Description:
W707 is a low hydrogen sodium type coating of low temperature steel electrode, DC reverse, all-position welding. Deposited metal at -70 ℃ still has good impact toughness.
use:
Welding -70 ℃ low-temperature steel work, such as 09Mn2V, 09MnTiCuRe and so on.
Deposited metal chemical composition (%)
C | Mn | Si | S | P | Cu | Ni | |
guarantee value | ≤0.10 | ≤1.60 | ≤0.90 | ≤0.035 | ≤0.035 | ≤1.00 | 0.50 ~ 1.20 |
Example value | 0.060 | 1.00 | 0.27 | 0.006 | 0.015 | 0.62 | 0.62 |
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 | ≥490 | ≥400 | ≥20 | ≥27 |
Example value | 570 | 480 | 29 | 80 |
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. Welding should try to use small and medium-sized specifications, multi-layer multi-track welding, layer temperature control at 200 ℃ below.
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