Laser Transmission Welding With Intensity Distributions Adjusted to the Materials and the Components

The utilisation of classic Gaussian or tophat intensity distributions in the process of laser transmission welding frequently leads to inadequate processing results particularly in the case of joining members with extreme scattering. The use of intensity distributions adjusted to the materials and the workpieces promises to raise the quality of the welds with a simultaneous increase in productivity. In order to determine such intensity distributions with a high number of degrees of freedom, the inverse heat conduction problem is solved for various material configurations taking account of the scattering in the transparent joining member. The established intensity distributions can be implemented and validated using a test setup with an integrated LCoS-SLM. In comparison with welds produced using classic Gaussian and tophat intensity distributions, the welds produced in this way exhibit fewer defects, more homogeneous welding profiles and increased fracture forces.