header
Back to home page Back to Praxair Corporate Site Welding Supplies Specialty Gases and Equipment Back to Cart Praxair Direct Price Quote Button Sign in Register Contact Us Store Locator Home Resource Center

For questions about Praxair products
please call 1-800-PRAXAIR or email us.

Plasma Arc Welding Gases

 

 

Low Current Plasma Arc Welding Shielding Gases

Argon is generally the preferred orifice gas.

Metal Gauge Keyhole Melt-in
Carbon Steel
Carbon Steel  Under 1/16" Keyhole tech, not recommended Argon, Helium, HeliStar A-75
  Over 1/16" ArgonHeliStar A-25 Argon, HeliStar A-25
Stainless Steel
Stainless Steel Under 1/16" Keyhole tech, not recommended Argon, Helium, HydroStar H-2
Stainless Steel Over 1/16" Argon, HeliStar A-25, HydroStar H-5 Argon, Helium, HydroStar H-5
Aluminum
Aluminum Under 1/16" Keyhole tech, not recommended Argon, Helium
Aluminum Over 1/16" Helium Helium
Copper
Copper Under 1/16" Keyhole tech, not recommended Helium, HeliStar A-75
Copper Over 1/16" Helium or HeliStar A-25 Helium

 

High Current Plasma Arc Welding

Gas selections shown are for both the orifice and shielding gas

Metal Gauge Keyhole Melt-in
Carbon Steel
Carbon Steel  Under 1/8" Argon Argon
Carbon Steel  Over 1/8" Argon  HeliStar A-25
Stainless Steel
Stainless Steel Under 1/8" Argon or HydroStar H-5 Argon
Stainless Steel Over 1/8" Argon or HydroStar H-5 HeliStar A-25
Aluminum
Aluminum Under 1/4" Argon Argon, HeliStar A-75
Aluminum Over 1/4" Helium Helium, HeliStar A-25
Copper
Copper Under 3/32" Argon Helium or HeliStar A-25
Copper Over 3/32" Keyhole tech, not recommended * Helium

* The underbead will not form correctly. However, on Cu-Zn alloys a keyhole technique can be used. A65