Vapor phase soldering (VPS), also known as condensation soldering, has gone through changes in popularity. It was the process of choice in the early 1980s, but its use declined considerably for two reasons: problems with the VPS process itself and improvements in IR processes. The problems with VPS are mostly higher defects, such as wicking in leaded parts and tombstoning in chip components. The convection-dominant IR system provides efficient heating without the inherent problems of VPS.
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