TA4/Q235层状复合材料激光穿透焊研究  

Study on Laser Penetration Welding of TA4/Q235 Layered Composite

作　　者：王志英 李佳旗 张建勋[1] 李振岗[1] WANG Zhiying;LI Jiaqi;ZHANG Jianxun;LI Zhengang(Xi'an Jiaotong University,State Key Laboratory of Mechanical Behavior for Materials,Xi'an 710049,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《焊管》2024年第2期29-36,共8页Welded Pipe and Tube

基　　金：国家自然科学基金项目“双金属层状复合材料共熔池激光穿透焊物理机制及‘三明治夹层’接头组织性能调控研究”(项目编号51875442)。

摘　　要：为解决钛/钢层状金属在熔焊过程中易产生脆性金属间化合物而导致接头出现裂纹、难以实现可靠连接的难题,对TA4和Q235层状复合材料的激光穿透焊接进行工艺探索,并添加T2紫铜作为中间层进行工艺优化。结果显示,在合适的工艺参数下,TA4/Q235激光穿透焊接接头呈酒杯状,焊缝上下部分出现明显的元素交换,引发裂纹缺陷;引入Cu作为中间层后,得到的Ti-Cu-Fe焊接接头成形良好。能谱分析结果表明,添加Cu可有效阻隔Ti、Fe的直接接触,避免了脆性金属间化合物的产生,焊缝晶粒在一定程度上得以细化且开裂现象明显减少,从而改善了TA4/Q235的焊接性;激光穿透焊接的最佳参数为激光功率3 000 W,线速度2.0 m/min。研究结果对Ti/Fe复合板在航空航天、石油化工等领域的应用有积极的探索作用,具有重要的工程应用前景。In order to solve the problem that it's difficult to achieve reliable connection of titanium/steel layered metal in fusion welding process,because brittle IMCs are easy to produce and cause cracks in the joint.The laser penetration welding process of TA4 titanium and Q235 steel layered composite was explored,and the process was optimized by adding intermediate layer T2 Cu.The results show that under appropriate process parameters,the joints of TA4/Q235 laser penetration weld are wineglass shaped.Significant elemental exchange occurs in the upper and lower parts of the weld,initiating cracking defects.The Ti-Cu-Fe welded joints obtained after introducing Cu as an intermediate layer were well formed.The energy spectrum analysis shows that the addition of Cu effectively blocks the direct contact of Ti and Fe and avoids the generation of brittle IMCs.The weld grain is refined to a certain extent and the cracking phenomenon is significantly reduced,improving the weldability of TA4/Q235.The optimal parameters for the experimental conditions were laser power 3000 W and line speed 2.0 m/min.The results have a positive exploratory effect on the application of Ti/Fe composite plates in aerospace,petrochemical and other fields,and have important engineering application prospects.

关 键 词：层状复合材料 激光穿透焊 TA4/Q235 Cu中间层 工艺优化 

分 类 号：TG456.7[金属学及工艺—焊接]