为了改善SiCp/6061Al的焊接性能,在其焊接过程中引入了电弧超声技术.应用自主研制的交流电弧超声等离子焊接设备,以自制的Al-15Ti-3Si药芯焊丝为填充材料,在不同频率的电弧超声作用下对SiCp/6061Al进行了等离子弧原位焊接,研究了电弧超声对焊接接头的作用机理.实验结果表明：电弧超声可使新生Al3Ti相明显细化;在频率30、50和60 kHz下,Al3Ti被击碎为颗粒状或块状,并均匀分布在焊缝中;在频率20、40和70 kHz下,Al3Ti被部分击碎,且沿原有位置呈纵向分布在焊缝中.分析表明,电弧超声主要通过空化效应和声流效应的综合作用对Al3Ti相的形态及分布产生影响,同时这种综合作用受到电弧超声＂谐振波群＂现象的影响.
To improve the welding performance of SiCp/6061Al,arc-ultrasonic technology was applied in welding process,and the filling material was Al-15Ti-3Si.The mechanism of arc-ultrasonic on microstructures of joint of SiCp/6061Al MMCs in plasma arc ＂In-situ＂ welding with different arc-ultrasonic frequency was investigated.The result shows that the Al3Ti phase is obviously refined by ultrasound.With the frequency 30,50 and 60 kHz,the Al3Ti is crushed to granular or block,and uniformly distributed in the weld.With the frequency 20,40,70 kHz,the Al3Ti is partially crushed,and distributed at the original location along the vertical in the weld.Analysis shows that the arc-ultrasonic impacts the morphology and distribution of Al3Ti mainly by cavitation and acoustic streaming.
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