中国激光, 2015, 42 (5): 0503003, 网络出版: 2015-04-20  

基于强脉冲激光的Ti/Al冲击点焊实验研究

Experimental Study of Ti/Al Impact Spot Welding by Intense Laser Pulse Induced Shock Waves
作者单位
江苏大学机械工程学院, 江苏 镇江 212013
摘要
提出了一种可以实现同种或异种金属材料固态冶金结合的新型激光冲击点焊工艺。实验中,采用Nd∶YAG激光器发出的脉冲激光驱动厚度为30 μm 的钛箔产生局部塑性变形,并以超高速撞击厚度为100 μm 的铝板以实现点焊连接。当钛箔的飞行距离分别为0.3、0.6、0.9 mm 时,焊点中心的回弹区域面积依次减小,而结合区域面积依次增大。采用冷镶嵌技术制样用来观察焊点的截面特征,发现了沿焊点直径方向振幅和周期变化的波形界面和平直型界面。为研究激光冲击点焊对材料力学性能的影响,应用纳米压痕测试技术测量了垂直于焊接界面方向材料的显微硬度,结果表明焊接界面附近材料的硬度值明显提高。此外,焊接试样的拉伸剪切测试结果表明,当复板和基板发生有效固态冶金结合时其连接强度较高,失效形式通常是焊点边缘破裂。激光冲击点焊为厚度在微米级的异种金属箔板的点焊连结开辟了新途径。
Abstract
A novel laser impact spot welding process is proposed, during which solid state and metallurgical bonding of similar or dissimilar metal combinations can be obtained. In the experiment, the laser pulse is launched from a Nd∶YAG laser to induce the Ti foil in the thickness of 30 μm to bulge and collide to the 100 μm thickness Al plate with high speed to get spot joint. When the standoff distances of the Ti foil are 0.3、0.6、0.9 mm, respectively, the springback area at the center of the weld spot decreases, and the bonding area increases gradually. The cold inlaid technique is used to fix the weld examples for studying the cross-sections features of the weld spot, and wavy interface with the alterative amplitude and period along the diameter direction of the weld spot and the straight weld interface are observed. In order to investigate the influence of laser impact spot welding on the mechanical properties of the materials in the weld zone, the nanoindentation hardness test is applied across the weld interface. It is found that the microhardness in the weld interface region increases obviously. Moreover, the results lap shear strength test show the bonding strength of weld spot is relatively fine when effective solid-state and metallurgical bond is obtained during welding, and the failure usually occurs at the edge of the weld spots. Laser impact spot welding provides a new way for dissimilar metal foils welding in the thickness of micro level.

顾宇轩, 王霄, 沈宗宝, 邱唐标, 马友娟, 张迪, 刘会霞. 基于强脉冲激光的Ti/Al冲击点焊实验研究[J]. 中国激光, 2015, 42(5): 0503003. Gu Yuxuan, Wang Xiao, Shen Zongbao, Qiu Tangbiao, Ma Youjuan, Zhang Di, Liu Huixia. Experimental Study of Ti/Al Impact Spot Welding by Intense Laser Pulse Induced Shock Waves[J]. Chinese Journal of Lasers, 2015, 42(5): 0503003.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!