Method for filtering a molten solder bath

Details Method for filtering a molten solder bath Method for filtering a molten solder bath

1991-09-30

1993-01-05

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

266227, C22B 902

Patent

active

051767422

ABSTRACT:
An apparatus for filtering a molten solder bath comprises, a housing having an entrance end and an exit end enclosing a channel means extending from the entrance end to a filter means adjacent the exit end. The channel means being configured for receiving molten solder at the entrance end and directing the solder to the filter means in a turbulent flow. The filter means being configured to filter particles from the flow and direct the filtered flow to the exit end. A cooling means is positioned on the housing for cooling solder flowing through the channel means without reacting with the solder. A method for filtering a molten solder bath comprises, directing solder from the bath in a turbulent flow and cooling the flow to form a precipitate of an impurity in the molten solder. The cooled flow is filtered to remove particles and form a high-purity solder, and the high-purity solder is returned to the bath. Preferably, the molten solder is protected by an inert atmosphere that does not react with the solder.

REFERENCES:
patent: 3705457 (1972-12-01), Tardoskegyi
patent: 3897336 (1975-07-01), Bydalck et al.
patent: 4921156 (1990-05-01), Hohnerlein

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