J707
Description:
J707 is a low hydrogen sodium type coating low alloy high strength steel electrode. Using DC reverse, can be full position welding. If necessary, the weldment is preheated and welded and tempered before welding.
use:
Mainly used for welding the corresponding strength of low alloy steel structure. 15MnMoV, 14MnMoVB, 18MnMoNb, etc. The structure after welding can work under the condition of welding or tempering (550-650 ℃).
Deposited metal chemical composition (%)
| C | Mn | Si | S | P | Mo |
guarantee value | ≤0.15 | 1.65 ~ 2.00 | ≤0.60 | ≤0.035 | ≤0.035 | 0.25 ~ 0.45 |
Example value | 0.074 | 1.83 | 0.30 | 0.005 | 0.018 | 0.37 |
Deposited metal mechanical properties (620 ℃ × 1h)
Pilot projects | Rm (N / mm 2 ) | ReL / Rp 0.2 (N / mm 2 ) | A (%) | KV 2 (J) |
-30 ° C |
guarantee value | ≥690 | ≥590 | ≥15 | ≥27 |
Example value | 730 | 630 | twenty four | 72 |
Deposited metal diffusion hydrogen content: ≤ 4.0ml / 100g (glycerol method)
X-ray detection: I level
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 140 | 110 ~ 210 | 160 ~ 230 |
Precautions:
1. Before welding electrode to be about 350 ~ 400 ℃ baking 1h, on the 100 ~ 150 ℃ incubator, with the use of take.
2. Welder should be removed before welding rust, oil, water and other impurities.
3 welding must be used to operate short arc welding is appropriate.
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