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Copper heat exchanger


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. ​
Download Atmosphere Solutions for Metals Processing brochure
Aluminum heat exchanger manufactured using a brazing process

Industrial Gases from a Global Leader

  • Global leading manufacturer of nitrogen, oxygen, and argon
  • World leading producer and supplier of hydrogen and helium
  • Reliable supply of industrial gases
  • Excellent record of meeting on-time needs
  • Industry leader in safety
  • Technical support when you need it
  • World-class customer service

Heating Treating Solutions

Air Products offers a wide range of technologies, gases, equipment, and cutting edge solutions for the heat treating industry.

Brazing Expertise and Solutions

Tailor atmosphere composition to optimize part strength and integrity.

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

Stringent atmosphere control

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

Improve mechanical strength and surface quality

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

Optimize braze wettability

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

Clean brazing surfaces

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

Prevent decarburization

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

Put our world-class experience to work for you.

Get in touch with one of our technical experts for help designing, engineering, constructing and operating a gas supply system for your specific application.

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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.
Girl with helmet in a plant

Each Atmosphere Solution is Customized for Your Needs

We can help you choose the right atmosphere composition.

  • Select and provide blending and flow control equipment
  • Perform on-site atmosphere analyses for consistent dimensional control, carbon control, and physical and metallurgical properties
  • Optimize your furnace process to lower operating costs
  • Perform state-of-the-art metallographic and chemical analyses (SEM, ESCA, SAM, ISS, SIMS)
  • Provide safety training
  • Test atmospheres using your parts in our lab furnaces
  • Demonstrate our system at your facility
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Air Products technical expert in discussion with a customer

Industrial Gas Audits and Leak Detection Services

Audits and leak detection services can be comprehensive assessments of the entire gas supply system, or specific to gas or process equipment that use the gas.
Additional services


Air Products gases, typically provided in gaseous and liquid form, enable customers in a wide range of industries to improve their environmental performance, product quality, and productivity.


Valued for its reactive and protective properties, and used by many industries such as electronics, foods, glass, chemicals, refining and more can benefit from its unique properties to improve quality, optimize performance and reduce costs.


Useful as a gas, for its inert properties, and as a liquid for cooling and freezing. Virtually any industry can benefit from its unique properties to improve yields, optimize performance and make operations safer.