95% Ar - 5% Hydrogen vs 100 Argon cleaner??

[Capntom]

Is the 95-5 a cleaner shielding gas as well as an aid to penetration?? I am welding 300 series SS to each other. GTAW, .060 wall. Where can I find onfo that educates me on these variables??

 

[metengr]

A good source of information regarding shielding gases for the GTAW process is from the PRAXAIR web site. I included the address below;

http://www.praxair.com/praxair.nsf/...b09d9336e459a16285256561007b0c29?OpenDocument

 

[boo1]

Hydrogen is flameable and not acceptable as a shielding gas.

 

[andyenergy]

boo1 - Yes hydrogen is flammable. It is acceptable as part of a mix with argon for austenitic materials. Definitley not acceptable on its own, or in any quanitity when used with ferritic materials.

Good link from metengr

 

[boo1]

We use Argon and Helium gass mixtures

 

[EdStainless]

As torch gas or sheild gas?
We use 95/5 in plasma torches. It is hard to use as a shield gas becuase is has better thermal conductivity and my reduce penetration, but yes, it is cleaner.
5% H2 is not a saftey issue. You are below the flamability limits, and by the time you add enough air to have some O2 you are even lower.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.

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