Brazing flux and method of using the same
US5156326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K35/3605
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention provides a brazing flux for brazing metal and a method of using the same. More particularly, the invention provides a brazing flux for use in joining pieces of aluminum or aluminum alloys. The brazing flux comprises from about 62 percent by weight to about 74 percent by weight hydrated potassium cryolite and from about 26 percent by weight to about 38 percent by weight AlF.sub.3. The hydrated potassium cryolite comprises K.sub.3 AlF.sub.6 and K.sub.2 AlF.sub.5.H.sub.2 O. Preferably, the brazing flux is substantially free of KAlF.sub.4 and unreacted KF. More particularly, the brazing flux contains no KAlF.sub.4 and no unreacted KF. The brazing flux is capable of displaying a melting temperature as low as 560.degree. C. (1040.degree. F.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.