FeSiB非晶薄带激光焊焊缝成形及接头力学性能  

Forming and Mechanical Properties of FeSiB Amorphous Ribbon Joint by Laser Welding

作　　者：龚玉兵[1] 王善林[1] 陈玉华[1] 柯黎明[1] 

机构地区：[1]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,江西南昌330063

出　　处：《中国激光》2016年第3期30-36,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(51461031);国家重点实验室开放基金(2013-Z05);江西省教育厅科技落地计划(KJLD14055)

摘　　要：采用微脉冲激光技术实现了厚度约为25 μm FeSiB 非晶薄带的搭接，研究了脉冲功率P、脉冲宽度T、脉冲频率F 等主要工艺参数对焊缝成形的影响，分析了接头力学性能的变化规律。研究结果表明，当P 与T 搭配恰当时（P为4.8～7.2 W、T 为1.5～1.9 ms、对应脉冲能量E 为0.9～1.2 J）才可以获得焊缝成形良好、力学性能优异的焊接接头。随着T 的增加，热影响区和焊缝区显微硬度逐渐降低，而随着P 的增加，显微硬度先增大后减小；接头抗拉强度随着T 和P 的增大呈先增大后减小的趋势变化。当P=7.2 W、T=1.7 ms、F=1.5 Hz时，热影响区和焊缝区平均硬度值最高，约为1300 Hv和1000 Hv，抗拉强度可达363 MPa。Overlap joint of the FeSiB amorphous ribbon with thickness about 25 μm is successfully fabricated by micro pulsed laser. Effect of main process parameters including pulse power P, pulse width T, pulse frequency F on the weld forming is studied, and then the variation trend of mechanical properties is analyzed. The results indicate that the perfect weld forming and excellent mechanical properties can be obtained when P and T are matched appropriately, i.e. P is 4.8~7.2 W, T is 1.5~1.9 ms, and corresponding energy E is 0.9~1.2 J. With the increase of T, the microhardness of heat affected zone and weld zone decreases gradually. However, with the increase of P, the microhardness increases first and then decreases. With the increase of P and T, tensile strength of joint increases first and then decreases. The highest average microhardness of about 1300 Hv and 1000 Hv in the heat affected zone and weld zone is obtained, respectively, and the tensile strength exceeds 363 MPa, when P is 7.2 W, T is 1.7 ms, and F is 1.5 Hz.

关 键 词：激光技术 FeSiB非晶薄带 焊缝成形 力学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]