Aluminum filler alloy containing sodium for fluxless brazing

Details Aluminum filler alloy containing sodium for fluxless brazing Aluminum filler alloy containing sodium for fluxless brazing

B - Operations, Transporting

23

K

B23K 35/22 (2006.01) B23K 35/28 (2006.01) C22C 21/02 (2006.01)

Patent

CA 2413246

An aluminum filler alloy, particularly useful in fluxless controlled atmosphere brazing (CAB), contains from about 4 % to 20 % wt.% silicon (Si) and about 0.0008 % to 0.06 % sodium (Na). In addition to the sodium, the alloy may also contain bismuth (Bi) and/or potassium (K) in the ranges of about 0.0005 % to 0.03 % K, and from about 0.03 % to 0.133 % Bi. The filler metals can be clad to aluminum core alloys preferably from the 3XXX, 5XXX, or 6XXX alloys series.

L'invention concerne un alliage d'apport à base d'aluminium, particulièrement utile pour le brasage à atmosphère contrôlée sans flux. Cet alliage contient d'environ 4 à 20 % en poids de silicium (Si) et d'environ 0,0008 % à 0,06 % de sodium (Na). En plus du sodium, l'alliage peut également contenir du bismuth (Bi) et/ou du potassium (K) selon des quantités comprises entre environ 0,0005 % à 0,03 % de potassium, et d'environ 0,03 % à 0,133 % de bismuth. Les métaux d'apport peuvent être plaqués à des alliages à âme en aluminium, de préférence des alliages des séries d'alliages 3XXX, 5XXX, ou 6XXX.

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