Applied standards:
- ASME/AWS: A5.5 E7018-A1
Characteristics – applications:
- VD-7018-A1 is the electrode under the group of low hydrogen. Metal is supplemented with molipden, so the welded joints are high-temperature. Welding slags are easily blistered and cleaned without splashing and explosion.
- Suitable for welding low-alloy steel having Mo content up to 0.65% under 490 – 550 (Mpa) load and working at high temperature such as process furnace, burner, thermoelectricity, etc.
Chemical composition (%):
| C | Mn | Si | P | S | Mo | |
| Required | ≤ 0.12 | ≤ 0.9 | ≤ 0.6 | ≤0.03 | ≤0.03 | 0.4~ 0.65 |
| Obtained | 0.06 | 0.85 | 0.48 | 0.02 | 0.009 | 0.5 |
Mechanical property of weld metal:
| Yield strength (Mpa) |
Tensile strength (Mpa) |
Elongation (%) |
Impact value (J) |
Heat treatment (0C xh) |
|
| Required | ≥ 400 | ≥ 490 | ≥ 25 | Not required | 620±15 x1 |
| Obtained | 580 | 660 | 26 | – | 620±15 x1 |
Instructions for use:
- Clean oil, grease and dust before welding
- Dry the electrode at 300 ~350 0 C for 30 ~60 minutes before welding
- Process welding edges as regulated
- Select appropriate welding current to avoid possible defects
- Lining weld beads should use a Ø3.2 electrode.
- Use AC or DC± power
- Size of the electrode and used current:
| Diameter (mm) | Ø 3.2 | Ø 4.0 | Ø 5.0 | |
| Length (mm) | 350 | 400 | 400 | |
| Amperage (A) | Flat welding | 100~140 | 140~180 | 180~220 |
| Vertical welding & Bare welding | 80~120 | 120~160 | 160~200 | |
