2060铝锂合金扫描填丝焊接工艺

针对铝锂合金焊后易产生气孔、抗拉强度低的缺点，提出“∞”形激光扫描填丝焊接工艺方法，以2 mm厚2060铝锂合金为研究对象开展对接焊接试验研究，探究激光扫描填丝焊接方法对铝锂合金焊接缺陷抑制作用. 借助高速相机摄像系统，探究了激光扫描填丝焊接工艺下熔池的动态演变过程，同时探究了扫描参数对焊缝气孔的影响规律及扫描填丝工艺对气孔的抑制机理. 采用曲面响应统计方法探究工艺参数对抗拉强度的影响，并给出工艺参数组合与抗拉强度的定量关系及最优参数组合，焊接接头最大抗拉强度可达382 MPa，为母材的76.4%. 结果表明，“∞”形激光扫描填丝焊接工艺下熔池流动平稳，小孔喷发强度较弱且呈现出周期性；“∞”形激光扫描填丝焊接工艺可以有效抑制焊缝气孔，提高铝锂合金焊接质量.

Laser scanning welding of 2060 Al-Li alloy with filler wire

In order to solve the problems of porosity and insufficient tensile strength of aluminum lithium alloy weld, a method of laser scanning welding with filler wire was proposed. Taking 2060 Al-Li alloy with 2 mm thickness as research objects, the suppression effect of laser scanning welding with filler wire on welding defects of Al-Li alloy was investigated. A high-speed camera system was built to explore the mechanism and the change of the dynamic evolution of the molten pool. The influence of scanning parameters on the formation of porosity in weld seam and the mechanism of inhibiting porosity of laser scanning welding with filler wire technique were investigated. Response surface methodology was applied to explore the influence of process parameters on tensile strength. The quantitative relationship between process parameter combination, tensile strength and the optimal parameter combination were proposed. The maximum tensile strength of the weld is 382 MPa, which is 76.4% of the base metal. The research shows that the flow of the molten pool is stable, and meanwhile the eruption of the keyhole is weak and showing the periodicity, in the process of “∞” shaped laser scanning welding with filler wire. And the process of “∞” shaped laser scanning welding with filler wire can effectively inhibit weld porosity and improve the welding quality of Al-Li alloy.