摘要: |
通过对TC4板材进行两种T型接头的激光焊接试验,分析了酸洗、焊接环境及焊后修复对钛合金激光焊接接头质量的影响,实验结果表明,钛合金激光焊具有较强的气孔倾向,酸洗及焊后重熔并未明显改善接头气孔的情况,但气孔数量对湿度的变化较为敏感。不同焊接试验的结果统计表明,虽然接头存在大量气孔,但只有位于上下两侧板材的贴合面处的这一小部分气孔才会造成受力面积的减小,因此接头整体仍具有较高的抗剪力。 |
关键词: 激光焊;钛合金;T型接头;抗剪力 |
基金项目:航天二院质量与技术基础资助项目(E08D002) |
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Laser Welding for T-joints of TC4 Titanium Alloy Sheets |
Sun Yanjie Xu Yanli Li Rui
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Beijing Xinfeng Machinery Factory, Beijing 100854
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Abstract: |
Two kinds of T-joints were investigated to learn the laser welding technique with TC4 titanium alloy sheets. Effects of acid wash, welding environment and post-weld reparation to the quality of the weld bead were studied. Experimental results show that porosities are the main defect in the titanium weld joint with laser welding. Porosities are very sensitive to the humidity of the environment, while acid wash and re-welded can not reduce the number of porosities effectively. Although there are so many porosities in the weld bead, statistics of experimental results show that the shearing force of the weld joint is very high. This proved that not all porosities can reduce the area of the shearing force working on, but porosities on the surface between upside plate and underside plate of the T-joint have this effect. Thus, the intergral joint still has high shearing resistance. |
Key words: laser welding;titanium alloy;T-joint;shearing resistance |