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首页> 外文期刊>Journal of Materials Engineering and Performance >Improving the Strength of Friction-Stir-Welded Joints of AA1100 Alloy
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Improving the Strength of Friction-Stir-Welded Joints of AA1100 Alloy

机译：提高AA1100合金摩擦焊接接头的强度

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摘要

This paper deals with the experimental analysis of Friction Stir Welding (FSW) of AA1100 aluminum alloy joined by means of a square pin tool. During the process, temperature measurement has been done by means of K-type thermocouples and it has been noticed that the temperature in the advancing side (AS) of the weld is about 20-25 degrees C higher than its retreating side (RS). The ultimate tensile strength (UTS) of the welded specimen is increased by 20% of the parent material due to the uniform dispersion of silicon particles present within the base material. Microstructural observations revealed finely arranged equiaxed grains in the nugget region of the weld. X-ray diffraction results showed the formation of alumina (Al2O3) in the weld nugget due to high heat generation and exposure to atmospheric oxygen during welding. Residual stress measurement exhibited a M-shaped distribution. The samples joined at low travel speed and high tool rotational speed showed compressive residual stress in the joint region. Residual stress of the material lying below the tool shoulder is found to be tensile in nature. Also, it has been noticed that the residual stress in the AS is superior in magnitude than the RS of the weld specimen.
机译：本文对AA1100铝合金用方销工具连接的搅拌摩擦焊（FSW）进行了试验分析。在此过程中，通过K型热电偶进行了温度测量，发现焊缝前进侧（AS）的温度比后退侧（RS）高约20-25℃。由于基材中存在的硅颗粒均匀分散，焊接试样的极限抗拉强度（UTS）增加了母材的20%。显微组织观察显示，焊缝熔核区域有精细排列的等轴晶粒。X射线衍射结果表明，由于焊接过程中产生的高热和暴露在大气中的氧气中，焊缝熔核中形成了氧化铝（Al2O3）。残余应力测量呈M形分布。在低行程速度和高刀具转速下连接的样品在接头区域显示出压缩残余应力。发现工具台肩下方材料的残余应力本质上是拉伸的。此外，已经注意到AS中的残余应力在大小上优于焊接试样的RS。

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