PC and PMMA differ in optical and thermal properties. PMMA has a high transmittance to laser beams, while PC has a relatively low transmittance. Therefore, during the laser welding process, for PC, the laser energy will mainly be absorbed near the welding surface, resulting in melting and forming a weld; while for PMMA, the laser energy can penetrate the material and heat the welding contact surface.

PC (polycarbonate) and PMMA (polymethylmethacrylate) are two common engineering plastics that are widely used in many fields. For both materials, laser welding is a viable welding method, but there are some specific factors to consider.

First, PC and PMMA differ in optical and thermal properties. PMMA has a high transmittance to laser beams, while PC has a relatively low transmittance. Therefore, during the laser welding process, for PC, the laser energy will mainly be absorbed near the welding surface, resulting in melting and forming a weld; while for PMMA, the laser energy can penetrate the material and heat the welding contact surface.

Secondly, the melting points and thermal expansion coefficients of PC and PMMA are also different. During the laser welding process, it is necessary to ensure that the welding contact surface temperature of the two materials is appropriate to avoid uneven welding or insufficient melting caused by excessively high or low temperatures. In addition, due to the different coefficients of thermal expansion of the two materials, the effects of thermal stress may need to be taken into account during the welding process to avoid cracks or deformation.

In general, although PC and PMMA can be welded using lasers, careful consideration and adjustments are required in selecting appropriate welding parameters, controlling temperature and thermal stress during the welding process, and optimizing the design of the welding contact surface. To ensure ideal welding results.