D707
D707 is a tungsten carbide surfacing welding electrode with low-hydrogen sodium, which adopts DCEP connection method. It is more suitable for low current welding. The surfacing metal contains 40-50% tungsten and has high hardness.
The product is applicable for surfacing welding of mechanical parts with high rock wear resistance requirements, such as concrete mixer blades, bulldozers and pump blades, dredger blades, high-speed sand mixing boxes, etc.
Chemical components of deposited metal (%)
Test item |
C |
Mn |
Si |
W |
| Example value | 2.85 | 2.0 | 1.22 | 30.0 |
Hardness of surfacing layer:
Test item |
HRC |
| Example value | 60 |
Reference current (DC )
Welding electrode diameter (mm) |
Φ3.2 |
Φ4.0 |
Φ5.0 |
| Welding current (A) | 70-120 | 140-180 | 180-220 |
1. Before welding, the welding electrode should be baked at 300-350℃ for 1h.
2. The preheating temperature is above 300℃ when the surfacing part is carbon steel, 400-500℃ when it is low alloy steel and 600-650℃ when it is stainless steel.
3. Low alloy steel and stainless steel should be annealed at 700℃ after welding.
2. The preheating temperature is above 300℃ when the surfacing part is carbon steel, 400-500℃ when it is low alloy steel and 600-650℃ when it is stainless steel.
3. Low alloy steel and stainless steel should be annealed at 700℃ after welding.
