Experimental Study of the Possibility of Butt Friction Stir Welding on Polyethylene Pipes

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

In Algeria, polyethylene (PE) pipes are commonly installed for the distribution of potable water and natural gas in urban and rural areas. They are used for economic reasons, in addition to perfect maintenance, compared to metal pipes. The experiences of these tube installations have shown technical advantages in operational safety aspects and structures lifespan with very interesting mechanical properties. The connection between the polyethylene pipes is done through couplings, which are considered expensive during their replacement due to frequent use, especially in the agricultural field. The main objective of the present experiment is to elicit the main parameters of friction stir welding on polyethylene pipes (butt welding) using a milling machine, especially the rotational speed of the clamped pipe sections called the rotational welding speed, which replaced the welding speed, with the highlighting of the clamping device to form a butt joint. In the present work, the process using the conventional tool is presented with the design and provision of a pipe assembly device intended for this research in order to weld these pipes together during the FSW process. The rotary device used in this experiment is mounted on a milling machine and rotates the tube sections attached to the rotating arms of the support. The spindle can rotate freely 360 ̊ with the tool's rotating speed of 1100 rpm. Two sections of high-density polyethylene pipes with an outer diameter of 125 mm, which are intended for natural gas distribution, were successfully welded to achieve the conventional friction stir welding (C-FSW) reliability of polyethylene pipes. This study makes it possible to highlight the parameters and the method, on which it is recommended to improve welded joints, in the context of research that will always be ongoing.
聚乙烯管道对接摩擦搅拌焊接可能性的实验研究
在阿尔及利亚,聚乙烯(PE)管道通常安装在城市和农村地区,用于输送饮用水和天然气。与金属管道相比,使用聚乙烯管道不仅经济实惠,而且维护方便。这些管道安装的经验表明,聚乙烯管在操作安全和结构寿命方面具有技术优势,而且具有非常有趣的机械性能。聚乙烯管道之间的连接是通过接头完成的,由于使用频繁,特别是在农业领域,接头的更换费用较高。本实验的主要目的是确定使用铣床对聚乙烯管进行搅拌摩擦焊接(对接焊)的主要参 数,特别是被称为旋转焊接速度的夹紧管段的旋转速度,它取代了焊接速度,并突出了夹 紧装置以形成对接接头。在本作品中,介绍了使用传统工具的过程,并设计和提供了用于本研究的管道组装装置,以便在 FSW 过程中将这些管道焊接在一起。本实验中使用的旋转装置安装在铣床上,可旋转连接到支架旋转臂上的管段。主轴可以 360 ̊ 自由旋转,工具的旋转速度为 1100 rpm。成功焊接了两段外径为 125 毫米的高密度聚乙烯管道,用于天然气输送,实现了聚乙烯管道传统搅拌摩擦焊接(C-FSW)的可靠性。这项研究使我们有可能在持续研究的背景下,强调建议改进焊接接头的参数和方法。
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