MIXTURE GASES

  • Home
  • Industrial
  • Mixture Gases

Welding Gas Mixtures

Green ASU is also dealing with the special gas mixture needs of our customers. Some of the major types of gas mixtures are as follows:

Argon COâ‚‚ Mixtures:

Argon/carbon dioxide blends are versatile mixtures for welding Carbon, Low-Alloy and some Stainless Steels. Increasing the COâ‚‚ content will increase weld penetration and bead wetting characteristics. At higher current levels and COâ‚‚ content, increased spatter may result. Ar/COâ‚‚ blends can be used to join a wide range of material thickness while utilizing a variety of modes of metal transfer. Ar/COâ‚‚ blends are used for all kinds of structural steel, farm implements and machinery. Lower levels of COâ‚‚ can be used for the pulsed arc or spray arc welding, while higher levels > 20% are used for short arc welding and the shielding of some flux-cored wires.

Some of the commonly used ratios are as follows:

ARGON 95% - 5% COâ‚‚

used for pulsed spray transfer and short-circuiting transfer on a variety of material thicknesses.

ARGON 90% - 10% COâ‚‚

For spray transferring mild steel.

ARGON 85% - 15% COâ‚‚

used for variety of applications on Carbon and Low-Alloy Steels

ARGON 80% - 20% COâ‚‚

used for short circuiting or spray transfer welding of Carbon Steel.

ARGON 75% - 25% COâ‚‚

for short circuiting low carbon steel.

Argon Oxygen Mixtures:

Argon/oxygen blends are most 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. 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.

ARGON 95% - 5% OXYGEN

provides a more fluid but controllable weld pool, most commonly used the argon-oxygen mixture for general Carbon Steel welding.

ARGON 99% - 1% OXYGEN

used for spray transfer on Stainless Steels.

ARGON 98% - 2% OXYGEN

for spray transferring stainless steel.

Other gas mixtures:

TRI-MIX - 90% Helium - 7.5% Argon - 2.5% COâ‚‚ "GREAT CHOICE FOR SHORT-CIRCUITING STAINLESS STEEL

This tri-mix blend is widely used for short-circuiting transfer welding of Stainless Steel in all welding positions. The carbon dioxide content is kept low to minimize carbon absorption and assure good corrosion resistance, especially in multipass welds. The argon and carbon dioxide additions provide good arc stability and depth of fusion. The high helium content provides significant heat input to overcome the sluggish nature of the stainless steel weld pool.

TRI-MIX 66% Argon 26.5% Helium 7.5% COâ‚‚

This tri-mix blend has been developed for spray and pulsed spray arc welding of both Carbon and Low-Alloy Steels. It can be used on all thicknesses in any position. This high-speed blend will produce higher quality welds over rust, oil, and mill scale than conventional two-part mixtures. It produces good mechanical properties and weld puddle control.

TRI-MIX 66.1% Argon 33% Helium 0.9% COâ‚‚

This tri-mix blend is used for a short arc, spray, and pulsed spray arc welding of Stainless Steel. It provides a higher welding speed, a broad weld with a flat crown and good color match, reduced porosity, and excellent alloy retention with good corrosion resistance.

Argon Nitrogen Mixtures:

Argon/nitrogen mixture is an inert gas that offers several advantages when used as a welding gas. Argon and Nitrogen are fully inert gases, therefore they do not affect the weld metallurgy as there is no reaction taking place. When used as a mixture, Nitrogen acts as the backing gas.

Argon Hydrogen Mixtures:

The addition of hydrogen to the argon shielding gas alters the bead geometry as follows. The penetration of the weld is increased, while the width remains almost unaffected. This results in an increase in weld depth-to-width ratio. Furthermore the weld cross sectional area is increased due to the increased heat input.