摘要：本文基于机器人TIG电弧增材制造技术，采用了异种铝合金的双填丝送丝工艺方法，将焊丝的送丝速度比也就是送丝量比作为变量，其余的可变参数作为定量，对铝镁合金和铝硅合金的堆覆直壁体进行宏观尺寸精度以及力学性能及其组织等进行分析研究。

经过焊接试验过程以及结果得出，直壁体的层高与送丝速度比无关，每一层层高基本为2mm。随着异种铝合金送丝速度比从5:5到9:1，直壁体会从“混层”形貌变化到表面产生“凸起”。通过直壁体横截面的金相以及晶粒组织观察分析看出，铝机体在组织内部没有被破坏，并且还存在许多游离的共晶组织。拉伸试验表明送丝速度比为9:1的直壁体的拉伸件抗拉强度最大，为233.3MPa。④号和⑤号强度最为接近，力学性能也较为接近，抗拉强度为161MPa。且直壁体的断口均为韧性断裂。通过SEM可以发现。经过EDS的X射线能谱分析表明基本所有的合金元素在焊接过程中分布均匀。

关键词 增材制造 TIG 异种金属 双填丝 宏观尺寸 力学性能

毕业设计说明书外文摘要

Title Experimental Study on Manufacturing Technology of TIG  Arc Reinforcement for Dissimilar Aluminum Alloy

Abstract：This paper, based on the robot TIG arc generator technology, uses the different kinds of aluminum alloy double wire feeding process as ways. It takes the wire feed speed ratio as well as the amount of wire as a variable and the remaining variable parameters as a quantitative. It analyses Magnesium alloy and AI-Si alloy, and the mechanical properties and micromechanism.

It gets the results through the welding test process, straight wall height and wire speed ratio have nothing to do. each layer is basically 2mm. with the dissimilar al wire feed speed ration changing from 5:5 to 9:1, straight wall will change the shape from the mixed layer to the bulge. It is seen that the aluminum body is not destroyed inside the tissue through the metallographic and grain structure observation of the cross section of the straight wall, and there are many free eutectic structures.The research shows that the tensile strength of the straight wall reaches the highest, 233.3 MPa through the vertical wall of the cross-section of the metallographic and grain structure observation. The data of no.4 and no.5 are close that reached 161MPa by SEM. it reveals that the alloying element were evenly distributed during the welding process through EDS X-ray spectrum analysis.

Keywords Additive Manufacturing Tungsten Inert Gas Welding Dissimilar metals double wire-feed Macro size mechanical property

目 次

1 绪论 1

1.1 课题背景及意义 1

1.2 增材制造技术概况及研究进展 1

1.3 本课题主要研究的内容 3

2 机器人双填丝TIG焊接系统及其设备 4

2.1 弧焊机器人-变位机TIG电弧增材制造系统 4

2.2