Hydrogen brazing is a metal joining technique where the parts (usually ceramic, steel or oxygen-free copper) are joined together in a high temperature hydrogen environment. The alloys (or braze filler material) are usually a combination of copper, nickel and precious metals.
Hydrogen brazing often leaves material very bright and shiny. The hydrogen acts as a cleaning agent to remove oxides.
Vacuum brazing is a metal joining technique where the parts, including ETP copper, are joined together in a high temperature vacuum environment. The alloys used are similar to those used for hydrogen brazing.
In Vacuum brazing, the vacuum acts as the flux or cleaning agent for the parts, helping remove oxides to facilitate brazing and bonding sites.
Partial Pressure brazing is very similar to vacuum brazing, and is done in a vacuum furnace. A gas is introduced to increase the vacuum level and to facilitate specific processing. Partial pressure gases include nitrogen, argon and hydrogen.
Torch brazing, or “silver solder”, is an effective way to braze parts where a localized heating zone is required. This is a hand process, where experience and craftsmanship are required for optimum results. ThermoFusion is one of the last torch brazing companies in Northern California.
Aluminum Dip Brazing
Aluminum dip brazing uses a liquid salt bath as the flux. It is more versatile than vacuum aluminum brazing for intricate or multiple joints. Several tests are available to ensure and certify that there is no residual salt left after the braze.