TOKO AWS A5.1 E7018 Low-Hydrogen Welding Electrode
Iron powder, low-hydrogen electrode designed for single- and multi-pass welding of carbon and mild steels. Combines excellent mechanical properties with smooth operability and self-detaching slag.
Key Advantages
- AWS A5.1 / SFA-5.1 compliant — full traceability and certified mechanicals.
- Low-hydrogen (H4) design — diffusible hydrogen ≤4 ml/100g, ideal for restraint joints.
- All-position capability — flat, horizontal, vertical-up, and overhead.
- Iron powder addition — higher deposition rate and easier slag removal.
- Excellent impact toughness — ≥27J at -30°C guarantees performance in cold climates.
- Available diameters: 2.5mm (3/32"), 3.2mm (1/8"), 4.0mm (5/32"), 5.0mm (3/16").
Performance Benefits for Critical Applications
- Arc Stability: Smooth, stable arc with minimal spatter even on AC or DC+.
- Slag Removal: Self-peeling slag in many positions, reducing cleaning time.
- Weld Appearance: Fine ripple, good wetting, and minimal undercut.
- Crack Resistance: Low hydrogen content prevents hydrogen-induced cracking (HIC).
- Versatility: Suitable for thin to thick sections, single or multi-pass.
Primary Industrial Applications
Proven in demanding environments: from seismic zones to arctic infrastructure.
Structural Steel
Beams, columns, bridges, high-rise buildings — X-ray quality welds with high strength.
Shipbuilding
Hull assembly, decks, bulkheads; excellent performance in vertical-up and overhead.
Pressure Vessels
Low-hydrogen characteristic ensures crack-free welds in thick sections and cyclic service.
Heavy Equipment
Excavator arms, crane booms, mining machinery — reliable under high stress.
Additional Applications
- Pipeline repair and fabrication
- Storage tanks and silos
- Railcar manufacturing
- Power plant components
- General structural fabrication
- Offshore modules
Technical Specifications
Chemical Composition (Typical, Weld Metal)
| Element | Value (%) |
|---|---|
| Carbon (C) | 0.05 – 0.10 |
| Manganese (Mn) | 0.90 – 1.40 |
| Silicon (Si) | 0.40 – 0.80 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.015 |
| Nickel (Ni) | ≤ 0.30 |
| Chromium (Cr) | ≤ 0.20 |
| Molybdenum (Mo) | ≤ 0.30 |
Mechanical Properties (As-Welded)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 490 – 590 |
| Yield Strength (MPa) | ≥ 400 |
| Elongation (%) | ≥ 22 |
| Charpy V-notch @ -30°C (J) | ≥ 27 (typical 50-70) |
Welding Parameters (DC+)
| Diameter (mm) | Current (A) | Voltage (V) |
|---|---|---|
| 2.5 | 70 – 110 | 22 – 24 |
| 3.2 | 90 – 140 | 23 – 26 |
| 4.0 | 130 – 190 | 24 – 28 |
| 5.0 | 180 – 250 | 26 – 30 |
AC can also be used but DC+ is recommended for optimal arc stability.
Storage & Re-drying
| Condition | Requirement |
|---|---|
| Unopened packaging | Store in dry place (<50% RH) |
| Opened electrodes | Use within 4 hours or store at 120-150°C |
| Re-drying (if damp) | 300-350°C for 1 hour |
Certifications & Technical Docs
Download batch-specific material certificates, SDS, and welding procedure guidelines.
All certifications are third-party verified and comply with AWS A5.1 / ASME SFA-5.1.