What is 95/5 Argon/Oxygen gas used for???

[Brian Ski]

I ran across someone selling a cylinder of 95/5 gas. I thought you need to keep oxygen away from your welds???

[CGCINC]

I can answer that!!
I just asked a similar question. Mig welders use mixed gas when welding.
Oxygen is normally added to argon in amounts of 1%, 2%, or 5%. When oxygen is added to argon, it improves the penetration pattern. It also improves the bead contour and eliminates the undercut at the edge of the weld. You use argon-oxygen mixtures in welding alloy steels, carbon steels, and stainless steel


There are many different combinations and they are all used for welding different materials.

http://www.everlastgenerators.com/fo...al-world-input


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[sportbike]

Oxygen additions can also be added in to make the gas active and actualy strengthen the weld due to intentional oxide formation.