Four things make a braze fail
Poor wetting, the wrong filler, thermal expansion mismatch and residual stress. Each leaves a different signature in the failed joint.
Wetting, cleanliness and flux
Molten filler will not bond to an oxidised or contaminated surface. Cleanliness before heating and a flux that stays active through the cycle decide whether the filler wets the whole face or only part of it — and partial wetting fails under load.
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Filler alloy and thermal mismatch
Carbide and steel expand at different rates, so every braze cycle leaves residual stress in the joint. The filler choice and the cooling rate decide whether that stress is tolerable or whether it begins a crack that propagates in service.
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Inspect the joint, not just the insert
A pull test, a hardness check, an ultrasonic scan or a dye penetrant test each find a different class of defect. Choose the one that matches the failure you have seen.
Destructive and non-destructive methods
Pull tests and shear tests quantify bond strength on samples. Ultrasonic, eddy current and penetrant testing look for voids and cracks in production. The useful specification names one of each: a sample test for validation and a production test for control.
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Process control that prevents defects
Temperature control, atmosphere, fixturing and cooling rate are the variables worth recording per batch. Brazing defects are almost always process drift rather than a single bad lot, so the record is what makes the problem findable.
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Brazing questions
Why do brazed inserts come off?
Usually incomplete wetting or residual stress. Both are process outcomes: a surface that was not clean enough for the filler to wet, or a cooling rate that left the joint pre-loaded.
Which filler alloy is best for plow inserts?
One selected for the service temperature and the impact load, with a melting range that suits the process. The correct choice depends on the carbide grade and the carrier steel, not on a single figure.
How do I check bond quality without destroying parts?
Ultrasonic or eddy-current inspection for voids, and penetrant testing for surface-breaking cracks. Both can be applied to production batches.
Does brazing weaken the carbide?
The heat cycle can affect the carbide near the joint, and the mismatch with the steel leaves residual stress. Good process control manages both; a poor cycle makes the insert more likely to crack.
Should I specify brazing or mechanical retention?
Brazing gives a continuous bond and better load transfer. Mechanical retention allows field replacement. Choose based on whether the insert has to be serviceable in the field.
Insert retention
Brazed, clip-based and mechanically fixed inserts.
Quality control and testing
The wider QC picture at the factory.
Manufacturing process
From powder metallurgy to a finished edge.
Insert wear and inspection
Reading in-service insert wear.
Send us a failed joint
A failed insert shows which mechanism is at work. Send a photograph or a sample and we will identify it.
✓ Photograph or sample of the failure
✓ Batch and delivery details
✓ Service conditions and hours
✓ Volume and application
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