Applied standards
- ASME/AWS A5.1E6012; E6013
- JIS: D4313
- GB: E 4313
Characteristics – applications:
- J421 – VD is the electrode under the group of rutile sheath. The welded joints are less defective and easy to ignite arc in which arc is stable without splashing and slags are self-blistered. Welded joints are ductile.
- Suitable for welding low-carbon steel under 430 ~ 490 Mpa load such as sectional steel structures, barge, ferry, basin, civil welding, etc.
- Possibly welding at all positions including vertical welding from top to bottom
Chemical composition (99%):
| C | Mn | Si | P | S | |
| Required | Not required | ≤ 0.04 | ≤ 0.035 | ||
| Obtained | – | – | – | 0.030 | 0.016 |
Mechanical property of weld metal:
| Yield strength (Mpa) |
Tensile strength (Mpa) |
Elongation (%) |
Impact value (J) |
|
| Required | ≥ 331 | ≥ 414 | ≥ 17 | Not required |
| Obtained | 390 | 480 | 26 | 00C: 50 Room temperature: 65 |
Instructions for use:
- Clean oil, grease and dust before welding
- If the electrode is wet, dry it at 70 ~100 0 C for 30 ~60 minutes before welding
- Process welding edges as regulated
- Select appropriate welding current to avoid possible defects
- Use AC or DC± power
- Size of the electrode and used current:
| Diameter (mm) | Φ 2.5 | Φ 3.2 | Φ 4.0 | Φ 5.0 | |
| Length (mm) | 300 | 350 | 400 | 400 | |
| Amperage (A) | Flat welding | 70~90 | 110~130 | 160~210 | 210~250 |
| Vertical welding & Bare welding | 60~80 | 90~120 | 130~180 | 180~230 | |
