Abstract
Ultrasonic welding (USW) is a promising method for the welds between dissimilar materials. Ultrasonic thermal welding by the third phase (TWTP) method was proposed in combination with the formation of a third phase, which was confirmed as an effective technology for polymer welding between the two dissimilar materials compared with the traditional USW. This review focused on the advances of applying the ultrasonic TWTP for thermoplastic materials. The research development on the ultrasonic TWTP of polycarbonate (PC) and polymethyl methacrylate (PMMA), polylactic acid (PLA) and polyformaldehyde (POM), and PLA and PMMA are summarized according to the preparation of the third phase, welded strength, morphologies of rupture surfaces, thermal stability, and others. The review aimed at providing guidance for using ultrasonic TWTP in polymers and a basic understanding of the welding mechanism, i.e., interdiffusion and molecular motion mechanisms between the phases.
Highlights
Thermoplastic materials have drawn much attention as alternatives to thermoset materials in many fields due to their advantages such as low cost and effective manufacturing [1]
Ultrasonic welding (USW) is a convenient way for polymers welds, and it is a promising method for welds between dissimilar materials
This review focused on the thermal welding methods for polymers
Summary
Thermoplastic materials have drawn much attention as alternatives to thermoset materials in many fields due to their advantages such as low cost and effective manufacturing [1]. USW can overcome the problems such as stress concentrations and delamination due to hole drilling in mechanical fastening, and toxicity, surface modification, and environmental damage in adhesive bonding. It can solve the main point relating to the cost of productions. Many adhesives and adhesion technologies [14,15,16,17,18,19] are available due to the diversity of used materials, but the toxicity problem during welding remains This accelerating trend requires a new reliable technology to weld thermoplastics, especially for welding dissimilar materials [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38] in industry
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