Gasflux Copper to Copper

General Information

Why Gasflux on copper to copper?
The advantage when using Gasflux for the brazing of copper to copper is to
minimize the formation of oxides during the preheating and brazing process. Oxides, i.e. oxidation, will limit flow of the filler metal and prohibit good penetration into the joint. The results often seen are overheating of the copper, an over abundance of filler metal used, leaks, and unsightly appearance of the finished work.
The Gasflux Process helps prevent these oxides from forming on the surface of the copper from the start. The benefits are as follows: Better penetration of the filler metal – fewer leaks. The number one problem encountered when brazing are leaks. These tiny leaks in the form of pits or voids are the result of excessive oxidation or poor tolerances or both. The phosphorus portion of the brazing alloy serves as a “self-fluxing” property to help displace oxidation and promote flow of the alloy. However, with elevated temperatures,
all too often the phosphorus material in the alloy has expended itself or burned up during the heating process. The result is poor flow or capillary of the filler metal into the joint and a leak occurs.

Gasflux helps stop oxidation from forming on the surface and aids in the preservation of the phosphorus content in the alloy. Phosphorus is then allowed to “pull” the copper and/or silver into the joint interface where it is needed most. Reduced Filler Metal Consumption The Gasflux process reduces and /or eliminates surface oxides from forming during preheat and heating cycles. The result should be less waste of filler metal on the areas where it is not needed. A reduction up to 20 to 30% is possible. This could represent a substantial cost savings.
Quicker Brazing Times / Less Heat The Gasflux process will allow for a clean surface to run the filler metal into the joint thus allowing the brazer to “get in and get out” once the joint has been completed. The results should be quicker brazing times as well as less risk of overheating the joint that could lead to distortion or “fracturing” of the copper.