Abstract
Thermal and residual stresses induced in transparent thermoplastic resin during laser welding process are analyzed by photoelastic method in order to discuss the relationship between residual stress and welding strength. Photoelastic fringes indicating contours of the principal stress difference showed that stresses caused by thermal expansion and contraction appeared at the welded portion, but they disappeared gradually after irradiation of laser. At the same time, new residual stresses appeared near the edge of the welded portion. Numerical simulation at a welding edge with normal and tangential stresses indicated a similar profile of principal stresses difference as that shown in the experiment. The welding strength monotonically increased with the degree of fringes at the edge of welded portion.
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