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

fYear

2005

fDate

17-17 June 2005

Firstpage

658

Lastpage

658

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on

Conference_Location

Munich

Print_ISBN

0-7803-8974-3

Type

conf

DOI

10.1109/CLEOE.2005.1568434

Filename

1568434