Hardfacing and wear mechanisms
Hardfacing and wear mechanisms – interactive engineering module focused on hardfacing and wear mechanisms. Learning format: Decision guide · Active learning. Explains the principle, technical relationships and practical use.
Topic overview
Overlay welding deliberately combines a tough or lower-cost base material with a functional layer. The layer may resist wear, corrosion, high temperature or cavitation, or restore component dimensions. The decisive factors are not only hardness, but wear mechanism, dilution, microstructure, cracking susceptibility and layer bonding .
The most common production mistake is selecting an overlay by HRC hardness without understanding whether the component is subject to abrasion, impact, adhesion, corrosion, erosion or a combination of these mechanisms.
Restores component shape after wear or machining. The filler material is selected for compatibility with the base material and subsequent machining.
Reduces dilution or forms a metallurgical barrier before the final layer. Used for dissimilar joints, repairs of CrMo steels or corrosion-resistant cladding.
What the module covers
- Overlay welding is surface engineering, not merely ‘adding material by welding’.
- Types of overlay-welding operation
- Dimensional restoration
- Transition layer
- Hardfacing
- Corrosion-resistant overlay
- Wear: diagnose first, then select the filler material
- Overlay-welding processes and their technological profile
Related engineering terms
The module connects these terms with practical engineering explanations:
Continue with the practical module.
Open this topic directly in the interactive WeldScope portal.