ESAB OK 74.78 VP Low Alloy Electrode
ESAB OK 74.78 VP is a premium low-hydrogen electrode, for the welding of high-tensile steels, particularly in low-temperature environments. Classified as E9018-D1 under AWS standards, it delivers excellent mechanical properties and outstanding notch toughness. In addition, its impact values are as high as 90 J at -40°C. This electrode is ideal for applications requiring high strength and toughness, such as enclosed welding, rail welding, and cladding where hardness up to 250 HV is needed.
The VacPac™ packaging ensures that the electrodes remain moisture-free, eliminating the need for re-baking and delivering consistent weld quality. ESAB OK 74.78 VP is suitable for both AC and DC welding, and its low moisture content makes it effective even when preheating is not possible, enhancing its usability in challenging environments.
Key Features of ESAB OK 74.78 VP
- AWS Classification E9018-D1: Low-hydrogen electrode for high-tensile steel welding in low-temperature conditions.
- Notch Toughness: Provides superior impact toughness down to -40°C, with values of 90 J at -40°C and 70 J at -50°C.
- Low Moisture Coating: Allows welding without preheating, making it suitable for environments with limited preparation.
- Versatile Application: Ideal for rail welding, cladding, and high-tensile structural components with a hardness of ~250 HV.
- VacPac™ Packaging: Ensures moisture-free storage, improving weld quality and reducing the risk of hydrogen-induced cracking.
Applications
- Rail Welding: Suitable for butt welding of rails with tensile strength between 800-900 N/mm² and cladding applications.
- High-Tensile Steel Structures: Ideal for welding in high-strength, low-temperature environments, including construction and industrial fabrication.
- Low-Temperature Applications: Performs reliably in cold environments, ensuring tough, crack-resistant welds even at -40°C.
- Maintenance and Repair: Effective for enclosed welding and critical repairs where preheating cannot be applied.
Specifications
| Feature | Details |
|---|---|
| AWS Classification | E9018-D1 |
| Alloy Type | Low alloyed (0.4% Mo) |
| Yield Strength | 600 MPa |
| Tensile Strength | 650 MPa |
| Elongation | 24% |
| Impact Toughness (at -40°C) | 90 J |
| Coating Type | Basic |
| Welding Current | AC/DC+ |
For tough, high-tensile steel welding in low-temperature applications, choose ESAB OK 74.78 VP. Its low-hydrogen design, excellent impact toughness, and versatility make it essential for welding in challenging environments such as rail systems, structural components, and industrial repairs.
Reference: manufacturer’s page.
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