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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。
The pulsed laser was used to test the weldability of TiB2 reinforced aluminum matrix composite with a thickness of 2 mm. The influence of laser power on the forming and microstructure of the weld was analyzed. The results show that the laser power has a great influence on the forming of the weld. With the increase of the laser power, the pulse laser welding mode changes from the thermal conduction welding to the deep penetration welding mode. The penetration and melting width of the welding seam also increase. Coefficient of forming decreased from 4.19 to 0.997. The welding material is laser-pooled as the laser power increases to 5.5 kW. When the laser power is 6 kW, the average microhardness of the weld zone reaches the maximum value of 110.4 HV, which is much higher than that of the base metal, mainly due to the diffusive distribution of TiB2 in the weld zone. Under the proper laser power, well-formed aluminum matrix laser welded joints can be obtained.