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Description: a low-hydrogen sodium-type coated low-alloy steel electrode. It is suitable for DC reverse polarity (DC+) welding and can be used for all-position welding.
Application
Used for welding low-alloy steel structures with matching tensile strength, such as 14MnMoVB, WEL-TEN70, and Japanese HW56 steels.
Chemical Composition of deposited metal (Mass Fraction,%)
| C | Mn | S | P | Si | Ni | Cr | Mo | |
| Standard Value | >=1.0 | >=1.50 | >=0.30 | >=0.20 | ||||
| Example | 0.067 | 1.45 | 0.010 | 0.020 | 0.34 | 1.70 | 0.50 | 0.30 |
Mechanical Properties of Deposited Metal (After 620 ± 15°C × 1h Post-Weld Heat Treatment)
| Tensile Strength  (MPa) | Yield Strength  or  (MPa) | Elongation After Fracture  (%) | -40°C Impact Energy  (J) | |||
| Standard Value | ≥ 690 | ≥ 590 | ≥ 15 | ≥ 27 | ||
| Example | 770 | 680 | 20 | 90 |
• X-ray Inspection Requirement: Level I
• Moisture Content in Coating: ≤ 0.15%
Recommended Welding Current (DC+)
| Electrode Diameter (mm) | 2.5 | 3.2 | 4 | 5 |
| Electrode Length (mm) | 300 | 350 | 400 | 400 |
| Welding Current (A) | 70–90 | 80–110 | 130–170 | 160–200 |
Precautions
1. Electrodes must be baked at 350–380°C for 1 hour before use, and used immediately after baking.
2. Before welding, remove rust, oil, moisture and other contaminants from the workpiece, and preheat to approximately 200°C.
3. Use short-arc operation during welding, and narrow weave bead technique is recommended.
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