Aluminum Company of America

George D Wilkinson

William D Vernam

William A Anderson

Aluminum brazing sheet is produced from a composite assembly comprising an ingot of aluminum alloy, at least one side of the ingot provided with a layer of an aluminum brazing alloy consisting essentially of not greater than 0.35 wt.% magnesium and 6.0 to 13.0 wt.% silicon, the remainder aluminum and incidental impurities. A layer of aluminum for rolling purposes is provided on at least one of said ingot and said brazing layer, the rolling layer being substantially free of elemental silicon and consisting essentially of 0.2 wt.% Cu max., 0.4 wt.% Fe max., 0.05 wt.% max. for both Mn and Ti, up to 1.0 wt.% Mg, the remainder aluminum and incidental impurities. The composite assembly is hot bonded by rolling in a reversing mill and thereafter formed into brazing sheet in a continuous rolling mill.

Production of aluminum brazing sheet

Aluminum brazing sheet is produced by providing a composite assembly comprising an ingot of aluminum alloy and a layer of an aluminum brazing alloy on at least one side of the ingot. Provided on both sides of the composite assembly is a second layer of aluminum alloy substantially free of eutectic or elemental silicon. The composite assembly and the second layer are hot bonded and formed into brazing sheet by steps including hot rolling in a reversing mill followed by hot rolling in a continuous mill.

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Maryville, TN, United States of America

George D Wilkinson