How to choose welding gas – Coregas brand

How to choose the right welding gas for your application

Many common welding processes such as MIG, TIG and Metal-Core Arc Welding all require an external shielding gas to function correctly.

A shielding gas essentially protects a weld from exposure to nitrogen, oxygen and hydrogen present in the atmosphere.

These elements can react with the weld pool and cause issues such as porosity and excessive spatter.

The Shielding Gas Solutions Guide below offers a basic overview of the welding process, materials and the suitable shielding gases for each application

Material Shielding gas Composition Process Features and Benefits
Carbon steel Coregas 5/2 Ar-CO2-O2  GMAW Up to 8mm. Dip transfer, minimal spatter, good control when positional welding.
Carbon steel Coregas 07 Ar-O2  GMAW Up to 6mm. Minimal spatter, good weld profile, reduced penetration. Smooth running. Not good for out of position. Good for galvanise
Carbon steel Coregas 10 Ar-CO2  GMAW All thicknesses. Good arc transfer, smooth appearance, little spatter. Good for robotic welding.
Carbon steel Coregas 16/3 Ar-CO2-O2  GMAW 12mm and above. Dip and spray transfer, good penetration profile and smooth running.
Carbon steel Coregas 18 Ar-CO2 GMAW–FCAW Heavy section material. Spray transfer. Also FCAW carbon and stainless steel. Improved working environment and easy to set the working point
Carbon steel Coregas 25 Ar-CO2 GMAW–FCAW Heavy section material. Mainly intended for short arc welding with less risk of porosity when plates are dirty, oily or having mill scale. Also spray transfer, FCAW carbon and stainless steel.
Carbon steel Coregas He 30 Ar-HE-CO  GMAW High deposition rates. Good weld profile and penetration. Mainly for automation and good for heavier sections of galvanised material.
Carbon steel Carbon Dioxide CO2 GMAW–FCAW Up to 10mm. Dip transfer only. Increased spatter levels. Also for some FCAW applications.
Carbon steel Argon Ar GTAW All thicknesses.
Stainless steel Shieldpro 20 Ar-CO2  GMAW All thicknesses. Dip and spray transfer, minimal oxidation. Excellent for pulsed MAG. Good penetration and flat weld bead. Improved working environment.
Stainless steel Shieldpro 21 Ar-O2 GMAW Up to 3mm. Dip transfer. Reduced penetration and smooth running.
Stainless steel Shieldpro 22 Ar-H2 GTAW Hydrogen addition gives higher welding speed due to hotter and more constricted arc. 2mm and above. Austenitic stainless steels only. Increased deposition rates. Reduced oxides.
Improved weld profile.
Stainless steel Shieldpro 23 Ar-N2 GTAW The Nitrogen addition reduces Nitrogen loss from the weld metal resulting in better corrosion properties compared to welding with pure Argon.
Mainly for orbital TIG welding. Increased pitting corrosion resistance.
Stainless steel Shieldpro 30 Ar-HE-CO2 GMAW All-round gas for stainless steels and duplex. 3mm and above. Good deposition rates and weld profile. Increased penetration and fluidity of the weld pool.
Higher welding speed compared to gases without Helium.
Stainless steel Shieldpro 31 Ar-HE-CO2 GMAW All thicknesses. Good deposition rates, weld profile and smooth surface appearance.
Stainless steel Shieldpro 32 Ar-HE-CO2 GMAW Over 6mm. Good deposition rates and weld profile.
Stainless steel Shieldpro 33 Ar-HE-O2 GMAW Over 3mm stainless steel and Duplex. Good deposition rates and weld profile. Reduced spatter. good edge wetting.
Stainless steel Argon Ar GTAW All thicknesses. Most commonly used.
Non-ferrous Shieldpro He 25 Ar-HE GMAW–GTAW Over 3mm. Good deposition rates and weld profile.
Non-ferrous Shieldpro He 50 Ar-HE GMAW–GTAW Over 3mm. Good deposition rates and weld profile.
Non-ferrous Shieldpro He 75 Ar-HE GMAW Above 6mm. Good deposition rates and weld profile. Smooth arc characteristics, rotate, clean, smooth surface appearance.
Non-ferrous Argon Ar GMAW–GTAW Below 3mm. Acceptable deposition rates and weld profile.
Copper and alloys Shieldpro He 25 Ar-HE GMAW–GTAW Above 3mm. Good deposition rates and weld profile.
Copper and alloys Argon Ar GMAW–GTAW Below 3mm. Acceptable deposition rates and weld profile.
Nickel and alloys Shieldpro 22 Ar-H2 GTAW 2mm and above. Increased deposition rates. Reduced oxides. Improved weld profile
Nickel and alloys Argon Ar GMAW–GTAW Below 3mm. Acceptable deposition rates and weld profile.

The above recommendations are only a basic guide. For the most accurate recommendation several other aspects must be considered including wire diameter, the setting of parameters and welding position.

If you need to order gas, please order at COREGAS DEPOT – ALL WELDING & ELECTRICAL SUPPLIES

When you need more information, please contact All Welding & Electrical Supplies at email: info@allwelding.com.au or phone number: 1300 255 935.

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