What is Nocolok brazing?
The NOCOLOK® flux brazing technology is the industry standard for brazing aluminium heat exchangers and other components. Aluminium brazing is used in the automotive industry, in the production of air-conditioning systems, refrigerating systems, domestic and electrical appliances.
What is aluminum braze?
The process of brazing refers to the use of gas generated heat (800 degrees F), and an iron-free filler such as aluminum to join to different metals. The aluminum itself can also be used to replace a part of another metal that might have cracked or fallen off.
What type of flux is used for aluminum?
Historically, corrosive flux has been the standard for joining aluminum materials. Corrosive flux is water-soluble, containing both chloride and fluoride salts. Residues can be washed off the parts with a solution of nitric acid and water, and the resulting braze joint has a clean appearance.
What gas is used for brazing aluminum?
Most commercial gas mixtures are acceptable for flame brazing Al: oxygen – propane. oxygen – methane. oxygen – natural gas.
Is brazing safer than welding?
Even though the metal surfaces are never melted, the metallurgical bond created through brazing allows for a strong and secure joint. And since it uses lower temperatures, it’s typically safer to perform than welding. Furthermore, the metal surfaces joined with brazing are able to retain their original properties.
Is brazing aluminum difficult?
Brazing aluminum is more difficult than brazing other metals because the melting points of the base metal and the filler are close together, and because of the oxide layer present on the surface of aluminum. All aluminum base metal alloys will be annealed at the temperatures required for brazing.
Can I solder aluminum to copper?
Aluminium and copper can’t be soldered together, the bond will not happen. Using specialized welding techniques they can be joined, but it is not commonly done in the field. An aluminium and copper wire can be connected using the proper connection method, but not directly in contact with each other.
Can I braze aluminum with a propane torch?
Yes, you can weld aluminum with a propane torch and aluminum brazing rods as long as it is for non-structural metals that are not weighted or stressed or critical parts.
What temperature do you braze aluminum?
Brazing temperature range would be 1049-1085°F (565-585°C) depending on the filler metal used. It is necessary to use a heating step at a soak temperature just below the solidus point of the filler metal to ensure all the parts and joints to be brazed reach the correct temperature at approximately the same time.
Is brazing permanent?
Brazing is an economical method for making strong, permanent metal joints.
This flux and the process for using it is called the NOCOLOK® flux brazing process. Production. NOCOLOK® flux is produced in the liq- uid phase using Al(OH)3, HF and KOH as raw materials as indicated in the process flow diagram.
What is a brazing method?
A brazing method was thus developed using a non-hygro- scopic and in standard applications non-corrosive potassium fluoroalumi- nate flux which successfully removes the oxide film on aluminum, does not react with aluminum in the molten or solid state and whose residue is only very slightly soluble in water.
What is the shelf life of Nocolok flux?
NOCOLOK®flux is non-hygroscopic and only very slightly soluble in water (0.2% to 0.4%). The shelf and pot life of the flux is therefore indefinite. The flux does not react with aluminum at room temperature or at brazing tem- perature and only becomes reactive when molten (at least partially molten).
What is Nocolok®?
NOCOLOK®is a registered trademark of Solvay Fluor GmbH, Germany Disclaimer: All statements, information, and data given herein are believed to be accurate and reliable but are presented without guarantee, warranty or responsibility of any kind, express or implied.