Laser intensity and surface distribution identification at weld interface during laser transmission welding of thermoplastic polymers: A combined numerical inverse method and experimental temperature measurement approach

• Published in: Polymer engineering and science Vol. 63; no. 9; pp. 2795 - 2805
• Main Authors: Le, Anh-Duc, Asseko, Andre Chateau Akue, Nguyen, Thi-Ha-Xuyen, Cosson, Benoit
• Format: Journal Article
• Language: English
• Published: Newtown Society of Plastics Engineers, Inc 01-09-2023; Blackwell Publishing Ltd; Wiley-Blackwell
• Subjects: Analysis; Composite materials; Engineering Sciences; Interfaces; Inverse method; Laser beam welding; Lasers; Mathematical models; Measurement; Measurement methods; Methods; Polylactic acid; Polymer industry; Polymeric composites; Polymers; Production processes; Temperature measurement; Temperature measurements; Thermocouples; Thermoplastics; Welding; United States
• ISSN: 0032-3888; 1548-2634
• DOI: 10.1002/pen.26405

The determination of the laser intensity profile necessary to weld two thermoplastic parts is crucial for understanding and optimizing the laser welding process in polymers and composite materials. Traditional methods of measuring the laser beam intensity profile, such as laser beam profiling techniques, can be difficult to implement and expensive. In this paper, we present the development of a technique that combines a numerical inverse method with experimental temperature measurements to determinate the laser intensity distribution at the weld interface. This technique does not require specialized or expensive equipment and accounts for variations in laser beam intensity caused by different components and interfaces. The technique uses thermocouple sensors to measure interface temperatures during welding, and an analytical gaussian model to estimate the laser intensity distribution at the weld interface. The model is then used as input data in a numerical heat transfer model. The technique is validated through experimental investigations on transparent and absorbent Polylactic acid polymers.