Welding Oxygen. Never use oxygen supplies to sweeten the air this is a very serious fire risk Welding gases such as argon carbon dioxide nitrogen and helium can displace the air inside enclosed spaces. Gas Cylinders Volume Of Welding.
I just Googled a good resource. A global leader in industrial welding and specialty gases we at Praxair believe the right gas can help you do more than run an application. Stainless steel and some other metals are sensitive to the presence oxygen during TIG welding.
Oxygen is commonly and traditionally used with a fuel gas acetylene propane or propylene for cutting welding brazing and soldering.
I just Googled a good resource. Welding oxygen does not carry this particular human grade certification. After reading this article you will learn about the use of oxygen in welding science. If you get the certification with welding grade then it is the same.