CRONIGON® 2 is specifically formulated for MAG welding of austenitic stainless steels, providing minimal oxidation with its precision 98% Ar + 2% CO2 mixture, ensuring excellent corrosion resistance and superior metallurgical properties in the final weld.
Stainless Steel Specialist
CRONIGON® 2
Ar + 2% CO₂The premium choice for stainless steel MAG welding, engineered to preserve corrosion resistance while delivering the productivity advantages of MAG over TIG welding processes.
Technical Specifications
| Property | Value | Benefit |
|---|---|---|
| Argon Content | 98% | Minimal oxidation, stable arc |
| CO₂ Content | 2% | Enhanced penetration and wetting |
| Density (15°C) | 1.65 kg/m³ | Efficient gas coverage |
| ISO 14175 Classification | M12-ArC-2 | International standard compliance |
| Dew Point | ≤ -65°C | Ultra-low moisture content |
| Oxygen Content | ≤ 2 ppm | Prevents porosity and oxidation |
Applications & Use Cases
Primary Applications
- MAG welding of 300 series austenitic stainless steels (304, 316, 321)
- Food industry equipment and vessels
- Chemical processing equipment
- Pharmaceutical manufacturing equipment
- Architectural and decorative stainless applications
- Marine and offshore stainless structures
Material Compatibility
Welding Positions
- Flat (1G/PA) - Optimal for automated and robotic applications
- Horizontal (2G/PB) - Excellent for fillet welds in structures
- Vertical (3G/PF) - Superior sidewall fusion with minimal heat tint
- Overhead (4G/PE) - Stable arc characteristics for difficult positions
Advantages & Performance
Metallurgical Benefits
- Preserves corrosion resistance with minimal chromium oxidation
- Maintains austenitic structure without harmful carbide precipitation
- Excellent pitting resistance equivalent to base material PREN values
- Superior impact toughness down to -196°C (liquid nitrogen service)
- Low ferrite number (FN 3-8) for optimal ductility
Weld Quality Benefits
- Minimal heat tint and discoloration for cosmetic applications
- Reduced spatter compared to higher CO2 mixtures
- Excellent wetting and bead profile for single-pass applications
- Low hydrogen content prevents delayed cracking
- Consistent penetration without excessive dilution
Productivity Advantages
- 3-5x faster deposition rates compared to TIG welding
- Suitable for mechanized and robotic welding systems
- Minimal post-weld cleaning and passivation required
- Extended contact tip life due to stable arc characteristics
- Reduced need for backing gas in many applications
Usage Guidelines
Recommended Parameters
| Material Thickness | Gas Flow Rate | Nozzle Distance | Special Notes |
|---|---|---|---|
| 1-3mm | 10-12 L/min | 8-12mm | Pulse welding recommended |
| 3-6mm | 12-15 L/min | 10-15mm | Short-circuit or pulse transfer |
| 6-12mm | 15-18 L/min | 12-18mm | Consider backing gas for root passes |
| 12mm+ | 18-22 L/min | 15-20mm | Multi-pass with interpass cleaning |
Setup Instructions
- Ensure extremely clean gas lines - any contamination affects corrosion resistance
- Use dedicated stainless steel regulators to prevent cross-contamination
- Set flow rate and purge system thoroughly before welding
- Use stainless steel wire with matching alloy composition
- Maintain consistent 10-15° push angle for optimal coverage
- Keep stick-out to 8-12mm to minimize atmospheric contamination
Optimization Tips
- Consider CRONIGON 2He55 for superior low-temperature toughness
- Use trailing shields for critical aerospace and nuclear applications
- Increase flow rates by 20% for outdoor welding to combat wind
- Pre-flow 3-5 seconds to ensure complete air displacement
- Post-flow 5-10 seconds for complete protection during cooling
- Consider argon backing for full penetration joints
Limitations & Considerations
Not Recommended For
- Carbon or low-alloy steels (use CORGON series instead)
- Aluminum alloys (use VARIGON series instead)
- Ferritic stainless steels requiring higher heat input
- Super duplex steels (use CRONIGON He30C instead)
- Applications where maximum penetration is critical
Special Considerations
- Higher cost than carbon steel mixtures - optimize parameters to maximize efficiency
- Requires stricter cleanliness standards than carbon steel welding
- May require interpass cleaning for multi-pass applications
- Heat input control critical to prevent sensitization in 300 series
- Consider L-grade (low carbon) base materials for critical applications
Comparison with Alternatives
CRONIGON 2 vs Pure Argon (TIG Alternative)
Pure Argon (TIG)
When to use TIG with pure argon: Ultra-high quality applications, thin materials below 1mm, situations requiring precise heat control and minimal dilution.
CRONIGON 2 advantage: 3-5x faster welding speeds, suitable for automation, lower skilled labor requirements, and reduced cost per inch of weld. Maintains 95% of TIG quality at significantly higher productivity.
CRONIGON 2 vs Generic Ar/CO2 Mixes
| Feature | CRONIGON® 2 | Generic Mix | Advantage |
|---|---|---|---|
| CO2 Precision | 2.0% ±0.1% | 2.0% ±0.5% | Consistent corrosion resistance |
| Purity Level | 99.998% | 99.95% | Ultra-low contamination risk |
| Moisture Content | ≤1 ppm | ≤10 ppm | Prevents porosity and hydrogen pickup |
| Quality Assurance | Certificate with every batch | Periodic testing | Traceability and compliance assurance |
Related Linde Products
CRONIGON® 2He55
Enhanced low-temperature toughness
CRONIGON® He30C
For super duplex stainless steels
FORMIER®
Root protection and purging gas
CORGON® 18
For carbon steel applications
Technical Support & Availability
Linde Technical Support
Specialized stainless steel welding support including welding procedure specifications (WPS), procedure qualification records (PQR), and corrosion testing assistance. Our materials engineers provide guidance on alloy selection and post-weld treatment requirements.
Product Availability
- High-pressure cylinders: 10L, 20L, 50L with premium valves
- Dewars and liquid supply for high-volume operations
- Custom purity grades for nuclear and aerospace applications
- Temperature-controlled storage and delivery systems
- Comprehensive certificates of analysis with each shipment
Ordering Information
Product code: CRONIGON-2-XX. Minimum orders may apply for specialty grades. Advanced ordering recommended for mission-critical applications requiring specific lot control.