Abstract

The aim of this study was to investigate the weldability of high-density polyethylene sheets via heat assisted friction stir welding and effect of process parameters on microstructure and mechanical properties of welded plates. The parameters under study were included pin rotational speed, transverse speed of tool and shoulder temperature. Tensile and bend tests were done in order to evaluate mechanical behavior of material. The results showed that polyethylene plates could be welded with joint characteristics similar to base material. This could be accomplished by operating with a high shoulder temperature and rotational speed as well as low transverse speed. Moreover, when process parameters were properly selected to provide sufficient heat, the weld nugget would extend to base material. Consequently, a remarkable improvement was observed in joint efficiency. Also, based on microstructure observations and mechanical test results, it could be concluded that, tool coating improved mechanical properties and surface quality of weld.

Key words: Friction stir welding, polyethylene, mechanical properties, microstructure.

Abbreviation

FSW, Friction stir welding; PE, polyethylene; HDPE, high density polyethylene.