Aluminum Fluxes

The joining of aluminum base metals has been an area of expertise at Fusion since the development of the first open flame brazing paste over three decades ago. Both brazing and soldering fluxes have been developed to join the most popular aluminum base metals.

Water Washable Fluxes

Generally about 90% of such residues may be removed by immersing the hot part in water. For more thorough cleaning, immerse parts in a 15% nitric acid/85% water solution, under agitation for 30 seconds at room temperature. Follow with two hot water (60-70°C) rinses at 20 seconds each, then a final cold water rinse.

NPA
Most potent fluxing action (contains halides) in this group. Affords the longest flux life for extended heating cycles.

NTA
Similar to NPA with controlled fluxing and non-slumping characteristics. Creamy and smooth appearance due to fine mesh filler metals. Recommended for small diameter striping applications or any time paste must stay in place.


Non-Corrosive Fluxes

Chloride-free flux that does not require post cleaning of the joint area. Flux residue has no detrimental effect on joint service life.

KNC
For use with lower melt point aluminum base metals like 6061 and 6262. Also suitable with 6063 and
3003 base metals. Pair with 1022 and 1040 filler metals.

TNC
Fluxing strength in between KNC and GNC. Use with all aluminum brazing filler metals.

GNC
Similar to TNC; specially formulated to braze 5000 series aluminum and other magnesium-containing alloys. Also suitable for other commonly used base metals.


Furnace Brazing Fluxes

FAB
A non-corrosive formulation with reduced post-brazing residue, specifically when used in air furnaces.
Pair with fine mesh aluminum brazing filler metals.

BAB
Similar to FAB with less slump and reduced post brazing residue when used in nitrogen furnaces.


Non-Corrosive Flux

ASN
A non-corrosive solder flux recommended for applications such as aluminum heat exchangers, inlet/outlet tube assemblies, condenser “piccolo” joints, and other assemblies consisting of 6061 and 6262 base metals. The flux residue left after soldering is non-corrosive, thus no flux removal is required.

Melting Range for Popular Aluminum Base Metals

Base Metal

Melting Range

1000 Series

1190-1215°F

643-657°C

3003

1190-1210°F

643-654°C

5005

1170-1210°F

632-654°C

6061

1080-1200°F

582-649°C

6063

1140-1210°F

616-654°C

6262

1078-1204°F

582-652°C

7072

1195-1215°F

646-657°C


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