Low Alloy & High Strength
E12018-G 120 ksi High Strength Low Alloy Welding Electrode
E12018-G is a 120 ksi high-strength low-hydrogen welding electrode for SMAW. It is designed for demanding high-strength and low-alloy steels where higher weld-metal strength is required. As a G-type AWS classification, E12018-G does not define one universal weld-metal chemistry. Actual composition, toughness and performance should be confirmed from the product TDS and MTC.
E12018-G for S690 and Q&T Steel
A 120 ksi electrode may be considered when weld-metal strength needs to closely match ultra-high-strength base materials.
Depending on the qualified product, applications may include:
- S690, S690Q and S690QL-class steels
- Q&T and fine-grained high-strength steels
- Heavy machinery and lifting equipment
- Cranes and high-strength structures
- Penstocks and hydraulic equipment
- Heavy industrial fabrication
The exact base-metal compatibility should be confirmed from the manufacturer's TDS and qualified WPS.
AWS Mechanical Requirements
AWS A5.5/A5.5M E12018-G is classified at the 120 ksi tensile-strength level.
Property | AWS Minimum |
|---|---|
Tensile Strength | ≥830 MPa (120 ksi) |
Yield Strength | ≥740 MPa (107 ksi) |
Elongation | ≥14% |
These are AWS classification minimums, not typical commercial values. Specific products may provide higher strength or additional Charpy impact performance. Project-specific toughness requirements should be confirmed from the product certification.
E12018-G Chemistry
The G designation does not specify one complete universal weld-metal chemistry. Commercial E12018-G electrodes may use combinations of Mn, Ni, Cr and Mo to achieve the required strength, toughness and weldability.
When approving or replacing an E12018-G electrode, compare:
- Weld-metal chemistry
- Tensile and yield strength
- Charpy impact results
- Hydrogen designation
- Base-metal compatibility
- WPS requirements
- MTC and certification
Welding and Low-Hydrogen Control
E12018-G is generally supplied as a basic low-hydrogen covered electrode for SMAW. Common commercial diameters include 2.5, 3.2, 4.0 and 5.0 mm.
Welding current, polarity, preheat and interpass temperature vary by product, diameter and welding position. The manufacturer's TDS and qualified WPS should therefore be used as the primary reference.
Low-hydrogen electrodes should be stored and redried according to the manufacturer's instructions.
E12018-G vs E11018-G
| E11018-G | E12018-G |
|---|---|---|
Tensile class | 110 ksi | 120 ksi |
Minimum tensile strength | 760 MPa | 830 MPa |
Minimum yield strength | 670 MPa | 740 MPa |
Main selection | Very high strength | Ultra-high strength |
Choose E12018-G when the project requires 120 ksi-class weld-metal strength and its toughness, chemistry and welding procedure are compatible with the base material.
Classification and Supply
AWS: A5.5/A5.5M E12018-G
ASME: SFA-5.5 E12018-G, when certified
Process: SMAW
Electrode Type: Low-hydrogen covered electrode
Strength Level: 120 ksi
Typical Sizes: 2.5, 3.2, 4.0 and 5.0 mm
GD WELD supplies E12018-G high-strength low-alloy welding electrodes for international industrial procurement. Product chemistry, mechanical properties, impact performance, sizes and certification can be confirmed according to project requirements.
Tags
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Internal Links
👉 Internal Link 1: Anchor text: E11018-G 110 ksi high strength welding electrode Link to: E11018-G High Strength Low Alloy Welding Electrode
👉 Internal Link 2: Anchor text: E10018-G 100 ksi high strength welding electrode Link to: E10018-G High Strength Low Alloy Welding Electrode