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Friction Stir Welding of High Density Polyethylene – Carbon Black Composite
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.jmatprotec.2018.09.033
J.Y. Sheikh-Ahmad , Dima S. Ali , Suleyman Deveci , Fahad Almaskari , Firas Jarrar

Abstract This investigation elucidates the important role of process temperatures in the friction stir welding of polymers. Measurements of the material temperatures were performed by means of an infrared camera and embedded thermocouples under the weld line. An inverse heat conduction method was also utilized to determine the temperature distribution in the workpiece numerically. The weld quality was determined in terms of the amount of defects present in the stir zone and the tensile strength of the joint. It was found that considerable melting occurred under the rotating shoulder and on the trailing side of the rotating pin. Movement of the molten material by the rotating tool created macro- and micro-voids in the stir zone. Crystallinity and nano-hardness measurements indicated that crystallinity was higher under the tool shoulder due to exposure to high temperatures. Tensile strength of the joint was mainly attributed to fusion welding on the top region and hot forging at the root. Decreasing the welding speed and increasing the penetration depth helped improve the weld quality.

中文翻译:

高密度聚乙烯-炭黑复合材料的搅拌摩擦焊

摘要 本研究阐明了工艺温度在聚合物搅拌摩擦焊中的重要作用。材料温度的测量是通过红外摄像机和焊接线下方的嵌入式热电偶进行的。还利用逆热传导方法以数值方式确定工件中的温度分布。根据搅拌区中存在的缺陷数量和接头的抗拉强度来确定焊接质量。发现在旋转肩部下方和旋转销的尾随侧发生了相当大的熔化。旋转工具对熔融材料的移动在搅拌区产生了宏观和微观空隙。结晶度和纳米硬度测量表明,由于暴露在高温下,工具肩部下方的结晶度更高。接头的抗拉强度主要归因于顶部区域的熔焊和根部的热锻。降低焊接速度和增加熔深有助于提高焊接质量。
更新日期:2019-02-01
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