激光功率对TiB_2增强铝基复合材料焊接接头的影响

Effect of Laser Power on Weld Formation and Microstructure of TiB_2 Enhanced Aluminum Matrix Composite

采用脉冲激光器对厚度为2 mm的Ti B2增强铝基复合材料进行了焊接性试验,分析激光功率对焊缝成形及组织的影响。结果表明:激光功率对焊缝成形的影响较大,随着激光功率的增加,脉冲激光焊接模式由热导焊接转变为深熔焊接模式,焊缝的熔深和熔宽也随着增加,焊缝成形系数由4.19减小到0.997。当激光功率增大到5.5 k W时焊接材料被激光熔透。当激光功率为6 k W时,焊缝区域平均显微硬度值达到最大,为110.4 HV,远高于母材的硬度值,主要是由于焊缝区域弥散分布的Ti B2导致。在合适的激光功率作用下,可以获得成形良好的铝基复合材料激光焊接接头。

Pulsed laser processing technology was used to weld Ti B2 enhanced Al matrix composites with 2 mm thickness. The effects of laser power on the weld formation and microstructure were investigated. The results show that the effect of laser power on the weld forming is relatively large. The penetration and width of the welded joints increase, and the pulsed laser weld model is changed from thermal condution to penetrated weld model while the laser power increases. The coefficient of weld forming changes from 4.19 to 0.997. The base metal is fully penetrated when the laser power is 5.5 k W.The hardness of the fusion zone reaches 110.4 HV, when the laser power is 6 k W. It is much higher than that of base metal,because of Ti B2 diffusion distribution in weld seam zone. The fine weld seam formation Al matrix composite welded joints can be obtained under appropriate laser power.