We found an insert missing but no broken pieces. Can we tell whether it fractured or pulled out?

It may provide useful evidence, but the absence of fragments does not settle the mechanism. Preserve the empty location and adjacent parts, document their as-found condition, and leave fracture versus joint separation unresolved until a qualified investigation can assess the available surfaces and records.

Record the empty location and remaining joint without cleaning away evidence

Assign the empty position a location reference on an overview of the blade. Photograph it from several accessible directions under safe workshop conditions. Include the surrounding steel, the edges of any material remaining in the seat and the neighbouring inserts. A close-up without its position and orientation can make comparison with production or installation records unnecessarily difficult.

Do not grind, scrape or rebond the location to make the photograph clearer. Ask the receiving investigator what cleaning, if any, is appropriate. If safe handling requires removal or containment, document the initial condition and the handling step. Keep packaging materials from rubbing against surfaces that the investigator has asked to preserve.

The insert troubleshooting guide introduces several forms of loss and damage. This case is narrower: deciding what an empty location can support when the missing component itself is unavailable. The report should say “insert absent at inspection,” not begin with an assumed failure mechanism.

Compare adjacent inserts, pre-service photos and retained pieces

Compare adjacent positions using the same scale and viewing direction. Record visible cracks, chipped corners, displaced material or apparently intact neighbours without assigning a shared cause. If pre-service photographs exist, link each image to this blade rather than to another item with the same part number. A generic product photograph cannot establish that the missing insert was present before use.

Look for the last inspection that actually included the affected position. If it is unavailable, record that fact. Add known installation, maintenance, route and incident history, identifying whether each item is a contemporaneous record or a later recollection. An absence discovered at the yard may have developed at an unknown point during the shift.

CERATIZIT's joining reference provides relevant background on joint considerations; it is not a remote diagnostic test. Neither a visual resemblance to an example nor a proposed manufacturing explanation establishes what happened to this particular assembly.

Label fracture versus joint loss as unresolved until qualified examination

Ask the investigator which questions can be answered from the retained blade and which require material or process records. A useful response may distinguish confirmed observations, plausible mechanisms and evidence that would discriminate between them. The investigation does not need a premature single-cause label to be useful for a maintenance or purchasing decision.

Send the order, drawing revision, lot reference, position map and handling record together. Identify other inspected pieces from the same lot, but do not describe an uninspected delivery as unaffected. If the missing location has already been altered, explain exactly how. That limitation may reduce what can be concluded without making every remaining record worthless.

Keep the serviceability decision with the qualified equipment authority. When requesting replacement carbide components, distinguish restoring safe equipment from accepting a conclusion about liability or material suitability. Record the final classification honestly, including “mechanism undetermined” where the evidence cannot separate fracture, joint loss or a sequence involving both.