J707RH
Description:
J707RH is a low hydrogen sodium type of ultra-low hydrogen high toughness electrode. Using DC reverse, can be all-position welding, welding process performance is good, deposited metal has good ductility and toughness.
use:
For the hull structure of the welding, but also for yield strength ≥ 590N / mm 2 level of high strength steel welding of important structures.
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Ni | Mo |
guarantee value | ≤0.10 | 1.20 ~ 1.60 | ≤0.50 | ≤0.020 | ≤0.020 | 2.00 ~ 2.80 | 0.25 ~ 0.60 |
Example value | 0.053 | 1.45 | 0.19 | 0.005 | 0.011 | 2.47 | 0.36 |
Deposited metal mechanical properties (620 ℃ × 1h)
Pilot projects | Rm (N / mm 2 ) | ReL / Rp 0.2 (N / mm 2 ) | A (%) | KV 2 (J) |
-50 ° C |
guarantee value | ≥690 | ≥590 | ≥15 | ≥34 |
Example value | 740 | 650 | twenty three | 80 |
Deposited metal diffusion hydrogen content:
≤ 4.0ml / 100g (chromatography or mercury method)
X-ray inspection:
Ⅰ level
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 120 | 130 ~ 180 | 170 ~ 240 |
Precautions:
1. Before welding electrodes to be 400 ℃ baking 2h, with baking with the use.
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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