J507Q
Description:
J507R is a low-hydrogen sodium type derusting carbon steel electrode for pressure vessel, which is reverse-connected in DC. It can be used for all-position welding. It has excellent welding process performance, stable arc, less spatter and easy slag removal. Its deposited metal has excellent The mechanical properties and crack resistance, low temperature impact toughness.
use:
For pressure vessels, pressure pipes and other medium-carbon steel and low alloy steel structure of the welding.
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Ni | Cr | Mo | V |
standard value | ≤0.15 | ≤1.60 | ≤0.75 | ≤0.020 | ≤0.030 | ≤0.30 | ≤0.20 | ≤0.30 | ≤0.080 |
Example value | 0.070 | 1.20 | 0.62 | 0.008 | 0.012 | 0.010 | 0.032 | 0.008 | 0.004 |
Deposited metal mechanical properties
Pilot projects | Rm (N / mm 2 ) | Rel (N / mm 2 ) | A (%) | KV 2 (J) |
-30 ° C |
standard value | 490 ~ 610 | ≥400 | ≥22 | ≥54 |
Example value | 545 | 450 | 32 | 150 |
X-ray inspection:
Ⅰ level
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 90 ~ 130 | 140 ~ 180 | 180 ~ 230 |
Precautions:
1. Before welding electrode to be about 350 ℃ baking 1h, with baking with.
2. Welder should be removed before welding rust, oil, water and other impurities.
3. Welding with short arc, narrow welding is appropriate.
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