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The Praxair HydroStar® shielding gas blends are primarily used for joining austenitic stainless steels utilizing the Gas Tungsten Arc Welding (GTAW or TIG) process. Hydrogen increases heat input to the base materials while providing a reducing atmosphere to enhance weld cleanliness. Significant advantages in travel speed over pure argon can be attained.

Principal Applications
Additions of 2-5% are generally used for manual TIG welding of stainless steel food service equipment, railings, and aerospace components. Hydrogen additions of 10-15% are generally used in the mechanized welding of austenitic stainless steel tubing.


Mixture Composition % Cylinder Style Volume (ft3) Pressure (psig) Part Number More Information
Ar
H2
HydroStar® H-2 98 2 T
K

300
223

2,400
2,000
AR STAR43-T
AR STAR43-K

HydroStar Brochure

HydroStar® H-5 95 5 T
K
297
221
2,400
2,000
AR STAR5-T
AR STAR5-K

HydroStar Brochure

HydroStar H-5 Datasheet

HydroStar® H-10 90 10 T
K
293
218
2,400
2,000
AR STAR57-T
AR STAR57-K
HydroStar Brochure
HydroStar® H-35 65 35 T
K
276
207
2,400
2,000
AR STAR56-T
AR STAR56-K
HydroStar Brochure

Warning: Special safety precautions are required when mixing argon and hydrogen. Do NOT attempt to mix argon and hydrogen from separate cylinders.

Note: Oxygen and carbon dioxide are chemically reactive and should not be used with GTAW. Their oxidation potential can cause severe erosion and degradation of the tungsten electrode at arc temperatures.

HydroStar H-2 and H-5 Gas Blends

These blends are used for manual welding applications. The HydroStar H-5 blend is preferred on material thicknesses above 1/16 inch. These blends are also suitable for use with GTAW when welding 300 series austenitic stainless steels and as a back purge gas on stainless steel materials.

HydroStar H-10 Gas Blend

This blend is preferred for high-speed GTAW mechanized applications on austenitic stainless steel.

HydroStar H-15 Gas Blend

This blend, which contains 15% hydrogen, is used most often for welding butt joints in stainless steel at speeds comparable to helium, and 50 percent faster than argon. The HydroStar H-15 blend is also used to increase the speed of welding 300 series stainless steel. It can be used on all thicknesses of stainless steel. Concentrations greater than 15% may cause weld metal porosity, with multi-pass applications.

HydroStar H-35 Gas Blend

It is recommended as the plasma gas with plasma arc gauging, when cutting aluminum and stainless steel and when cut quality and face appearance are critical.