AO2 Stainless Steel MIG Welding Gas, 300 cu/ft (Cylinder Size T, 50)

Product Overview

Our 98/2 Argon/Oxygen Stianless MIX A AO2 Shielding Gas Blend is a high-purity, specialty mix engineered specifically for high-efficiency MIG (GMAW) welding of stainless steels. By combining 98% pure Argon with a precise 2% addition of Oxygen, this gas mixture overcomes the sluggish arc characteristics of pure argon without causing excessive surface oxidation.

Designed primarily for spray-transfer and pulsed-spray MIG welding, this blend improves arc stability and dramatically lowers liquid metal surface tension. This allows molten stainless steel droplets to flow smoothly and wash neatly into the joint toes, producing clean, flat, high-strength welds with minimal post-weld discoloration.

Key Features & Benefits

• Enhanced Weld Pool Fluidity: The 2% oxygen addition acts as an arc stabilizer, reducing liquid surface tension so the weld pool washes smoothly into sidewalls without undercutting.

• Preserves Corrosion Resistance: Low oxygen levels keep oxide scale to an absolute minimum, protecting the underlying chromium content and reducing acid-pickling and wire-brushing cleanup.

• Optimized for Spray & Pulsed Transfer: Enables smooth, low-spatter spray transfer at lower voltage thresholds, keeping heat input manageable on thin-to-medium plate.

• Superior Bead Profile: Produces flat, smooth weld faces with fine tie-in, avoiding the steep, high-crown beads typically seen when MIG welding stainless with improper gas mixes.

Primary Welding Applications

Note: Not recommended for short-circuit MIG transfer on thin stainless sheet metal (use a Helium Tri-Mix like 90% He / 7.5% Ar / 2.5% $\text{CO}_2$ instead to prevent burn-through).

Technical Specifications

• Composition: 98% Argon ($\text{Ar}$), 2% Oxygen ($\text{O}_2$)

• Classification: AWS A5.32 / ISO 14175-M13

• Cylinder Valve Outlet: CGA 580 (Standard for Inert/Mix Gases)

• Recommended Transfer Mode: Spray Transfer, Pulsed-Spray Transfer

• Gas Density: $1.78\text{ kg/m}^3$ (heavier than air, providing excellent weld pool coverage)

TDG Shipping & Logistic Profile (Canada)

• TDG Shipping Name: COMPRESSED GAS, N.O.S. (Argon, Oxygen)
• UN Number: UN1956
• Primary Class: 2.2 (Non-flammable, non-toxic gas)
• Hazard Class: CA-2.2 (Non-flammable, non-toxic gas)
• Typical Cylinder Fill Pressure: 2,015 to 2,265 psi at 21DegC
• Gas Density: Heavier than air (ensures excellent shielding coverage over the weld pool)
• Cylinder Size: Large, T, 50L 300CF
  
• Cylinder Height: 1409mm / 55.5" (Approx.)
• Cylinder Width: 228.6mm / 9" (Approx.)
• Cylinder Tare Weight: 60.8kg / 134 lb (Approx.)
• Cylinder Valve Outlet: CGA 580 (Standard for Inert/Mix Gases)

⚠️ Safety & Handling Information

• Storage: Secure cylinders upright in a cool, dry, well-ventilated area away from high traffic and heat sources.

• Ventilation: High-voltage spray welding on stainless steel generates chromium oxides in weld fumes. Always utilize local exhaust ventilation or a personal respirator system.

• Asphyxiant Hazard: Argon-based mixtures displace oxygen in low or enclosed spaces. Ensure adequate room air exchange during operation.