A method and apparatus for producing flush solder fill over recessed pins and over passage holes in circuitized substrates. A substrate carrying rack is immersed in a vessel of molten solder after it has been similarly immersed in a flux bath. While in the molten solder, the rack is vigorously agitated....http://www.google.fr/patents/US4799616?utm_source=gb-gplus-shareBrevet US4799616 - Solder leveling method and apparatus
