What each NDT method contributes

Inspection stage matters

Examination before final machining may provide access to the forging volume, while final-surface examination can detect machining or finishing damage. Heat treatment should occur before the specified final NDT stage when the procedure requires examination of the delivered condition.

Repairs, re-heat treatment or weld build-up can trigger re-examination. The purchase order should state hold and witness points.

Acceptance criteria must be written

A report that says “UT OK” is weak evidence unless it identifies the procedure, sự định cỡ, coverage, sensitivity, acceptance standard, operator qualification and item traceability. Different projects can apply different allowable indications.

Define the code paragraph, ASTM practice, owner specification or approved procedure that governs acceptance.

What a useful NDT report includes

• Flange description, heat number and item identification
• Method, written procedure and acceptance criteria
• Thiết bị, probe or consumable details and calibration
• Examination surfaces, coverage and stage
• Indication records and disposition
• Operator name, certification level, date and authorization