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摆动焊接对异种热处理状态2219铝合金焊接接头性能的影响
蒙丹阳1, 王惠苗1, 丁吉坤1, 张登魁2,3, 刘 飞1
1.天津航天长征火箭制造有限公司;2.清华大学机械工程学院;3.天津职业技术师范大学机械工程学院
摘要:
针对2219异种热处理状态C10S+CYS铝合金进行钨极氩弧焊接试验,分别研究获取了常规焊接与摆动焊接接头的在力学性能、微观组织、硬度分布等方面的结果及差异,分析结果表明:相较常规接头,采用摆动焊接工艺的接头其力学性能有所提高,同时接头中下部PMZ、OAZ的硬度有所下降,宽度范围有所增加。应变分布结果表明断裂前常规接头最大应变沿对角线分布,而摆动接头呈近似W型分布;对微观组织及断口观察可知,摆动接头CYS侧的PMZ、OAZ中连续第二相的数量及尺寸有所降低,接头呈韧性为主的混合型断裂特征。
关键词:  2219铝合金,异种热处理状态,钨极氩弧焊,力学性能
DOI:
分类号:TG 407
基金项目:
Effect of Weaving Welding Processes on Properties of 2219 Aluminum Alloy Welded Joints with dissimilar heat treatment
MENG Danyang1, WANG Huimiao1, DING Jikun1, ZHANG Dengkui2,3, LIU Fei1
1.Tianjin Long March Launch Vehicle Manufacturing Co Ltd;2.Department of Mechanical Engineering, Tsinghua University;3.School of Mechanical Engineering, Tianjin University of Technology and Education
Abstract:
2219 aluminum alloys with dissimilar heat treatment were butt welded respectively by conventional and weaving tungsten inert gas arc welding. The characteristics of mechanical properties , microstructures and hardness distribution of the joints were studied. The analysis results showed that compared with conventional welding process joints, the weaving welding joints’ mechanical properties improved while the micro hardness values decreased in bottom region of PMZ and OAZ, and the width range increased. The joints strain distribution showed that conventional welding process joints’ max strain distribute along diagonal while the weaving joints show like nearly “W” form before fracture occurred. The microstructures observation showed that the quantity and size of the continuous second phase decreased in weaving welding joints’ CYS side PMZ and OAZ meanwhile, the fracture surface were ductile fracture mostly among the mixed fracture mode.
Key words:  2219 aluminum alloy  dissimilar heat treatment  tungsten inert gas arc welding  mechanical properties