YD688 is a CO₂ gas-shielded flux-cored surfacing wire whose deposited metal is a chromium carbide surfacing layer. It provides excellent wear resistance and is intended for repair of high-wear parts. The arc is stable and bead formation is good. Surface cracks in the deposited metal help reduce cooling stress.
Key Features
Excellent Wear Resistance from Chromium Carbide Deposit
The deposited metal is a chromium carbide surfacing layer with excellent wear resistance, suitable for high-wear parts such as wear plates, coal mill rolls, cement mill rolls, and mill discs.
Stable Arc & Good Bead Formation
YD688 provides stable arc burning and good bead formation during surfacing.
High Hardness with Moderate Impact Resistance
The wire is intended for parts requiring high hardness and high wear resistance. It delivers high hardness and wear resistance, with moderate impact resistance, making it suitable for wear-resistant applications under moderate impact conditions.
Surface Cracks Help Reduce Cooling Stress
Fine surface cracks may form on the chromium carbide deposit. They help relieve residual stress generated during cooling and reduce the risk of spalling or more severe cracking. This is a characteristic of chromium carbide surfacing deposits.
Specifications
Typical Chemical Composition (%)
| C | Si | Mn | Cr |
| 2.5-5.0 | 0.5-1.5 | 0.5-1.5 | 22.5-27.5 |
Surfacing Layer Hardness: HRC ≥44
Type: CO₂ gas-shielded flux-cored surfacing wire; deposited metal is a chromium carbide surfacing layer
Polarity: DC+
Shielding Gas: 100% CO₂
Available Diameters: Φ1.2 mm
Packaging:15 kg/spool (standard); other packaging formats available per requirement
Operating Notes
- Before welding, remove rust, oil, moisture, and other impurities from the workpiece.
- Use DC reverse polarity.
- CO₂ gas flow rate should be 20–25 L/min.
- Wire extension should be controlled within 15–25 mm.
- Preheating and interpass temperature are recommended at around 300°C.
Ideal For
Surfacing of parts requiring high hardness and high wear resistance, such as wear plates, coal mill rolls, cement mill rolls, and mill discs. Excellent wear resistance with moderate impact resistance.