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Whether for power electronics, electronic aviation systems, medical equipment or electronic systems for the automotive industry, voids in solder joints represent one of the main problems. Enclosed voids can cause a displacement of electrical and thermal paths as well as a local concentration of power and heat.
Additionally, gas voids are quick to form spheres in the solder gap, which could cause the tilting of chip components and a wedge-shaped solder gap.
The amount of voids can be influenced by different measures such as a good wettability of metallization, solder pastes with special adopted solvents and an adequate preheating profile. However, to achieve virtually void-free solder joints, a special vacuum process step during soldering was demanded.
This vacuum process is associated with some essential disadvantages. Apart from the technical expenses for vacuum pumps and additional locks, the vacuum process excludes the use of gas convection for heating, resulting in an uneven heat distribution on the assemblies.
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