Fibre laser welding of dissimilar alloys of Ti-6Al-4V and Inconel 718 for aerospace applications
Fibre laser welding of dissimilar alloys of Ti-6Al-4V and Inconel 718 for aerospace applications
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DOI：
10.1007/s00170-010-2791-3
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发表时间：
2011-02
期刊：
影响因子：
--
通讯作者：
Hui Chen;A. Pinkerton;Lin Li
中科院分区：
文献类型：
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作者：
Hui Chen;A. Pinkerton;Lin Li
异种材料焊接面临的挑战是焊接材料之间的物理和化学性能的差异以及金属间脆性相的形成导致焊缝机械性能的劣化。然而，工业上对异种材料焊接的需求越来越大，因为它可以有效地降低材料成本并改进设计。在航空航天领域，Ti-6Al-4V钛合金和Inconel 718镍合金因其上级的耐蚀性和力学性能而得到广泛应用。在这项研究中，单模连续波光纤激光器用于对接焊接Ti-6Al-4V的Inconel 718。通过改变工艺参数，如激光功率、焊接速度和激光束偏离金属界面的位置，进行了包括冶金和机械检查在内的研究。进行了简单的分析模型分析，以解释在这一过程中发生的现象。结果表明，在较高的激光功率、较高的焊接速度和激光束从界面侧向Inconel 718合金侧偏移的焊接条件下，可以有效地抑制金属间化合物脆性相和焊接缺陷的形成。提出了改善Ti-6Al-4V/Inconel 718焊接质量的激光线能量和激光束位置。
Challenges in dissimilar materials welding are the differences of physical and chemical properties between welding materials and the formation of intermetallic brittle phases resulting in the degradation of mechanical properties of welds. However, dissimilar materials welding is increasingly demanded from the industry as it can effectively reduce material costs and improve the design. In aerospace applications, Ti-6Al-4V titanium alloy and Inconel 718 nickel alloy have been widely used because of their superior corrosion resistance and mechanical properties. In this study, a single-mode continuous-wave fibre laser was used in butt welding of Ti-6Al-4V to Inconel 718. Investigations including metallurgical and mechanical examinations were carried out by means of varying processing parameters, such as laser power, welding speed and the laser beam offset position from the interface of the metals. Simple analytical modelling analysis was undertaken to explain the phenomena that occurred in this process. Results showed that the formation of intermetallic brittle phases and welding defects could be effectively restricted at welding conditions produced by the combination of higher laser power, higher welding speed and shifting the laser beam from the interface to the Inconel 718 alloy side. The amount of heat input and position of laser beam to improve the Ti-6Al-4V/Inconel 718 weld quality are suggested.