钛合金发动机壳体等离子焊接工艺研究
关键词 TC4钛合金 等离子弧焊接 微观组织 显微硬度10188
毕业设计说明书（论文）外文摘要
Title study on plasma welding to titanium alloy engine case
Abstract
This paper adopts the keyhole plasma arc welding process on the plate thickness of 3mm TC4titanium alloy sheet for welding. Analysis of the different parameters of welded joint forming and characteristics of the organization, and determination of micro Vickers hardness of welded joint. The results show that: when the heat input is larger, plasma gas flow is smaller, plasma arc welding seam forming effect is better. Heat input size has a great impact on the structure of welded joint. heat input, welded joints weld columnar grain growth significantly, coarse grained zone of coarse grains, grain boundaries obviously, fine grain zone is narrowed, fine grained zone and base material boundaries more clearly. Heat input size on the welding joint have great influence on the organization. When the heat input welded joint weld zone, columnar grain growth significantly, coarse grained zone of coarse grains, grain boundaries obviously, fine grain zone is narrowed, fine grained zone and base material boundaries more clearly. Welded joint of coarse grain zone the hardness decreased, the weld zone average hardness and parent material and consistent. With the selected welding parameters for titanium alloy sheet for docking, can get good weld forming.
Keywords TC4 titanium alloy plasma welding microstructure
microhardness目 次
1 引言 1
1．1 课题的意义 1
1．2 钛合金的性能及其应用 1
1．3 钛合金焊接的主要问题 3
1．4 钛合金常见焊接方法 4
1．5 钛合金采用等离子弧焊接的优点 6
1．6 论文研究的内容 7
2 试验材料及试验方法 8
2．1 试验材料 8
2．2 试验设备 8
2．3 实验方案设计 10
3 小孔型等离子焊焊缝成形及微观组织分析 11
3．1 焊缝成形分析 11
3．2 接头宏观金相分析 13
3．3 接头微观金相分析 14
3．4 本章小结 18
4 小孔型等离子焊焊接接头力学性能分析 19
4．1 接头硬度分析 19
4．2 本章小结 20
5 等离子对接焊接试验 21
结论 24
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