The strength study of ultrasonically welded thermoplastic

Abstract

The paper focuses on the field of unconventional technologies, specifically on ultrasonic welding of polymeric materials. Ultrasonic welding is one of the well-known techniques of plastic bonding, which significantly reduces the production process. It differs from other welding and connecting processes by the fact that the heat required for joining two plastic materials is obtained solely by mechanical vibrations between the connected parts. The paper aims to assess the strength of the welded specimens and then compare them with the model situation. For experimental welding, polypropylene was chosen. The specimens in the form of standardised test blades were subjected to a tensile test after welding in order to evaluate the effect of the length of the overlapping joint on the final strength of the joint. The resulting weld strength (bearing capacity) was also compared to the strength of the basic material to determine the degree of the strength loss against the basic material. © 2019 Trans Tech Publications Ltd, Switzerland.