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Flux-Fabrication VS. Assembly Consumer electronic goods and high-tech electronic equipment require electronic circuits on polymerized fabricated boards. Printed circuit board shop use copper laminated panel. The panel passes through different processes such as drilling, PTH (plated through hole), imaging, electrolytic copper plating, copper etching, masking and HASL (Hot Air Solder Leveling) or HOSL (Hot Oil Solder Leveling) that provides the protective tin/lead plating to the bare copper circuitry on the PCB. HASL and HOSL are valuable processes for PCB shops. Gyrex, Halco, Argus, and others manufacture the HASL machine. The solder pot, flux tank, pressurized hot air and air knives are built into the HASL machine. The solder used for Hal is generally Tin63/Lead37 and the flux used is non flammable, water-soluble and water washable. The solvent system is HASL flux is very different than wave solder fluxes, as HASL fluxes are much more aggressive than wave solder fluxes. The thickness of tin/lead plated on the bare copper is determined by the operating parameters, such as speed of withdrawal, air temperature, and airflow rate. During operation the excess solder is blown out of the through-holes.
As a complementary line, Qualitek will incorporate HASL fluxes to its product line. More information will be available shortly. For more information: |