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Solder Short
Solder shorts on the top side of a printed board is unusual but it can occur. In the example the solder shorts were seen on IC leads on a single sided printed board. During contact with the wave the pressure was so high that shorts occurred due to excessive solder penetration. This type of defect is more likely to be seen on any of the vibrating waves produced by three companies to aid surface mount assembly. It would be more likely to occur on single sided board as the hole size to lead ratio is often larger due to the tolerances on these cheaper laminates.