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Brazing is a process used to combine materials in a wide variety of applications, including jewelry, high-temperature ceramics, culinary cutlery, bathroom faucets, automotive engines, jet aircraft engines, and air-conditioning systems.
FREMONT, CA: Brazing, which utilizes various heat sources, is frequently categorized according to the heating method used. Some ways heat simply the common area, while others heat the entire assembly (diffuse heating).
Below are some of the more popular methods:
Techniques for Localized Heat Treating
Brazing using a torch
The heat required to melt and flow filler metal is supplied by a fuel gas flame in this approach. A flame is formed when acetylene, hydrogen, or propane is mixed with oxygen or air. This technique is easily automated and requires little investment in cash. Since torch brazing needs the use of a flux, a post-braze clean is frequently needed.
Brazing by Induction
High-frequency induction heating is a clean and quick method of brazing that allows for precise control of the temperature and position of the heat. Heat is generated when a nearby coil induces a quickly alternating current into the workpiece.
Brazing Against Resistance
This is a method in which heat is generated by resistance to an electrical current running through a circuit that includes the workpieces (as with induction brazing). The process is especially appropriate to very simple joints in high-conductivity metals.
Techniques for Diffuse Heat Treating
Brazing in the Furnace
Furnace brazing has two primary advantages: protective atmosphere brazing (in which ultrapure gases or vacuum eliminate the need for flux) and the ability to precisely control each stage of the heating and cooling cycles. Heating is accomplished by the use of elements or by gas firing.
Brazing in the Dip
This procedure involves completely immersing the assembly in a bath of molten braze alloy or molten flux. In both circumstances, the bath temperature is below the parent metal's solidification point but above the filler metal's melting point.