Optimalization of laser soldering process

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Supervisor:
Hajdu István
Department of Electronics Technology

During my work I reviewed the selective soldering technologies, in particular the laser soldering procedures. I presented the structure of the lasers, the advantages and disadvantages of different lasers in soldering point of view. Current industrial applications in the market were also compared according to several aspects.

I presented the structure and the operation of the soldering station which were used for the preparation of the samples, and the features of the laser unit which was installed into the station. I learned to use the station during soldering trials. I described the criteria to evaluate the solder joints. I set up a test system to determine the proper soldering temperature. I presented the background and objectives of the test system’s elements. I described the process of the studies and presented the tools which were used during the analysis.

The required amount of solder was determined with empirical analysis, and sample groups were formed in accordance with the soldering temperatures. Non-destructive and destructive analyses were also performed on the samples. Optical microscopic and x-ray pictures were taken; tensile tests were carried out and a cross-section analysis was performed. Conclusions were drawn from the results of the tests; the evaluation was confirmed by comparative and explanatory diagrams. I have determined the ideal soldering temperature with performing the analysis.

Based on the processed results of measurements and experience a more accurate experimental design could be made. With help of this experimental design the ideal soldering temperature profile parameters could be described more accurately and it can also be improved with lifetime tests, such as environmental simulation test in combination with cross section analysis.

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