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Identification of Friction Stir Welding Joint Areas in Crevices of Polyethylene Pipes

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Abstract:

The application of high-density polyethylene (HDPE) pipes in water and natural gas distribution systems is rapidly increasing. While the mechanical strength of HDPE pipes is well established, welding remains a critical issue affecting structural integrity and performance. This study investigates the repair of defective HDPE pipes and proposes a simple approach for identifying weld zones. Artificial longitudinal notches were introduced into 125 mm diameter HDPE pipes and repaired using friction stir welding. Welding parameters optimized from previous studies were applied, with best results obtained at a tool rotation speed of 1100 rpm and a welding speed of 30 mm/min, producing defect-free welds. Weld zone identification was performed using static projection radiography with images taken parallel and perpendicular to the pipe diameter, enabling clear distinction of three weld zones and the base material. Hardness measurements across the welded cross-section confirmed the radiographic findings. The results provide insight into weld bead microstructure and support future studies on the mechanical characterization of individual weld zones.

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International Journal of Engineering Research in Africa Vol. 79 View Preview

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Periodical:

International Journal of Engineering Research in Africa (Volume 79)

Pages:

65-81

DOI:

https://doi.org/10.4028/p-l5r2bB

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Online since:

June 2026

Authors:

Djilali Bouha*, Boudjellel Moulai Ali, Abdellah Kaou, Hadj Miloud Meddah, Abdel Nour Zaim, Belaid Taharou

Keywords:

Friction Stir Welding (FSW), High-Density Polyethylene Pipe (HDPE), Micro-Hardness (HV), Static Projection Imaging (radiography), The Weld Structure

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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