中国激光, 2011, 38 (6): 0603004, 网络出版: 2011-05-26
激光焊接熔池流动性试验研究
Experimental Research on Fluidity of Laser Welded Molten Pool
激光技术 激光焊接 熔池 粒子分布 硬度 流动性 laser technique laser welding molten pool particle distribution hardness fluidity
摘要
采用大功率CO2激光器研究Al-ZL101/TiB2-Al三层板激光焊接,根据扫描电镜(SEM)及维氏硬度计观察并测量焊后各层TiB2分布及焊缝硬度,得出了在激光焊透及未焊透时的熔池流动状态。结果表明,在激光未穿透焊接时,熔池内存在一个对流环,其对流在小孔缩颈处最为强烈,此处硬度值最大,TiB2体积分数最高,而在熔池底部对流最弱,硬度值最低,TiB2体积分数最小;在激光全焊透焊接时,熔池在上下两个表面分别存在对流环,下表面对流比上表面对流更为强烈,其硬度值较大,TiB2体积分数较高,对流在焊缝中间层两对流环连接处最弱,此处对流流失的TiB2最少,使得TiB2体积分数最大,硬度值最高。
Abstract
The fluidity of molten pool is analyzed with CO2 laser welding on Al-ZL101/TiB2-Al triple plates. Scan electron microscope (SEM) and hardness tester are used to observe the TiB2 distribution and measure the hardness. The fluidity of molten pool is inferred according to the TiB2 distribution and hardness values of weld seam. In the incomplete penetration, a convection loop is presented and the strongest convection locates at the neck of keyhole where the highest hardness and TiB2 volume fraction are presented. In the full penetration, two convection loops are presented on the top and bottom surfaces of molten pool, respectively. The convection is stronger at the bottom than that on the top so that it has higher TiB2 volume fraction and hardness. The slightest convection occurs in the link of two loops, i.e. the center of weld seam where the highest hardness and TiB2 volume fraction are presented because of the smallest reduction of TiB2 flowing away with the convection.
崔海超, 芦凤桂, 唐新华, 姚舜. 激光焊接熔池流动性试验研究[J]. 中国激光, 2011, 38(6): 0603004. Cui Haichao, Lu Fenggui, Tang Xinhua, Yao Shun. Experimental Research on Fluidity of Laser Welded Molten Pool[J]. Chinese Journal of Lasers, 2011, 38(6): 0603004.