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首页> 美国卫生研究院文献>Materials >Welding Characteristics Analysis and Application on Spacecraft of Friction Stir Welded 2A14-T6 Aluminum Alloy
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Welding Characteristics Analysis and Application on Spacecraft of Friction Stir Welded 2A14-T6 Aluminum Alloy

机译：搅拌摩擦焊接2A14-T6铝合金的航天器焊接特性分析及应用

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According to the actual size parameters, the finite element model (FEM) of friction stir welding (FSW) was established, and the FEM was updated by experiments. The FSW of the 2A14-T6 high-strength aluminum alloy was simulated under a reasonable welding process parameter range, and the welding process parameters with good simulation effect were determined. The test was carried out under the same parameters, and the axial force of the FSW tool and temperature of the workpiece measuring point were collected. The comparison between the simulated data and the experimental data is reasonable, indicating the correctness of the FEM. The microstructure analysis of the welded joint shows that the grain size in the upper part of the weld nugget was smaller than that in the middle and lower parts, and there are obvious boundaries of grain size in each region of the joint. The hardness of the joint in the upper layer is higher than that in the middle and lower layers, and the minimum Vickers hardness value of the joint appears near the interface between the thermo-mechanically affected zone and the heat-affected zone on both sides of the weld. Tensile testing shows that the strength coefficient of the joint reaches 82.5% under this process parameter, and the sample breaks at the intersection of the material flow during stretching. After analyzing the final mechanical properties of the joint, we found that a degree of aerospace application can be achieved. Under this parameter, the welding test was carried out on the top cover of the rocket fuel tank. Firstly, melon valve welding, which is relatively difficult in welding conditions, was carried out, and a high-quality joint with good surface and no defects was obtained.
机译：根据实际尺寸参数，建立了搅拌摩擦焊（FSW）的有限元模型（FEM），并通过实验对其进行了更新。在合理的焊接工艺参数范围内模拟了2A14-T6高强度铝合金的FSW，确定了模拟效果良好的焊接工艺参数。在相同的参数下进行测试，并收集FSW工具的轴向力和工件测量点的温度。仿真数据与实验数据的比较是合理的，表明了有限元方法的正确性。焊接接头的显微组织分析表明，焊接熔核上部的晶粒尺寸小于中下部的晶粒尺寸，并且在接头的每个区域都有明显的晶粒尺寸边界。上层接头的硬度高于中下层接头的硬度，接头的最小维氏硬度值出现在热力学影响区和热影响区两侧的界面附近。焊缝。拉伸测试表明，在此工艺参数下，接头的强度系数达到82.5％，并且样品在拉伸过程中在材料流的交点处断裂。在分析了接头的最终机械性能之后，我们发现可以实现一定程度的航空航天应用。在此参数下，在火箭燃料箱的顶盖上进行了焊接测试。首先，进行在焊接条件上相对困难的瓜阀焊接，并且获得具有良好表面且无缺陷的高质量接头。

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