2A14铝合金高拘束应力多层多道TIG焊缝断裂行为研究

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Abstract： TIG double-sided thre-layer welding process tests were conducted on 5mm thick 2A14 aluminum aly circular restrained welds.The weld composition was analyzed using EDS，and the weld zones were classified based on the compositional results.Fracture locations were observed，and stress simulations were performed on the welds. Residual stresstesting wasalso carred out. Observations and tests revealed that，compared to traditionalbutt joints， high-restraint-stress multi-layerand multi-passweldingundergoes dual thermo-mechanical effects， with fractures occurring atthe weld fusion line.Tensile test results of the welded joints showedreductions inboth tensile strength and elongation; however，the fracture surfaces stillexhibited characteristics of plastic fracture.

Keywords：2A14; high restraint; multi-layer and multi-pass welding; thermo-mechanical; fusion line

1序言

2A14-T6属于A1-Cu-Mg-Si系析出强化型高强铝合金，是我国目前运载火箭贮箱所用的主要材料之二[-3]，其焊接接头的安全服役，是设计、制造中必须面对的问题。（剩余4716字）