Determination of Equilibrium Shapes and Optimal Volume of Solder Droplets in the Assembly of Surface Mounted Integrated Circuits.

摘要: The equilibrium shape of a liquid meniscus at liquid-gas phase boundary system in which solid, liquid, and gaseous phases coexist is given by balance forces acting on the system. A method calculation was introduced Part I this series for determining shape. Here, used to calculate shapes solder joints surrounding gullwing jbend type lead wires present surface mounted integrated circuits. study also done determine optimal volume needed produce good joint. Criteria are established, dimensionless calculations leads, outlined applying these results with different geometries.