2060铝锂合金填充ER2319焊丝激光焊焊接性研究

发布时间：2018-02-22 07:14

本文关键词： 铝锂合金激光焊接显微组织力学性能　出处：《应用激光》2016年06期 　论文类型：期刊论文

【摘要】：2060铝锂合金是新一代铝锂合金中具有更低密度及更高强度的典型代表。利用高功率光纤激光填充ER2319焊丝对2060铝锂合金进行了对接试验,借助光学显微镜、扫描电镜、显微硬度测试、拉伸性能测试等手段研究了焊缝形貌和组织特征及焊缝的力学性能等。研究结果表明,焊接稳定性在一定程度上影响焊缝的宏观成形,在合理的焊接工艺下,焊接功率P=3kW与填丝速度w=3m/min保持不变,随着焊接速度的增加,焊缝整体的晶粒尺寸呈现变小的趋势,枝晶臂由繁多变得简单,等轴枝晶的二次枝晶逐渐减少甚至消失;焊缝的平均硬度达到95.7HV,抗拉强度达到了345MPa,分别为母材2060合金的63.0%和65.1%;焊缝的熔合线附近区域是接头的最薄弱环节,拉伸断裂沿熔合线从焊缝的下部向上扩展,断口表现为沿晶界的韧脆混合断裂,焊缝下部的韧性优于焊缝的上部。
[Abstract]:2060 Al-Li alloy is a typical representative of the new generation Al-Li alloy with lower density and higher strength. The docking test of 2060 Al-Li alloy was carried out by using high-power fiber laser filled ER2319 wire. The morphology and microstructure of the weld and the mechanical properties of the weld are studied by means of microhardness test and tensile test. The results show that the welding stability affects the macroscopic forming of the weld to some extent, and under the reasonable welding process, With the increase of welding speed, the grain size of the weld becomes smaller, the dendrite arm becomes simple, and the secondary dendrite of equiaxed dendrite decreases or even disappears. The average hardness and tensile strength of the weld are 95.7HVand 345MPa, respectively, which are 63.0% and 65.1 of the base alloy 2060. The area near the fusion line of the weld is the weakest link of the joint, and the tensile fracture extends from the lower part of the weld line to the top of the weld. The fracture surface is a ductile and brittle mixed fracture along grain boundary, and the toughness of the lower part of the weld is better than that of the upper part of the weld.
【作者单位】：南昌航空大学轻合金加工科学与技术国防重点学科实验室;三江航天红阳机电有限公司;
【基金】：国家自然科学基金资助项目(项目编号:51565041;51565040) 江西省教育厅科研资助项目(项目编号:GJJ150710)
【分类号】：TG456.7

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