (PMZ) properties and stress concentration at weld toe. In this work, PMZ local properties were enhanced by refining grains size and theta phase particles in base metal. And the stress concentration at weld toe was adjusted using three-pass welding with swing. The results showed that tensile strength of PMZ was increased by -16-21 MPa, due to the higher Cu content of matrix, as well as reduced coarse and continuous eutectic. The joint tensile strength of -318 MPa (-10% increase) and elongation of -5.8% (-26% increase) were obtained by improving PMZ local properties and matching proper stress distribution.