Application of solid-state joining to investigate the Bi-polymer (PEHD-PP) joints performance

Over the past ten years, the use of polymer products has taken a huge step forward in all sectors. The multiple properties of polymer types are positive factors that increase their scope of use in all aspects of daily life. Obtaining an ideal product requires assembling the polymers as needed. Friction welding is considered the safest way to connect polymer parts without any additional means. Welding two parts of the same polymer depends on controlling the effective factors in this process, which are the rotation speed, the feed, the penetration force, and the residence time of the spot weld. In this article, pneumatic energy is used to weld HDPE to PP by friction stir (linear and point) by selecting the ideal welding agents that meet the mixture of these two types of polymers and respond to pneumatic energy. The response surface method (RSM) and analysis of variance (ANOVA) were used to analyze the thermal results. The tensile test also has a role in deducing the mechanical properties of the welded area resulting from the mixture of these two types of polymers.