Title :
Influence of thermal stresses in modelling the lap welding of thermoplastic films
Author :
Coelho, João M P ; Abreu, M.A. ; Rodrigues, F. Carvalho
Author_Institution :
Optoelectron. Dept., Inst. Nacional de Engenharia, Tecnologia e lnovacao, Lisboa
Abstract :
Our study has shown that the influence of the thermal stresses and expansion and contraction forces acting during and after laser action plays an ultimate role on the achievement of strong welds, that is, weld with tensile strength higher than 80% of that of the original thermoplastic. This has direct influence on engineering parameters, making necessary to have a minimum laser beam diameter on the welding volume. Introduction of this factor on the model allowed the achievement of lap welding speeds up to 14 m s-1, as well as cutting with welding through this new transmission welding technique
Keywords :
laser beam welding; laser materials processing; plastics; tensile strength; thermal stresses; contraction forces; expansion forces; lap welding; laser action; laser beam; laser cutting; laser welding; tensile strength; thermal stresses influence; thermoplastic films; transmission welding technique; weld; welding volume; Laser beam cutting; Laser beams; Laser modes; Laser theory; Materials processing; Optical films; Optical materials; Tensile stress; Thermal stresses; Welding;
Conference_Titel :
Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on
Conference_Location :
Munich
Print_ISBN :
0-7803-8974-3
DOI :
10.1109/CLEOE.2005.1568434
