Description
NIHONWELD N-7018-1 is a high-performance iron powder extra-low hydrogen covered electrode developed for all-position welding of 400–490 kgf/mm² high tensile steels used in low-temperature applications. Engineered for structural fabrication and demanding industrial welding environments, it provides reliable weld integrity, stable arc characteristics, and excellent mechanical performance.
The electrode delivers excellent notch toughness at low temperatures, making it suitable for critical welding applications where impact resistance and weld durability are essential. Its smooth welding operation and dependable usability help improve productivity and weld quality in fabrication, maintenance, repair, and heavy industrial work.
NIHONWELD N-7018-1 produces strong weld deposits with excellent toughness and crack resistance, making it suitable for structural steel fabrication, pressure vessels, offshore structures, and low-temperature service applications.
Key Features
- Iron powder extra-low hydrogen electrode
- Excellent low-temperature notch toughness
- Stable arc and smooth welding operation
- Suitable for all-position welding
- Reliable weld quality and crack resistance
- Ideal for high tensile steel applications
Classification
- AWS A5.1 E7018-1 H4R
Typical Chemical Composition of Weld Metal Deposits (%)
| C | Si | Mn | P | S |
|---|---|---|---|---|
| 0.08 | 0.18 | 0.45 | 0.014 | 0.005 |
Typical Mechanical Properties of Weld Metal Deposits
| Property | Value |
|---|---|
| Yield Point | 540 N/mm² (78 KSI) |
| Tensile Strength | 600 N/mm² (87 KSI) |
| Elongation | 30% |
| Impact Value | -46°C, 115 J (-51°F, 85 Ft-Lbs) |
Size and Recommended Current Range (AC / DC+)
| Diameter | Length | Flat | Vertical & Overhead |
|---|---|---|---|
| 2.5 mm | 350 mm | 55–85A | 50–80A |
| 3.2 mm | 350 mm | 90–120A | 80–110A |
| 4.0 mm | 400 mm | 120–170A | 100–160A |
| 5.0 mm | 450 mm | 170–200A | 140–190A |
Welding Positions
All Positions
Approvals
ABS
Applications
- High tensile steel welding
- Low-temperature structural applications
- Pressure vessel fabrication
- Offshore and industrial structures
- Maintenance and repair work
- Heavy-duty industrial welding
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