摘要搅拌摩擦焊（FSW）作为一种固相连接技术，因具有成本低、无污染，接头无气 孔、裂纹等缺陷，且焊后残余应力及变形小等诸多优点，在航空、航天、汽车、船舶 等诸多结构制造领域得到了广泛应用。研究焊后热处理对铝合金搅拌摩擦焊焊接接头 性能的影响对搅拌摩擦焊工艺参数优化具有先导性的意义。本文以 6082-T6 铝合金为 研究对象，对焊后热处理影响搅拌摩擦焊焊接接头的规律进行了探究。对经过不同时 效处理的接头进行微观组织分析、硬度测试以及拉伸性能测试，以此来评价焊后时效 对接头的影响，经过研究发现，人工时效能够使焊接接头的焊核区的强度有所提高， 而对热机影响区和热影响区的作用不大，且对接头的塑性的影响不大。T4 时效能够 大幅度提高焊接接头的塑性，但强度略低。经过 T6 时效的焊接接头强度大大提升， 但塑性有所降低。此外，经过 T6 时效处理的焊接接接头的硬度已经超过了原始母材， 这一现象对于提高焊接接头的强度有重要的意义。80928

毕业论文关键词：焊后热处理；铝合金；搅拌摩擦焊

Abstract Friction stir welding （FSW） as a solid phase connection technology, with their low cost, non-polluting, non-porous joints, cracks and other defects and weld residual stress and deformation, and many other advantages, in aviation, aerospace, automotive, shipbuilding the manufacturing and many other fields has been widely used。 After studying

the impact of friction-weld heat treatment is stirred Welding Joint Properties of Aluminum Alloy Friction Stir Welding parameters optimization of pilot significance。 In this paper, 6082-T6 aluminum alloy as the research object, stirring after welding heat treatment on the law of friction welded joints were explored。 After aging treatment for different joints microstructure analysis, hardness testing and tensile properties test, in order to assess the impact of aging on the joint after welding, after a study found that artificial aging enables the strength of the weld joint weld nugget zone has increase, while the role of the heat affected zone and heat affected zone of small and have little effect on the plastic joints。 T4 aging can significantly improve the ductility of welded joints, but the strength is slightly lower。 After aging T6 welded joint strength is greatly improved, but the ductility decreased。 In addition, the hardness after welding joints T6 aging treatment has exceeded the original base material, a phenomenon for improving the strength of the welded joint is significant

Keywords: PWHT; Friction Stir Welding; Aluminum Alloy

目 录

第一章 绪 论 1

1。1  课题研究背景及意义 1

1。2  搅拌摩擦焊技术原理 1

1。3  搅拌摩擦焊的研究现状 2

1。3。1 搅拌摩擦焊设备 2

1。3。2  搅拌摩擦焊工艺 3

1。3。3  搅拌摩擦焊接头金属塑性流动的研究 4

1。3。4  搅拌摩擦焊接头性能的研究 4

1。4  搅拌摩擦焊接头焊后热处理 6

1。5  本课题研究内容及思路 6

第二章 试验材料、设备及方案 7

2。1  试验材料 7

2。2  试验设备 7

2。2。1 搅拌摩擦焊机