The SUPERON Super Optimal E7018 is a premium, low-hydrogen, iron-powder coated electrode for shielded metal arc welding (SMAW) of carbon and low-alloy steels in critical applications. It is renowned for producing high-strength, crack-free welds with excellent impact toughness, even at low temperatures.

Key Specifications & Properties

AWS Classification: AWS A5.1 Class E7018 (variants like E7018-1 H4R also available).
Coating Type: Basic heavy coating with iron powder for high recovery and low hydrogen content (typically <4 ml/100g weld metal).
Tensile Strength: Minimum 70,000 psi (around 510-650 N/mm², depending on the specific variant).
Welding Positions: Suitable for all-position welding (flat, horizontal, vertical-up, overhead).
Current Type: Can be used with both AC and DC+ (DCEP - Direct Current Electrode Positive) current.
Slag Release: Features a unique self-lifting slag that minimizes cleanup time and enhances productivity.
Toughness: Delivers excellent impact notch toughness, maintaining properties down to temperatures as low as -50°C (-58°F).

Performance & Applications

Weld Quality: Guarantees X-ray quality, crack-free, and highly reliable weldments, especially in high-stress environments.
Arc Stability: Provides a stable and controlled arc with minimal spatter and smooth bead appearance.
Applications: Ideal for critical and demanding welding applications in various industries:
- Structural fabrication (bridges, buildings, marine and offshore structures).
- Pressure vessels, boilers, and storage tanks.
- Heavy machinery manufacturing (cranes, excavators, earthmoving equipment).
- Piping and pipelines (including creep-resistant steels for high-temperature service with variants like E7018-A1).

Handling & Storage

Moisture Control: As a low-hydrogen electrode, proper storage is critical to prevent moisture absorption and hydrogen-induced cracking.
Storage: Should be stored in an airtight container or a heated electrode oven maintained at approximately 120°C to 150°C (250°F to 300°F) after the original hermetically sealed packaging is opened.
Re-baking: If exposed to moisture, they may require re-baking at a high temperature (e.g., 370°C–425°C) to restore low-hydrogen properties, following manufacturer guidelines.

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