【摘要】 通过外加激励源方式对等离子电弧进行高频调制从而激发出电弧超声,以Ti丝作为填充材料,以氮氩混合气体作为离子气,在不同激励频率下对SiCp/6061Al复合材料进行电弧超声等离子弧原位合金化焊接。结果表明:在施加电弧超声后,焊缝组织中TiC、TiN等新生颗粒明显得到细化,分布较为均匀;粗大Al3Ti相得到细化且数量减少;在50kHz时焊缝组织最优。拉伸试验结果表明:在施加50kHz超声时拉伸强度最大为225MPa,比未施加超声时的203MPa增加了7%左右。更多还原

【Abstract】 The effect of arc-ultrasound on microstructures and mechanical properties of SiCp/6061Al MMCs joints produced by arc-ultrasound plasma arc "in-situ" alloy-welding with different excitation frequencies was investigated, in which argon-nitrogen mixture was used as plasma gas, Ti wire as filler and the arc-ultrasound was produced by modulating the plasma arc with high frequency. The results show that arc-ultrasound could refine the new reinforced composites such as TiC, TiN significantly, and improve their distribution greatly. And new phase Al3Ti becomes finer and less. The test results of mechanical properties indicate that the maximum tensile strength of welded joints is gained when the excitation frequency is 50 kHz, and the maximum is 225 MPa, raising by about 7% compared with conventional plasma arc welding (PAW) (203 MPa).更多还原