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Morphological and mechanical properties of hot gas welded PE, PP and PVC sheets

Author(s): O. Balkan | H. Demirer | H. Yildirim

Journal: Journal of Achievements in Materials and Manufacturing Engineering
ISSN 1734-8412

Volume: 31;
Issue: 1;
Start page: 60;
Date: 2008;
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Keywords: Welding | Hot gas welding | Energy | Plastic | Polymer

Purpose: The goal of the paper is to investigate morphological and mechanical properties of hot gas butt-welds on polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) sheets for four different procedures, which are single and double V-welds with and without a welding shoe.Design/methodology/approach: Welding energy (Ew), which is transferred onto weld surfaces, was calculated to evaluate weld quality. Morphology of welds was analyzed by polarized light, stereo, and scanning electron microscopy.Findings: Polarized light microscopy studies indicated that the heat-affected zone (HAZ) consists of welding rod core, molten zone, and deformed spherulitic zone. The results of tensile, bending, and impact tests indicated that the weld strengths of PVC sheets are lower than those of PE and PP sheets. When the welding shoe was used, weld strength increased significantly for each material due to the presence of sufficient welding pressure and the effective heating on surfaces.Practical implications: The best results were attained for the double V-welds with the welding shoe.Originality/value: Morphological and mechanical properties of hot gas welded PE, PP and PVC sheet were evaluated.
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