Description:
W707Ni is a low hydrogen sodium type coating containing Ni low temperature steel electrode, DC reverse, all-position welding. Deposited metal at -70 ℃ still has good impact toughness.
use:
Welding -70 ℃ work 09Mn2V, 06MnVAl and 3.5Ni steel and other low temperature structure.
Deposited metal chemical composition (%)
C | Mn | Si | S | P | Ni | |
guarantee value | ≤0.12 | ≤1.25 | ≤0.60 | ≤0.030 | ≤0.030 | 2.00 ~ 2.75 |
Example value | 0.057 | 0.90 | 0.30 | 0.006 | 0.015 | 2.50 |
Deposited metal mechanical properties (620 ℃ × 1h)
Pilot projects | Rm (N / mm 2 ) | ReL / Rp 0.2 (N / mm 2 ) | A (%) | KV 2 (J) |
-70 ° C | ||||
guarantee value | ≥550 | ≥460 | ≥17 | ≥27 |
Example value | 610 | 520 | 28 | 90 |
X-ray inspection:
Ⅰ level
Reference current (DC + )
Electrode diameter (mm) | φ2.0 | φ2.5 | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 40 ~ 70 | 60 ~ 90 | 90 ~ 120 | 140 ~ 180 | 170 ~ 210 |
Precautions:
1. Before welding electrode to be 350 ~ 400 ℃ baking 1.5h, with the baking with the use.
2. Welder must be removed before welding rust, oil, water and other impurities.
3. The use of short arc welding operation, narrow-channel welding is appropriate.
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