5A90铝锂合金T形接头激光填丝焊接头组织性能分析
Microstructure and properties of 5A90 Al-Li alloy T-joints by laser welding with filler wire
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摘要: 对2.5 mm厚5A90铝锂合金T形接头激光焊和激光填丝焊接头组织与性能进行了研究.结果表明,与不填丝相比,焊接过程中填充焊丝有效减少角焊缝咬边、下塌等缺陷,明显改善焊缝表面成形,同时增大了接头熔化区面积,提高了激光的吸收率;填丝还使得T形接头两侧角焊缝组织大小趋于相同,但组织相对粗大;接头抗拉强度接近提高20%,拉伸断口呈韧性断裂.Abstract: The microstructure and mechanical properties of 5A90 Al-Li alloy T-joints by laser welding with and without filler wire were investigated.The results show that laser welding with filler wire could reduce the undercut and collapse defects, and improve the weld surface forming.Meanwhile,laser welding with filler wire could also increase the area of fusion zone and enhance the laser absorption rate.Laser welding with filler wire could homogenize the weld microstructure on both sides of the Tjoint, although the grains were coarsened.However,the tensile strength of the joint increased by nearly 20% and the fractured surface revealed ductile features.
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Key words:
- T-joint /
- laser welding /
- laser welding with filler wire /
- 5A90 Al-Li alloy /
- tensile property
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