Brazing with natural gas is not recommended due to its composition and potential dangers. Natural gas contains impurities like ethane, propane, ethylene, H2S, CO2, and nitrogen, which can affect the catalytic activity and stability during the brazing process. Additionally, the use of hydrogen in brazing is considered dangerous due to its reactive nature and potential for creating hazardous conditions.
The primary concern with using natural gas in brazing is the presence of impurities that can interfere with the brazing process. Experiments have shown that when natural gas mixtures are heated, they can undergo complete conversion of components like ethane and propane into hydrogen and unconverted methane. This reaction can lead to the production of secondary gaseous products, which may not be suitable for maintaining the required atmosphere conditions for effective brazing.
Furthermore, the recommended atmosphere conditions for brazing typically involve a low dew point, low oxygen levels, and the use of inert gases like nitrogen or argon. These conditions are chosen to prevent oxidation and ensure the integrity of the brazed joints. Inert gases like argon are preferred because they do not react with the metals being brazed, ensuring a stable environment for the brazing process.
While hydrogen can theoretically be used to prevent oxidation, its high reactivity and potential for creating explosive mixtures make it a dangerous choice for brazing. The risks associated with using hydrogen outweigh any potential benefits, especially when safer alternatives like inert gases are available.
In summary, brazing with natural gas is not advisable due to the presence of impurities and the potential dangers associated with hydrogen. It is safer and more effective to use inert gases like nitrogen or argon, which meet the necessary conditions for successful brazing without the risks associated with natural gas.
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