Four failures, four causes
Even wear means the specification is roughly right. Chipping means impact. Cracking means stress. Inserts coming loose means the joint.
Wear, chipping and cracking
Uniform wear is the design working. Chipped corners indicate impact loading from obstacles and point at geometry or grade. Cracks running from the joint into the insert indicate residual stress or thermal damage from the braze cycle.
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Loss and progressive bond failure
An insert that disappears leaves a mark on the pocket and the surrounding edge. Where several inserts are lost from the same blade, the pattern usually indicates a process problem rather than an in-service event.
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Match the inspection to the consequence of failure
Visual inspection suits most fleets. Where failure has safety or contract consequences, add a non-destructive method and name it in the purchase order.
Visual and dimensional checks
Look for chipped corners, cracks at the joint, missing inserts and any change in the spacing pattern. Measure the remaining insert height at fixed points to build a wear rate that can be compared across the fleet.
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Non-destructive testing
Ultrasonic inspection finds internal voids and cracks in the bond. Dye penetrant finds surface-breaking cracks. Eddy-current methods sort material and detect near-surface defects. Each has a cost, and each is justified only where the consequence justifies it.
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Insert inspection questions
How do I tell wear from damage?
Wear is progressive and even across the edge; damage is localised and sudden. Chipping, cracks and lost inserts are damage events and point at impact or the joint rather than at the grade.
How often should inserts be inspected?
Visually at every service interval, and dimensionally whenever the blade comes off. On high-impact routes a post-storm visual check finds most damage while it is still small.
Do I need ultrasonic testing?
Only where failure is expensive or unsafe — airports, high-speed highway work, heavy impact duty. For most fleets the same money is better spent on a proper visual checklist.
What does a missing insert tell me?
That the joint failed. If several are missing from one blade, suspect the braze process for that batch rather than the service conditions.
Can wear data predict replacement?
Yes, if you measure at fixed points and record operating hours. Two seasons of records are enough to forecast replacement with useful accuracy.
Brazing and bond quality
Why the joint fails before the insert.
Re-tipping and rebuilding
Rebuilding an edge rather than replacing it.
Quality control and testing
Factory inspection and batch traceability.
Wear and lifespan
Turning wear data into a replacement plan.
Send a wear pattern for analysis
Photographs of the worn edge and the hours it took are usually enough for us to identify the mechanism.
✓ Photographs of the worn edge
✓ Operating hours or kilometres
✓ Surface, ice and obstacle conditions
✓ Current insert specification
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