摘要本文对铝镁异种材料搅拌摩擦焊实验进行研究，在进行了大量的实验条件下，不断改进优化实验参数，以获得最佳焊缝。实验采取搭接和对接混合接头，利用加热棒给镁提前预热可以弥补两侧母材导热率的差异，焊接速度V为90mm/min，搅拌头的旋转速度ω为1300r/min是相对最佳的工艺参数，可以获得优良焊缝。其后，对试样焊缝进行电镜扫描和X射线衍射检测分析，得知焊缝内的元素及物相分布，其中主要是Mg2Al3和Mg17Al12类型的的金属间化合物，由于它的存在会使焊缝有脆性相。在适宜温度下，焊缝中不会有金属间化合物产生，而是一种具有优良力学性能的两单相分散结合的结构。33865
关键词：搅拌摩擦焊；异种金属；铝/镁合金；金属间化合物；复合热源
毕业论文设计说明书外文摘要
Title The Research on Dissimilar Friction Stir Welding between Magnesium and Aluminum Alloys
Abstract:
In this paper, the friction stir welding of Al and Mg dissimilar materials is studied, and the optimized parameters are optimized in order to obtain the best weld.. Experiments take butt and lap joints that are mixed, the heating rod to magnesium preheating can compensate for the differences between the both sides of the parent materials thermal conductivity, welding speed 90mm/min, stirrer rotational speed 1300r/min is relative to the optimal process parameters, excellent weld can be obtained. Thereafter, on weld specimens were scanning electron microscope and X-ray diffraction testing analysis, that elements within the weld transitive phase distribution, which is mainly Mg2Al3 Mg17Al12 type and the intermetallic compound, due to its presence will make the weld brittle phase. At the optimum temperature, there is no intermetallic compound in the weld, but a structure of two phase dispersion with good mechanical properties..
Keywords Friction stir welding; Aluminum alloy; Magnesium alloy; Dissimilar metal welding; Weld appearance;Mechanical properties
目录
1 绪论 4
1.1 选题背景 4
1.2 搅拌摩擦焊的原理及研究现状 4
1.2.1 搅拌针的研究现状 5
1.3 铝/镁异种合金焊接的特点和研究现状 6
1.3.1 铝/镁合金的焊接特点 6
1.3.2 铝/镁异种合金焊接的研究现状 8
1.4 几种新型铝/镁异种合金的焊接方法 9
1.4.1 真空扩散焊 9
1.4.2 激光焊 10
1.4.3 搅拌摩擦焊 11
1.5 文研究内容与意义 11
1.5.1研究内容 11
1.5.2研究的意义 12
2 试验材料和设备 12
2.1 试验材料 12
2.2 试验设备 14
2.2.1 焊接设备 14
2.2.3 检测设备 15
2.3 焊接试验流程 16
2.3.1 焊前处理 16
2.3.2 焊接工艺方法 17
3 3003铝合金的搅拌摩擦对焊 17
3.1 焊接规范 17
3.2 焊缝外观成型 17
4 铝/镁异种合金搅拌摩擦焊接工艺试验研究 19
4.1 焊接工艺参数对铝/镁异种金属搅拌摩擦焊的影响 19
4.1.1 焊缝外观成型 19
4.2 附加热源对铝/镁异种金属搅拌摩擦焊的影响 21 铝镁异种合金搅拌摩擦焊:http://www.youerw.com/cailiao/lunwen_31163.html