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铝合金表面状态对搅拌摩擦焊接头组织和性能的影响 预览 被引量:3

of Surface State of Aluminum Alloy on Microstructure and Property of Friction Stir Welding Joint
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摘要 研究了铝合金表面状态对搅拌摩擦焊焊接接头组织和性能的影响。试验结果表明:试板表面油污的存在使得焊接接头强度下降为母材的60%左右,同时显著降低接头的塑性;试板表面的氧化膜和油污还会造成焊核区及焊缝前进侧的残余问混结合线缺陷。对焊接接头拉伸断口进行扫描电镜观察发现:拉伸试样的断口中存在油污和A12O3的聚集物,这些聚集物会成为拉伸时的裂纹源。断口和力学性能综合分析表明:铝合金表面的油污和氧化膜都会降低搅拌摩擦焊接头的强度和塑性。 The effects of the surface state of aluminum alloy on the microstructure and the property of the fric- tion stir-welding joint are studied. The existence of greasy dirt on the base material surface may cause the descending of the joint property to 60% of the base material, and has obvious influence on the plastic property of the joint. In addition,the oxide layer and greasy dirt on the base material surface may cause JLR flaw in the stir zone and the weld advanced side. The SEM microstructure features are observed in weld tensile fractures. Results show that in the fractures of tensile samples,the greasy dirt and A1203 polymer become the crack source in the tensile test. The comprehensive analysis of fractures and properties shows that both greasy dirt and oxide layer on the surface of aluminum alloy can reduce the intensity and the plastic property of the friction stir welding joint.
作者 赵勇 付娟 严铿 蒋成禹 陈华斌 ZHAO Yong, FU Juan, YAN Keng, JIANG Chengyu, CHEN Huabin(1. Provincial Key Lab of Advanced Welding Technology, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003, China; 2. School of Materials Science and Eng. ,Shanghai Jiao Tong University, Shanghai 200030, China)
出处 《江苏科技大学学报:自然科学版》 CAS 北大核心 2008年第1期 39-42,共4页 Journal of Jiangsu University of Science and Technology:Natural Science Edition
关键词 铝合金 表面状态 搅拌摩擦焊 组织 性能 aluminum alloy surface state friction stir welding microstructure property
作者简介 赵勇(1978-),男,辽宁葫芦岛人,讲师,研究方向为有色金属焊接和搅拌摩擦焊。
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参考文献5

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二级参考文献7

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