| 摘要: |
| 针对航空航天领域“钛火”防护问题开展了激光焊接Ti40阻燃钛合金工艺研究，试验获得了Ti40合金焊接的最佳工艺参数，并分析了此参数下激光焊接接头的显微组织。研究结果表明：最佳的激光焊接工艺参数为：功率P=1800W，速度V=1.1m/min，离焦量Δf=+1mm，氩气流量为10L/min。当焊接功率低于1.8kW时，容易出现未焊透的情况，而在相同的焊接功率下，焊接速度越慢，焊接质量越差。激光焊接Ti40阻燃合金接头的微观组织主要为β柱状晶，从融合线位置开始生长，整体朝向焊缝中心的顶部聚拢；其顶部的组织为β柱状晶，底部的组织则是β柱状晶和等轴晶，底部的晶粒尺寸普遍小于顶部。 |
| 关键词: 激光焊接 Ti40 显微组织 |
| 基金项目:江西省自然科学基金（20181BAB206027），无损检测技术教育部重点实验室开放基金（EW201901084）。 |
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| Research on Laser Welding Technology of Ti40 Burn-resistant Titanium Alloy |
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Liang Renyu1, Su Qian1, Liu Fenggang1, Chen Jiming2, Huang Chunping1
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1. Key Laboratory of Nondestructive Testing?(Minisity of Education), Nanchang Hangkong University, Nanchang 330063;2. Shandong Kai Ze Hen Xin Machinery Co., Ltd., Jinan 250000
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| Abstract: |
| In view of the problem of titanium fire prevention in the aerospace field, laser welding Ti40 burn-resistant titanium alloy technology research has been carried out. In the experiment, the optimal process parameters of Ti40 alloy welding are obtained, and the microstructure of the laser welding joint is analyzed. The research results show that the optimal laser welding process parameters are: power P=1800W, speed V=1.1m/min, defocus amount Δf=+1mm, and argon flow rate 10L/min. Incomplete penetration occurs when the welding power is lower than 1.8kW, and at the same power, the slower the welding speed, the worse the welding quality. The microstructure of laser-welded Ti40 burn-resistant alloy joints is mainly β columnar crystals, which grow from the position of the fusion line and converge towards the top of the weld center. The microstructure at the top is β columnar crystals, and the structure at the bottom is β columnar crystals and equiaxed crystals. The grain size at the bottom is generally smaller than the top. |
| Key words: laser welding Ti40 microstructure |
