Mounting an impeller onto a pump shaft is a specialized, high-stress application. This joint is subject to significant torsional load (torque), high axial forces (thrust), and constant exposure to the pumped fluid (water, chemicals, oil, etc.).The impeller’s alignment and rigidity are crucial for pump efficiency and preventing cavitation. Standard keyways and threads often leave micro-clearances that allow for fretting corrosion and eventual fatigue failure under constant fluid forces. A high-strength retaining compound eliminates this clearance, creating a rigid, slip-free bond that maximizes hydraulic efficiency.
INCURE WeldLock™ 365 Retaining Compound
For securing high-speed impellers—where permanent retention, high load resistance, and precise concentricity are paramount—the WeldLock™ 365 provides the highest structural integrity. Its superior shear resistance prevents rotational slip, resists thrust loads, and ensures the impeller runs perfectly true, which is vital for preventing vibration and cavitation.
| Feature & Benefit | Technical Insight for Impeller-Shaft Assemblies | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to torsional slip and heavy axial thrust. | Zero Slippage: Guarantees absolute, 100%torque transmission and prevents fretting corrosion. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C (392∘F), essential for pumps handling hot fluids or generating friction heat. | End the Heat Threat: Ensures the bond remains strong and rigid under maximum thermal load. |
| Fills Close Clearance Gaps | Ideal for components with an interference or true close-tolerance slip fit (less than 0.05 mm diametral clearance). | Maximizes Concentricity: Converts the fit into an integrated component, optimizing balance and hydraulic efficiency. |
| Fluid Immunity | Inert to water, oil, and many industrial chemicals, ensuring the integrity of the joint is protected within the pumped medium. | Reliability Assured: The bond remains permanently intact throughout the pump’s operational life. |
Application Steps: Locking Impellers for Maximum Pump Efficiency
Preparation (Essential): Thoroughly clean both the impeller bore and the pump shaft surface. Remove all oil, grease,paint, and residue. Use a degreasing solvent (like acetone or brake cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the shaft surface. Alternatively, apply it to the inside circumference of the impeller bore. Ensure the compound completely covers the mating area.
Assembly: Slide or press the impeller onto the shaft. Ensure the impeller is seated correctly (axially) and wipe away any excess compound immediately.
Curing Time (Critical): Allow a minimum of 24 hours for the compound to reach full cure strength before introducing fluid, operational pressure, or running the pump.
Alternative Consideration (Worn or Large Gaps): If the bore-to-shaft clearance is larger (up to 0.25 mm), use INCURE WeldLock™ 356 (Metallic Grey). This compound is formulated with metallic fillers to tolerate larger gaps while still providing high retention strength.
Stop risking impeller slip and ensure your pump assemblies deliver maximum power and hydraulic performance.