Fan rotors require a secure, concentric fit to their drive shafts to prevent rotational slippage and maintain balance against continuous vibration and centrifugal forces. However, in many motors and cooling units, the rotor assembly must be removable for maintenance or component replacement. This demands a retaining compound that provides structural holding power combined with easier serviceability.
The optimal solution is a retaining compound engineered for structural holding power while offering the lowest strength for serviceability.
INCURE WeldLock™ 338 Retaining Compound (Yellow)
The INCURE WeldLock™ 338 Retaining Compound is the functional “Medium Strength” solution. It is designed for press or slip-fit applications where future disassembly is required, providing excellent resistance to rotational torque and vibration without making future maintenance a destructive process.
| Key Feature | Performance for Fan Rotors to Shafts |
| Serviceable Bond (Yellow) | Specifically designed for assemblies requiring removal or repositioning. Locks the rotor securely against rotational slip but allows for non-destructive removal when the motor or fan needs service. |
| Excellent Vibration Resistance | Provides reliable holding power against continuous rotational vibration and imbalance forces, maintaining the rotor’s concentricity. |
| Gap Fill (Up to 0.25mm) | Effectively fills the annular space, eliminating play that could lead to slippage, fretting, and noise. |
| Temperature Resistance (150∘C) | Maintains integrity under the heat generated by the motor and air friction. |
Application Steps: Installing Fan Rotors to Shafts
For optimal performance and reliable retention of the fan rotor, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean both the shaft surface and the rotor bore. Surfaces must be free of all grease, oil, and residue. Use an industrial cleaner or solvent (e.g., acetone) and wipe dry.
- Activate (If Needed): If using passive metals (like stainless steel) or if the ambient temperature is below 15∘C(59∘F), apply a chemical activator to the bond surfaces and allow it to flash off completely.
2. Product Application
- Apply: Apply a continuous, thin bead of WeldLock™ 338 around the full circumference of either the shaft or the internal bore of the rotor hub.
- Ensure Coverage: For optimal retention, ensure the adhesive completely wets the entire mating surface as the components slide together.
3. Assembly and Curing
- Assemble: Immediately slide or press the rotor onto the shaft. Ensure the rotor is correctly positioned on the shaft before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after assembly.
- Cure: Allow the assembly to fixture before handling (typically 10-30 minutes). Allow a full 24 hours for the compound to reach maximum strength before placing the fan into service.