Single alloy solder clad substrate

A solder clad printed circuit board (100) consists of an electrically insulating substrate that has copper circuit traces (105), portions of which are solderable. A substantially planar layer (120) of a soldering composition is fused to the solderable traces, to form a solder pad that is not domed....

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Bibliographic Details
Main Authors BRADLEY, III; EDWIN L, MULLEN, III; WILLIAM B, BANERJI; KINGSHUK
Format Patent
LanguageEnglish
Published 22.04.1997
Edition6
Subjects
CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
MACHINE TOOLS
MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
PRINTED CIRCUITS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:A solder clad printed circuit board (100) consists of an electrically insulating substrate that has copper circuit traces (105), portions of which are solderable. A substantially planar layer (120) of a soldering composition is fused to the solderable traces, to form a solder pad that is not domed. The layer is composed of a mass of off-eutectic solder particles (115) that are fused together to form an agglomeration (120) having a porous structure. The solder particles are fused together by heating the off-eutectic solder to a temperature that is between the solidus temperature and the liquidus temperature of the solder. The solder is then cooled below the solidus temperature to solidify it.
Bibliography:Application Number: US19940348427