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镁/铝合金回填式搅拌摩擦点焊的组织与性能
徐波1, 但楚臣1, 何兆坤1, 姬书得2, 吕赞2
1.中车四方车辆有限公司, 青岛 266111;2.沈阳航空航天大学, 沈阳 110136
摘要:
选用5083铝合金和AZ31B镁合金为研究对象,研究焊接时间对异种合金回填式搅拌摩擦点焊接头的金属间化合物层和拉剪性能的影响.结果表明,当焊接时间为1 s时,Mg合金的流动性较差,接头中出现明显的孔洞缺陷;随着焊接时间的变长,孔洞缺陷消失.由于铝镁表面的氧化膜在焊接过程中被打碎且焊接温度高于铝镁的共晶温度,接头中心会形成一层液相层,焊后液相层凝固形成金属间化合物.接头的抗拉载荷随着焊接时间的延长先升高后降低,最优载荷在焊接时间为2 s时取得,为3.1 kN.
关键词:  回填式搅拌摩擦点焊  异种合金  焊接时间  抗拉载荷
DOI:10.12073/j.hjxb.2019400296
分类号:TG453
基金项目:国家自然科学基金资助项目(51705339)
Microstructure and mechanical properties of refill friction stir spot welded dissimilar Mg/Al alloys
XU Bo1, DAN Chuchen1, HE Zhaokun1, JI Shude2, LV Zan2
1.CRRC SIFANG Co.,Ltd., Qingdao 266111, China;2.Shenyang Aerospace University, Shenyang 110136, China
Abstract:
Using 5083 Al alloy and AZ31B Mg alloy as the research objects, the effect of welding time on the intermetallic compounds and lap shear properties of refill friction stir spot welded joints were mainly studied. Results showed that the Mg alloy had insufficient material flow behavior when the welding time was 1 s, thus void appeared after welding. Void disappeared with increasing the welding time. Liquid eutectic phase formed inside the joint because the oxide layers on the Al and Mg substrate surfaces were broken by the stirring of the pin and the welding temperature was higher than the eutectic temperature. Intermetallic compounds formed after the solidification of the liquid eutectic phase. The lap shear failure load firstly increased and then decreased with increasing the welding time. The maximum failure load of 3.1 kN was obtained when the welding time of 2 s was used.
Key words:  refill friction stir spot welding  dissimilar alloys  welding time  lap shear failure load