Nondestructive Examination Coordination
What coordination actually means
On a construction or fabrication job, the NDE coordinator is the hinge between the welding team, the quality department, and the examination technicians. You are not usually the person shooting the film or scanning the weld; you are the person deciding what gets examined, when, by whom, and to what acceptance standard, then proving it happened. A candidate must understand the main volumetric and surface methods (radiography, ultrasonic, magnetic particle, liquid penetrant, visual), what each can and cannot detect, and how technique selection follows from joint geometry, material, and the flaw type of concern. Know that surface methods find surface-breaking discontinuities while volumetric methods see internal ones, and that ultrasonic struggles with coarse-grained material and thin sections where radiography excels.
Documentation and traceability
Coordination lives in paperwork: examination requests, technique sheets, personnel certification records, calibration certificates, and reports tied to specific weld identification. The recurring theme is traceability from the weld map to the report. Questions love to test whether you know that a certified technician with a lapsed calibration or an expired method certification cannot produce valid results, no matter how good the image looks.
Traps to expect
Watch for questions that swap method capability (asking penetrant to find lack of fusion), that confuse acceptance criteria from different codes, or that imply examination timing is flexible. Ferromagnetic material is required for magnetic particle; austenitic stainless generally is not. Radiography of thick sections needs adequate energy and density control. Timing matters: many codes require examination after a specified hold, and repairs need re-examination under the same original technique.
Rule of thumb
Match the method to the flaw, confirm the technician is current in that method and level, and never release a report without a weld ID, procedure reference, and acceptance standard. If any of those three is missing, the examination is administratively incomplete even if the technique was perfect.
Worked example
A carbon steel butt weld shows surface indications; you need both surface and internal coverage. Run magnetic particle for surface-breaking flaws and radiography or ultrasonic for internal ones, then reconcile both reports against the same weld ID and acceptance criteria.