J757
Description:
J757 is a low hydrogen sodium type of low alloy high strength steel electrodes. Using DC reverse, can be full position welding.
use:
For welding tensile strength equivalent to about 740N / mm2 low alloy high strength steel structure.
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Mo |
guarantee value | ≤0.20 | ≥1.00 | ≤0.60 | ≤0.030 | ≤0.030 | ≤1.00 |
Deposited metal mechanical properties (620 ℃ X1h)
Pilot projects | Rm (N / mm 2 ) | ReL / Rp 0.2 (N / mm 2 ) | A (%) | KV 2 (J) at room temperature |
guarantee value | ≥740 | ≥ 640 | ≥13 | - |
X-ray inspection:
I level
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 110 | 130 ~ 170 | 160 ~ 230 |
Deposited metal diffusion hydrogen content:
4.0 ml / 100 g (glycerol method)
Precautions:
1. Before welding electrode to be 400 ℃ baking 1h, with baking with.
2. Welder must be welded before the removal of rust, oil, water and other impurities.
3. Welding with short arc operation, narrow-channel welding is appropriate.
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