激光深熔焊条件下添加Ti粉双相钢/铝合金接头组织和性能  

Microstructure and Mechanical Properties of Adding Ti Powder Weld Joint in Dual-Phase Steel to Aluminum Alloy Under Process Condition of Laser Deep Fusion Welding

作　　者：徐少华[1] 周惦武[1] 刘金水[1] Xu Shaohua;Zhou Dianwu;Liu Jinshui(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《激光与光电子学进展》2022年第3期186-193,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51674112)。

摘　　要：以DP590双相钢、6016铝合金为研究材料,通过“钢在上部、铝在下部”的搭接模式,进行了激光深熔焊接试验,比较了两者之间添加Ti粉前后接头组织以及性能的改变。结果显示,在气流为15 L/min的Ar气保护氛围下,当离焦量为+1.0 mm,1600 W的激光束以35 mm/s的速度焊接时,添加Ti粉得到的焊缝成形质量较优,线载荷的平均值为110 N/mm,并且相比于未加粉末情况下增大了10%;加入Ti粉可以细化晶粒,同时在焊接过程中,Ti元素大部分会扩散到液态铝附近,并与Fe发生反应得到延性相Fe2Ti,进而提高接头性能。DP590 dual-phase steel and 6016 aluminum alloy were used as test materials.A laser deep fusion welding test was conducted using Ti powder in the lap mode of“steel at the top and aluminum at the bottom,”and the microstructure and properties of the joint before and after adding the Ti powder between them were compared.The test results show that under a laser power of 1600 W,a welding speed of 35 mm/s,a defocus amount of+1.0 mm,and back protection using the Ar protective gas of 15 L/min,the welding quality is improved by the addition of the Ti powder,and the average line load is 110 N/mm,which is 10%higher than the condition without the addition of the powder.The addition of the Ti powder can refine the grain size.During the welding process,the Ti powder will be absorbed into the liquid aluminum and react with Fe to form a ductile phase Fe2 Ti,which will improve the property of weld-joint.

关 键 词：材料 激光熔焊 钢/铝 添加Ti粉 冶金反应 

分 类 号：TG442[金属学及工艺—焊接]