Effect of Water Cooling on the Microhardness of Friction Stir Welded High-Density Polyethylene Sheets: Experimental Study

IF 0.8 Q3 ENGINEERING, MULTIDISCIPLINARY

International Journal of Engineering Research in Africa Pub Date : 2023-12-18 DOI:10.4028/p-QPbA1o

B. Moulai Ali, Djilali Bouha, Abdellah Kaou, El Bahri Ould Chikh, H. Meddah, Athmane Khalifa Bouha

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Abstract

The objective of the current work is to analyze the influence of water cooling of high density polyethylene (HDPE) sheet welding by friction stir process (FSW) on mechanical strength, based on microhardness tests. In the present work, the process using the conventional tool (C-FSW) is presented with the new procedure developed for FSW for HDPE, called water conventional friction stir welding (W-FSW). Test results for water-cooled and non-cooled welded samples were compared. HDPE sheets were initially welded by FSW process, and intensive water cooling was performed to weld after the tool exceeded the initial welding position by 30mm. The tool rotation speed of 1100 rpm and welding speed of 26 mm/min was used. The results were compared and evaluated with the hardness tests. A decrease in the hardness was observed when the sheets were treated by quenching, especially in the weld cores. It was found that the average hardness was much lower than that of untreated welded plates. Additionally, there is a region outside the core that has more or less the same stiffness value. The use of intensive quenching and conventional tooling has proven to be of great importance in improving surface finish, reducing defects, and increasing the mechanical strength of welds. The resulting recrystallization modified the hardness and thus increased the efficiency of the joint. These findings indicate the welding quality of the studied polyethylene.

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水冷对摩擦搅拌焊接高密度聚乙烯板材显微硬度的影响：实验研究

当前工作的目的是根据显微硬度测试结果，分析搅拌摩擦焊接工艺（FSW）水冷却高密度聚乙烯（HDPE）板材焊接对机械强度的影响。在本研究中，介绍了使用传统工具（C-FSW）的工艺和为高密度聚乙烯 FSW 开发的新程序，即水冷传统搅拌摩擦焊（W-FSW）。对水冷和非水冷焊接样品的测试结果进行了比较。高密度聚乙烯板材最初采用 FSW 工艺进行焊接，在工具超出初始焊接位置 30 毫米后进行密集水冷却焊接。工具转速为 1100 rpm，焊接速度为 26 mm/min。结果与硬度测试进行了比较和评估。在对板材进行淬火处理时，发现硬度有所下降，尤其是焊芯。结果发现，平均硬度远低于未处理的焊接板材。此外，焊芯外有一个区域的硬度值大致相同。事实证明，使用强化淬火和传统工具对改善表面光洁度、减少缺陷和提高焊缝的机械强度非常重要。由此产生的再结晶改变了硬度，从而提高了接头的效率。这些研究结果表明了所研究聚乙烯的焊接质量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Engineering Research in Africa ENGINEERING, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

14.30%

发文量

期刊介绍： "International Journal of Engineering Research in Africa" is a peer-reviewed journal which is devoted to the publication of original scientific articles on research and development of engineering systems carried out in Africa and worldwide. We publish stand-alone papers by individual authors. The articles should be related to theoretical research or be based on practical study. Articles which are not from Africa should have the potential of contributing to its progress and development.