Kaiser Aluminum Chemical Corporation

Other

Edgar G Eichhorn

Arthur C Scott

David L Childree

The present invention provides a method of joining aluminum parts by brazing, comprising the steps of (a) providing a composite sheet having an aluminum core alloy material and a filler alloy cladding, applied to the core alloy material, the cladding including about filler alloy for brazing, which includes about 4 to 18 wt. % silicon, about 0.001 to 0.4 wt. % magnesium, about 0.01 to 0.3 wt. % lithium, not more than about 2 wt. % zinc, not more than about 1.25 wt. % manganese, not more than about 0.30 wt. % iron, not more than about 0.10 wt. % copper, not more than 0.15 wt. % impurities, balance aluminum; (b) contacting an aluminum part with the filler alloy cladding; and (c) brazing the aluminum part and the composite sheet to produce a brazed assembly.

Method of joining aluminum parts by brazing using

The present invention provides a filler alloy for brazing, which includes about 4 to 18 wt. % silicon; about 0.001 to 0.4 wt. % magnesium; about 0.01 to 0.3 wt. % lithium; not more than about 2 wt. % zinc; not more than about 1.25 wt. % manganese; not more than about 0.30 wt. % iron; not more than about 0.10 wt. % copper; not more than 0.15 wt. % impurities; balance aluminum.

Aluminum-lithium-magnesium filler alloy for brazing

A novel aluminum alloy brazing composition is provided consisting of a core alloy consisting of a core alloy and a cladding on at least one side of the core alloy and wherein the core alloy consists essentially of manganese from about 0.8 to about 1.5%, silicon from about 0.45 to about 0.75%, titanium from about 0.03 to about 0.1%, a combined magnesium, copper and zinc content not in excess of about 0.15%, an iron content not in excess of about 0.3%, the total quantity of other impurities not exceeding about 0.15%, balance aluminum; and wherein the cladding consists of an AA 4XXX series aluminum alloy. The aluminum alloy brazing composition can be employed in the brazing of evaporators such as plate-fin evaporators utilized in the automotive field.

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Livermore, CA, United States of America

Edgar G Eichhorn