Aluminum brazing alloys are used to join brazeable aluminum base metals. Silicon and copper are typically added to pure aluminum to lower melting range and provide a suitable joining material. Magnesium can also be added to aluminum to assist in the facilitation of oxide dispersion in vacuum brazing. In most aluminum brazing cases, a flux is required to remove and prevent surface oxides in addition to wetting the base metal. Aluminum alloys are widely used in the HVAC, automotive, and refrigeration industries. Aluminum alloys are readily available in ChannelFluxTM and flux cored forms.
| Product | AWS | AMS | Composition | Solidus | Liquidus |
|---|---|---|---|---|---|
| AL 716 | BAlSi-3 | 4184 | AL 86% CU 4% SI 10% | 970 F | 1085 F |
| AL 718 | BAlSi-4 | 4185 | AL 88% SI 12% | 1070 F | 1080 F |
| ChannelFlux ZA-1 | - | - | AL 22% ZN 78% | 826 F | 905 F |
| ChannelFlux ZA-2 | - | - | AL 2% ZN 98% | 715 F | 725 F |