Metal fusion bonding – Process – Plural heat applying
Patent
1987-03-30
1989-06-20
Godici, Nicholas P.
Metal fusion bonding
Process
Plural heat applying
228240, 2281801, 2281802, 228200, B23K 3102
Patent
active
048403059
ABSTRACT:
A method for vapor phase soldering components onto a PWB onto which solder has been previously deposited includes the steps of applying a fluxing agent on the PWB and introducing the PWB into a vapor phase environment. The application of flux is a multi-step process which includes a sequential application of flux to the PWB. The vapor phase environment defines a temperature gradient between approximately ambient and the temperature of a saturated vapor of a first selected fluid which defines a primary saturated vapor phase with a boiling point which is greater than the melting point of solder. A second fluid having a boiling point which is lower than the first fluid is utilized to generate a secondary vapor blanket in order to prevent excessive loss of the fluid defining the primary vapor phase. The PWB is heated according to a controlled process in which the temperature of the PWB is continuously monitored.
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"Phase-Four" Production Systems for Vapor Phase Soldering--HTC, Pond Lane, Concord, MA 01742--1983/Pub. 37832.
Ankrom Michael J.
Bowcutt Corey H.
Buckley, Jr. John J.
Rew James A.
Cuda Carmine
Godici Nicholas P.
Sutcliff W. G.
Westinghouse Electric Corp.
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