Brazing is a crucial process in metalworking, and choosing the right shielding gas is essential for its success.
7 Key Points to Consider
1. Argon as the Preferred Shielding Gas
Argon is the most commonly used shielding gas for brazing.
2. Inert Properties of Argon
Argon is favored because of its inert properties, which prevent it from reacting with the metals being brazed.
3. Suitability for Vacuum Furnaces
Argon is particularly suitable for use in vacuum furnaces, where it helps maintain a controlled atmosphere free from oxidants, oxygen, and water.
4. Purity Requirements for Argon
The purity of argon used in brazing is critical. Higher purity levels are typically required to ensure the effectiveness of the shielding.
5. Additional Materials for Enhanced Brazing
To further enhance the brazing process, especially on stainless steel surfaces, BF3 gas flux or self-fluxing solders containing lithium or boron can be used.
6. Alternative Gases
While argon is the preferred shielding gas, alternatives such as nitrogen, helium, and even hydrogen under controlled conditions can be used.
7. Safety and Precautions
Despite its benefits, argon can be dangerous if not handled properly. Proper ventilation and monitoring are essential when using argon as a shielding gas.
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