Computerized simulation and experimental investigation of laser soldering of PECT: modeling and verification

Abstract

In this paper, we propose laser-soldering method and use the process assisted with wire-mesh and soldering paste to weld the lateral electrode of piezoelectric ceramics transformer (PECT). The PECT were connected very well and were not affected much by heat. The process shows the good promise to the joint problems in multilayer heterogeneous lamination similarity to the PECT. Based on the above, our focus is on validating the finite element model, we build three-dimensional model of laser soldering temperature field in multilayer materials. Then, the reasonable simplification of heat source, materials parameters are put up in order to perform an efficient finite element analysis and the adaptive finite element technique is adopted. The temperature distribution characteristic in the laser soldering is acquired and verified by comparing experimental data. Although the finite element model contains numerous simplifications, the differences between experimental data and computed results are within 5%. The study shows that the adaptive finite element schemes give good agreement with the experimental data, which provides the theory reference for formulating correct process and optimizing joint properties. In addition, more exact material properties would improve the solution accuracy.