Thomas D. Ewald, Norbert Holle, Klaus-Jurgen Wolter
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In the present study the interaction between solder paste and the PCB surface finish and its impact on void formation was investigated. Therefore, a comprehensive set of tests was performed on test vehicles with different diameter of the solder powder, solder alloy composition, PCB surface finish and flux chemistry. Based on these experimental results a hypothesis of void generating mechanisms is presented characterizing the wetting process.
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