Welding Gas Mixtures
Shielding Gases for Welding
Among crucial advantages offered by argon-based shielding gas mixtures are excellent depth of weld penetration; greater gap bridging with stronger plate joins producing quality welds; smooth weld surface finish and good mechanical characteristics; minimal splatter; increased welding speeds.
In compliance with ISO 14175-M21, welding mixture produced has the following percentages of gases: 75-95% argon, 5-25% carbon dioxide.
Most popular welding mixtures:
- Gas mixture of 82% argon and 18% carbon dioxide. Suitable for practically all types of materials and used mainly for mechanized manual welding and brazing.
- Gas mixture of 95% argon and 5% carbon dioxide. Provides higher weld density than the 18% CO2 mixture allowing for 10-15 times the welding speeds of carbon dioxide-shielded process. Ideal for automated welding. Spray transfer occurs at lower welding current inputs.
- Gas mixture of 75% argon and 25% carbon dioxide. Used mainly for welding thicker metal plates (filling in preparation V-joints.) The impossibility of achieving spray transfer of metal causes lower welding speeds.
- Gas mixture of 8% carbon dioxide, 2% oxygen, and 90% argon. Oxygen provides a stable arc with low splatter rate, slight strengthening and a flat smooth welded seam profile. The mixture is ideally suited for welding and brazing in forced modes.
- Gas mixture of 18% carbon dioxide, 1% oxygen, and 81% argon. Used for welding a wide range of workpiece cross-sections and widths. The mixture is perfectly suitable for welding thinner sheets preventing burn-throughs and has shown good results for brazing.
Shielding Gases for Consumable Electrode Welding of Structural Steel Alloys
- Gas mixture of 98% argon and 2% carbon dioxide. This mixture affords great looking weld seams finish with smooth profile and no or negligible oxidation of the weld surface. Ideally suited for welding thinner sheets where high path-through speed ensures low rate of metal deformation. Allows for combined welding of stainless steels with ferrous metals.
- Gas mixture of 30% helium, 2% carbon dioxide, and 68% argon. Offers low splatter rate and decreased potential for defective weld seams. Recommended for welding workpieces thicker than 9mm.
Shielding Gas Mixtures for Welding Aluminum and Copper
An array of gases based on mixtures of helium and argon where helium provides a high energy arc, better weld quality and greater productivity. Can be used for welding with both consumable and nonconsumable electrodes.
- Gas mixture of 30% helium and 70% argon. Provides more effective heat transfer compared to argon. Increases weld pool and welding speed. A more even weld surface lowers the welding wire expenditure.
- Gas mixture of 50% helium and 50% argon. Most universally applicable gas mixture. Suitable for welding together workpieces of practically any thickness.
- Gas mixture of 70% helium and 30% argon. High helium content provides a more productive welding arc. Used on thinner workpieces, can significantly lessen porosity, speed up the process, and decrease or entirely eliminate the need for external heating. All gas mixtures mentioned can also be used for consumable electrode welding in impulse mode.
Properly calibrated shielding gases delivery system ensures reliability and efficiency of the welding process by fine-tuning the gas supply and pressure parameters.
Our clients are offered consultations suggesting optimal customized solutions for their particular requirements.
