Metal fusion bonding – Including means to apply flux or filler to work or applicator – Gaseous flux
Patent
1996-01-18
1997-03-18
Heinrich, Samuel M.
Metal fusion bonding
Including means to apply flux or filler to work or applicator
Gaseous flux
228223, B23K 300
Patent
active
056114761
ABSTRACT:
A solder reflow convection furnace employing flux collection and heating to minimize flux and solvent build up and gas densification to reduce input gas flow is disclosed. As solder melts in the furnace, an effluent of vaporized flux is driven off and can condense on cooler components. To minimize such condensation, the gas is directed through a cooling system in which the flux condenses, and the cooled, cleaned gas is directed into the furnace's product cooling section. In another embodiment, in which the gas in the furnace is recirculated, a cooling coil is located upstream of the recirculating gas mover to heat the primary gas. The vaporized flux condenses on the cooling coil, which can be readily removed and replaced. In another aspect of the invention, when the furnace employs a gas amplifier, the recirculating gas is cooled prior to reentry into the heating chamber, which increases its density and removes flux by condensation. Upon reentering the heating chamber, the cooler, denser gas undergoes a greater expansion than would return hot gas, thereby increasing the pressure in the chamber and correspondingly increasing the velocity of the output flow to the process area. The increased velocity allows reduction of consumption of the primary gas and increases the efficiency of heat transfer.
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Couilliard Robert P.
LeMieux Pierre J.
Nutter Francis C.
Soderlund Martin I.
Waugh Arthur
BTU International
Heinrich Samuel M.
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