Low Temperature Steel Welding Electrode
W707Ni
GB/T E5515-C1
Description: W707Ni is a low-temperature steel electrode containing Ni in a low-hydrogen sodium coating. Use DCEP (direct current electrode positive) and can welded in all positions. The deposited metal still has good impact toughness at -70°C.
Application: Used for welding low temperature steel such as 2.5Ni.
Chemical composition of weld metal(%):
|
C |
Mn |
Si |
Ni |
S |
P |
|
≤0.12 |
≤1.25 |
≤0.60 |
2.00 ~ 2.75 |
≤0.020 |
≤0.025 |
Mechanical properties of weld metal:
|
Test item |
Tensile strength Mpa |
Yield strength Mpa |
Elongation % |
Impact value (J) -70℃ |
|
Guaranteed |
≥540 |
≥440 |
≥17 |
≥27 |
Diffusion hydrogen content of deposited metal: ≤6.0mL/100g (glycerin method) or ≤10mL/100g (mercury or gas chromatography method)
X-ray inspection: I grade
Recommended current:
|
（mm） Rod diameter |
2.0 |
2.5 |
3.2 |
4.0 |
5.0 |
|
（A） Welding Current |
40 ~ 70 |
60 ~ 90 |
90 ~ 120 |
140 ~ 180 |
170 ~ 210 |
Notice:
- The electrode must be baked for 1 hour at 350℃ before welding operation;
- It is essential to clean up rusty, oil scale, water, and impurities on welding parts before welding;
- Try to use small line energy when welding, multi-layer and multi-pass welding.
