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摘要试验研究了板厚为4mm的T2紫铜板的钨极电弧复合热源搅拌摩擦焊和搅拌摩擦焊工艺，分析了接头组织及性能。结果表明，钨极电弧复合热源搅拌摩擦焊可形成外观良好的焊缝，但由于焊接参数不当，易在前进侧形成孔洞缺陷，焊缝组织为典型的再结晶组织；搅拌摩擦焊焊后的接头强度可达到母材的62.5%，焊缝组织为再结晶组织，晶粒细小。以钨极电弧作为复合热源的搅拌摩擦焊由于铜材基体温度较高，搅拌头的磨损较少。搅拌摩擦焊时，搅拌头磨损较严重，致使搅拌头中的元素进入焊缝。7273
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关键词：T2紫铜；搅拌摩擦焊；复合热源；组织性能分析
毕业设计说明书（论文）外文摘要
Title Investigation of Compound Heat Source Friction Stir Welding with Pure Copper
Abstract
This study aimed to experimentally explore the microstructure and properties of joints undergoing tungsten arc-enhanced friction stir welding and double-sided friction stir welding with 4mm thick pure copper T2 plates. The results show that samples welded under tungsten arc-enhanced friction stir welding process has a good appearance. However, the improper welding parameters would easily cause pore defects on the advancing side. These samples also exhibits a typical recrystallized structure. On the other hand, the average tensile strength of samples welded under double-sided FSW process is 62.5% of base metal. A significant transition zone of the upper and lower weld nugget formed in the middle of the two nuggets. The microstructure of these joints is recrystallized structure with fine grains. Due to the tool’s extrusion and mixing, joints have twin structure and lower hardness than base metal. Because of the higher temperature, the tool is not badly wear and tear during tungsten arc-enhanced friction stir welding process. In contrast, in the process of double-sided friction stir welding, the tool is seriously abraded, and caused the elements mixed into the joint.
Keywords pure copper T2; friction stir welding; compound heat source; analysis of microstructure and property
目录
1 绪论 1
1.1 前言 1
1.2 铜及铜合金的焊接 1
1.2.1 铜及铜合金的分类 2
1.2.2 铜及铜合金的焊接性 2
1.3 搅拌摩擦焊简介 3
1.3.1 搅拌摩擦焊的优点 3
1.3.2 搅拌摩擦焊的缺点 3
1.3.3 搅拌摩擦焊参数选择 4
1.4 研究现状 4
1.4.1 铜及铜合金搅拌摩擦焊研究现状 4
1.4.2 复合热源研究现状 5
1.5 本试验研究意义及主要内容 5
2 试验材料、设备及方法简介 7
2.1 试验材料 7
2.2 试验设备 7
2.2.1 焊接设备 7
2.2.2 试验测试与分析设备 8
2.3 试验方法 10
2.3.1 铜的钨极氩弧复合热源搅拌摩擦焊接试验 10
2.3.2 金相分析试验 10
2.3.3 显微硬度试验 11
2.3.4 拉伸试验 11