论文部分内容阅读
采用激光焊接方法对AZ31镁合金薄板进行焊接,借助金相显微镜、布氏硬度计、拉伸试验机等手段研究超声波功率对焊接接头组织与性能的影响。同时利用图像分析软件Image-Pro Plus测量焊缝平均晶粒尺寸。结果表明,超声波功率对接头组织与性能影响明显。随着超声波功率的增加,空化效应以及声流作用越来越明显,平均晶粒尺寸由54μm减小到24μm,接头宏观硬度与抗拉强度均呈先增加后减小的变化。其中当超声波功率增加至1 200W时,平均晶粒尺寸最小,其最小值仅为24μm,而宏观硬度(HB)与抗拉强度均达到最大值,分别为56和286.54 MPa。
The laser welding method was used to weld the AZ31 magnesium alloy sheet. The influence of ultrasonic power on the microstructure and properties of the welded joint was studied by metallographic microscope, Brinell hardness tester and tensile tester. At the same time using the image analysis software Image-Pro Plus to measure the average weld grain size. The results show that ultrasonic power has obvious influence on the microstructure and properties of joints. With the increase of ultrasonic power, the effect of cavitation and acoustic flow become more and more obvious. The average grain size decreases from 54μm to 24μm, and the macroscopic hardness and tensile strength of the joint increase first and then decrease. When the ultrasonic power was increased to 1 200 W, the average grain size was the smallest, the minimum was only 24 μm, while the maximum hardness (HB) and tensile strength reached 56 and 286.54 MPa, respectively.