6061-T4铝合金回填式搅拌摩擦点焊显微组织及力学性能研究.doc

文档介绍：
6061-T4 铝合金回填式搅拌摩擦点焊显微组
织及力学性能研究#
申志康1,杨新岐1,张照华1,尹玉环2**
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(1. 天津大学天津市现代连接技术重点实验室,天津 300072;
2. 上海航天设备制造总厂,上海 200245)
摘要:对 6061-T4 、显微硬
度、剪切拉伸和十字形拉伸测试。试验结果表明:接头显微组织可以分为焊核区、热机影响
区、热影响区及母材;在焊缝中发现了钩状缺陷、孔洞、未熔合、未完全回填及粘连韧带等
缺陷;焊缝区显微硬度呈 W 型分布,搅拌区内的显微硬度呈 V 型分布;最大剪切载荷可达
,接头的十字形拉伸载荷与工艺随工艺参数的变化规律比较复杂,最大十字形拉伸
载荷可达 。在剪切力的作用下,点焊接头有三种断裂模式,即塞型断裂、剪切断
裂及塞型-剪切断裂;在十字拉伸载荷下,点焊接头同样有三种断裂模式,即即塞型断裂(断
在上板)、焊核剥离、塞型断裂(断在下板)。
关键词:铝合金;回填式搅拌摩擦点焊;显微组织;力学性能
中图分类号:G404;+1
Study of microstructure and mechanical properties of
friction spot welded 6061-T4 aluminum alloy joints
SHEN Zhikang1, YANG Xinqi1, ZHANG Zhaohua1, YIN Yuhuan2
(1. Tianjin Key Laboratory of Advanced Joining Technology,School of Material Science and
Engineering. Tianjin University, TianJin 300072;
2. Shanghai Spaceflight Manufacture (Group) Co., Ltd, ShangHai 200245)
Abstract: 6061-T4 aluminum alloy was essfully spot jointed by friction spot welding. The
joint were tested by microstructure, microhardness, tensile/shear strength and cross-tension
strength. Experimental results indicate that the microstructure can be divided in nugget zone,
thermo-mechanically affected zone, thermo-mechanically affected zone and the base material,
respectively. Defects such as hook, cavity, plete fusion, plete refill and bonding
ligament were found in the joi