Laser Welding Innovations for Polymers and Hybrid Structures

Laser transmission welding (LTW) has emerged as a potential method for joining polymers where the hermetic sealing, and minimization of thermomechanical stresses and heat affected zone (HAZ) are crucial criteria, such as in medical equipment, electronics, electrical, microtechnology, packaging, etc. Several novel LTW techniques are developed over the years for joining polymers that differ in their laser scanning approaches, process flexibility, and cycle time. Clear welding, absorber-free welding, wobble welding and hybrid welding are among the notable advances in the LTW process. This welding process is used not only for polymer welding but also for hybrid structure welding between polymers and composites, metals, ceramics, wood, etc. LTW variants such as laser-assisted metal to polymer welding, laser-induced fusion technology are used for joining hybrid structures. This paper presents recent developments in the LTW process for joining polymers and hybrid structures; furthermore, the mechanical and morphological characterizations of the welds, as well as the advancements in LTW process simulation, are reviewed. Finally, future research directions and trends in LTW are highlighted.

Automated summary

Laser transmission welding is a method for joining polymers and hybrid structures. It has significant applications in medical equipment, electronics, and other fields. Recent research has developed various LTW techniques, including clear welding and absorber-free welding. The study also focuses on the mechanical and morphological characteristics of the welds and the simulation of the LTW process.