为了改善MGH956合金的熔化焊接头性能,在其焊接过程中引入了电弧超声技术,以自制高Ni固体焊丝为填充材料对MGH956合金进行焊接,并与常规TIG焊进行对比,研究了电弧超声对焊缝组织和性能的影响.结果表明:电弧超声使焊缝组织得到明显细化,气孔数量减少;纳米Y2O3颗粒的聚集现象得到一定控制,且分布更加均匀;颗粒与基体Fe润湿性得以改善,使得两者界面结合良好,接头抗拉强度得到提高,达到615 MPa,同时焊缝的塑性得到明显提高,且使焊接接头由脆性断裂转变为完全韧性断裂.
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