Argon-Oxygen Mixtures -- Praxair's StarGold™ Blends
Argon/oxygen blends are mostly widely used for conventional and pulsed spray transfer on clean (little or no scale or residual oil), plain carbon and stainless steel. These blends, typically 1, 2 or 5% oxygen, provide good arc stability and very low levels of spatter and fume. Higher levels of oxygen will also increase puddle fluidity that may make out-of-position welding more difficult.
Principal Applications
Generally used for welding heavy section carbon steel for farm equipment, military transports, ships and automotive assemblies. These blends are also used for spray arc welding of both ferritic and austenitic stainless steel components.
StarGold O-1 Gas Blend
This blend is primarily used for spray transfer on stainless steels. One percent oxygen is usually sufficient to stabilize the arc and improve the droplet rate and bead appearance.
StarGold O-2 Gas Blend
This blend is used for spray arc welding of carbon steels, low-alloy steels and stainless steels. It provides greater wetting action than the 1% oxygen mixture. Weld mechanical properties and corrosion resistance of welds made with 1% and 2% oxygen additions are similar. However, bead appearance will be darker and more oxidized for the 2% blends with stainless steels.
StarGold O-5 Gas Blend
This blend provides a more fluid but controllable weld pool. It is the most commonly used argon-oxygen mixture for general carbon steel welding. The additional oxygen also permits higher travel speeds.
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Blends for GMAW
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O-1 Blend for all
forms of GMAW of stainless steel
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