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Brazing

Expert solutions to help you succeed

​Gas atmospheres for brazing can vary depending upon your base materials, process, part quality and cost considerations. Commonly used industrial gas atmospheres for brazing include nitrogen, hydrogen, nitrogen/hydrogen mixtures, nitrogen/methanol mixtures, argon and argon/hydrogen mixtures. Air Products applications engineers can help you select the right brazing atmosphere tailored to your process requirements for reducing potential, wettability, soot prevention, as well as maintaining excellent and repeatable braze quality. ​

​Brazing Expertise and Solutions

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Tailor atmosphere composition to optimize part strength and integrity.

Product surfaces remain clean without sacrifice to product quality and strength. Wettability can be controlled

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Stringent atmosphere control

Dew point-to-hydrogen ratio variability allows for the brazing of high-carbon steels, stainless steels, and nonferrous metals

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Improve mechanical strength and surface quality

Consistent control of filler metal flow improves brazed joint strength and surface quality

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Optimize braze wettability

Furnace dew point and hydrogen content flexibility allows atmosphere reducing potential to be controlled

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Clean brazing surfaces

Air Products’ Atmosphere Solutions can produce humidified atmospheres to improve the brazing surface

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Prevent decarburization

For brazing medium- or high-carbon parts, nitrogen atmospheres are conducive to preventing decarburization

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Ask the Expert

​Tom Philips
Tom Philips

Applications Engineer

What is the optimum atmosphere system for furnace brazing stainless steel components?

Traditionally, the atmosphere used in stainless steel brazing has been dissociated ammonia. However, due to cost, safety and environmental concerns with the storage and use of anhydrous ammonia, companies are converting to a nitrogen/hydrogen blended gas mixture. A nitrogen/hydrogen atmosphere can also help you improve flexibility in your operation and minimize the potential for nitriding. If you need to produce high quality, bright, stainless steel components, an atmosphere composition with a minimum concentration of 25% hydrogen should be adequate. Or, you can achieve higher corrosion resistance and better hermetic sealing for your steel components with an atmosphere containing up to 80% hydrogen. To produce a well brazed joint, it’s important that your brazing furnace has a metal muffle and that the dew point in the furnace’s hot zone is maintained below –40°F . It is also critical to keep the oxygen content in the cooling zones below 15 ppm (parts per million) to help avoid oxidation and discoloration of the stainless steel.

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