Effect of welding parameters on properties of HDPE geomembrane seams Available to Purchase

The effect of various welding parameters of a dual-wedge welding technique on the physical, mechanical and chemical properties of high-density polyethylene (HDPE) geomembrane seam specimens is examined. These seams were welded with sufficient heat, insufficient heat and excessive heat at specific speeds and nip pressures. The thickness of the fusion area and the width of the air channel provided an acceptable indication of the quality of the welding. Investigation of the seam specimens' mechanical properties showed that physical ageing had occurred. The impact of welding on antioxidants was evaluated using the standard oxidative induction time (Std-OIT) test method. The Std-OIT results showed that the outer edge of squeeze-out was greatly affected by the thermal welding. Scanning electron microscopy analysis confirmed that the morphology of the outer edge of squeeze-out was altered after welding. However, the Std-OIT test on other locations of the seam specimens indicated that welding had an insignificant impact on the Std-OIT values for the particular geomembrane and welding parameters considered.