The best shielding gas blend for welding stainlesssteel frequently depends upon the desired beadshape, color and chemistry, and on the type of metaltransfer used.
Two-part blends, either argon/oxygen or argon/carbon dioxide, provide good performance andreduced shielding gas costs.
Praxair’s StarGold O-1 gas blend is primarily usedfor pulsed and spray metal transfer where a slightlyoxidized weld bead surface is acceptable. Oxygenstabilizes the arc and improves metal transfer withouta significant change in bead appearance.
Oxygen blends with greater than 5% oxygen exhibit greater tendency toward undercutting, poor bead shape and difficulty in puddle control. Gap-bridging ability is reduced. Oxide build up on the bead surface may also be excessive, which can be problematic when the weldment is painted.
The StarGold argon/oxygen blends from Praxair can be readily supplied as pre-mixed liquid in portable containers for reduced gas supply costs.
Minimum oxidizing potential
Spray welding thick sections of stainless steel
Below are comparisons between shielding gas blends over a range of operating conditions. They are intended to provide suggestions for gas blend selection based on the criteria indicated.
Note: The selection of the appropriate shielding gas can be complex due to the variety of operating variables (base metal chemistry and thickness, transfer type, wire selection and welding position). Consult your Praxair representative to help you choose the best gas for your application.
|Wire Diameter (in)||Process||Wire Feed Speed (ipm)||Current Level (amps)||Voltage (volts)*|
* Voltage level for 60 Hz power supply. Add 2-3 volts for 50 Hz models.