TOKO AWS A5.4 E347-16 Welding Electrode
TOKO E347-16 is a niobium-stabilized, lime-type, all-position stainless steel electrode designed for welding stabilized austenitic stainless steels (grades 321, 347, 348) and for applications requiring resistance to intergranular corrosion at elevated temperatures.
Key Advantages
- AWS A5.4 Compliance: Certified E347-16 stainless steel electrode for critical applications.
- Niobium Stabilization: Prevents sensitization and intergranular corrosion in high-temperature service.
- High-Temperature Resistance: Maintains mechanical properties and corrosion resistance up to 800°C (1470°F).
- All-Position Capability: Excellent operability in all welding positions with smooth arc and minimal spatter.
- Weld Metal Integrity: Produces sound, crack-resistant welds with excellent ductility and toughness.
Classification & Specification
- AWS Classification: Compliant with AWS A5.4 E347-16 standards.
- Material Compatibility: Stabilized austenitic stainless steels (321, 347, 348), 18-8 type stainless steels, and dissimilar joints.
- Specialty: Designed for service in corrosive environments and elevated temperatures up to 800°C.
Common Applications
- Chemical and petrochemical processing equipment
- Heat exchangers and furnace components
- High-temperature piping systems
- Power generation and nuclear industry components
- Aerospace and aviation structures
- Food processing and pharmaceutical equipment
- Cladding and overlay for corrosion protection
Technical Specifications
Chemical Composition (Typical Weld Metal)
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 18.0 – 21.0 |
| Nickel (Ni) | 9.0 – 11.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | 0.5 – 2.5 |
| Silicon (Si) | ≤ 1.0 |
| Niobium (Nb) | 8×C – 1.00 (stabilizing element) |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 590 MPa (85 ksi) |
| Elongation | ≥ 30% (in 50 mm) |
| Corrosion Resistance | Excellent resistance to intergranular corrosion (stabilized against sensitization) |
| Magnetic Properties | Non-magnetic (austenitic structure) |
Operating Characteristics
- Polarity: AC or DC+ (direct current electrode positive).
- Preheat/Interpass Temperature: Generally ≤ 150°C (300°F) to minimize distortion and hot cracking.
- Post-Weld Treatment: Stress relief annealing at 600–650°C may be applied for critical applications.
- Storage: Keep in dry conditions; re-dry at 250–300°C for 1–2 hours if moisture pickup occurs.
TOKO-Specific Features
- Arc Stability: TOKO E347-16 delivers a smooth, stable arc with minimal spatter, ideal for precision welding.
- Slag Detachability: Easy slag removal saves time and improves weld surface quality.
- Niobium Stabilization: Ensures resistance to intergranular attack even after prolonged exposure to elevated temperatures.
- Certifications: Meets international standards including ISO, EN, and ASME for critical service.
⚠️ Important: E347-16 is the preferred choice for welding types 321, 347, and 348 stainless steels where niobium stabilization is required to prevent chromium carbide precipitation and maintain corrosion resistance at high temperatures.
Technical Documentation
✅ For specific welding parameters and procedure qualifications, refer to TOKO's technical datasheets and WPS (Welding Procedure Specification).