Hydrogen brazing is a specialized process that requires precise temperature control depending on the metal being brazed.
Common temperatures for copper, for example, range from 1,100 to 1,500°F.
This process involves heating components in a high-purity hydrogen atmosphere, which helps reduce surface oxides and improve the wetting characteristics of the braze alloy.
What Temperature is Hydrogen Brazing? (4 Key Factors to Consider)
1. Hydrogen Atmosphere and Temperature
During hydrogen brazing, components are heated in a furnace with a high-purity hydrogen atmosphere.
This atmosphere typically has a dew point of less than -60°F.
This environment aids in the reduction of surface oxides on the parent material, enhancing the bonding capabilities of the braze alloy.
The temperature required for this process varies depending on the material being brazed.
For instance, copper is typically brazed at temperatures between 1,100 and 1,500°F.
2. Role of Hydrogen in Brazing
The use of hydrogen in brazing is crucial for its ability to strip impurities like silica from the alloy.
This is essential for achieving high density and corrosion resistance.
For example, at a dew point of -60°C, the reduction of silica to silicon and oxygen occurs at approximately 1350°C (2462°F).
This high temperature is necessary not only for the chemical reactions involved but also to reach densities comparable to those of wrought parts.
3. Different Types of Hydrogen for Different Metals
The choice between "wet" and "dry" hydrogen depends on the metal being brazed.
Wet hydrogen is preferred for copper as it helps in removing residual hydrocarbons.
Dry hydrogen is better for metals high in oxides, such as certain types of stainless steel.
The decision to use wet or dry hydrogen can significantly affect the quality of the brazed joint.
4. Temperature and Filler Metals
The temperature during brazing also impacts the choice and effectiveness of filler metals.
The lower the brazing temperature and the higher the stabilizer content in the base material, the lower the required dew point of hydrogen gas.
For different types of stainless steels, the required dew point and brazing temperature can vary significantly, influencing the overall brazing process and the quality of the bond.
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