Transparent prerequisite screen · no ranking · no automatic qualification level

NDT Method Prerequisite-Screening Worksheet

Record the target and method-specific feasibility evidence for VT,PT,MT,UT,RT and ET. The worksheet can expose a basic incompatibility or missing prerequisite;it cannot select a technique,acceptance level or personnel authorization in place of the applicable product code and written procedure.

ISO9712:2021 scope correctedISO17635:2025 weld boundaryNo invented scoresStarts blank

Document the inspection problem

“Verified” means the named prerequisite is supported in the source record for this exact product,geometry,material,condition and procedure.It does not mean that the method is approved.

Application scope

Primary discontinuity/measurement target

Relevant material behaviour

VT view,illumination,resolution and access

PT surface,porosity,cleaning and media compatibility

MT magnetization,surface coverage and technique

UT sound path,coupling,attenuation,geometry and reference

RT source/detector geometry,technique and radiation safety

ET conductivity,probe access,frequency and reference standard

Personnel certification,competence and employer authorization

Product,material,geometry,thickness and condition record

Product code,quality requirement,written procedure and acceptance record

Decision boundary: a “candidate for procedure review” status means only that this small screen found no stated basic contradiction.It does not establish probability of detection,sensitivity,coverage,technique,testing level,acceptance level,personnel authorization,regulatory compliance or fitness for service.A qualified organization must apply the controlling product code and approved written procedure.

Transparent screening rules

方法	Target gate in this screen	Required evidence before candidate status
VT	Visible condition or surface-breaking target	Applicable view/access,illumination,resolution and written technique.
PT	Surface-breaking target	Accessible surface that is not excessively porous and is inert/compatible with test media,plus process controls.
MT	Surface-breaking or near-surface target	Ferromagnetic material and documented magnetization/surface technique.
UT	Near-surface,internal or wall-loss target	Applicable sound path,coupling,attenuation,geometry,calibration/reference and written technique.
RT	Internal planar or volumetric target	Applicable source-detector geometry,image technique,material/thickness and authorized radiation-safety controls.
ET	Surface,near-surface or wall-loss target	Electrically conductive material,probe access,frequency/reference standard and application document.

These gates are intentionally conservative and incomplete.They remove impossible or unsupported claims but do not rank methods.Combinations can be required,and discontinuity orientation can dominate detectability.

Standards and scope boundary

ISO9712:2021,Edition5 is the current published standard for qualification and certification of industrial NDT personnel in specified methods.It does not select the method,technique,testing level or acceptance criteria for a product,and certification alone is not this worksheet’s employer authorization or job-specific written instruction.No Level1/2/3 is automatically assigned.

ISO17635:2025,Edition4 gives method-choice and evaluation guidance only for welds in metals,based on quality requirements,material,weld thickness,welding process and inspection extent.It also states that acceptance levels are not a direct detailed interpretation of ISO5817/ISO10042 quality levels.The former universal component/defect score was not an ISO17635 table.

Public scope examples: ISO17637:2016,Edition2 covers VT of fusion welds and is confirmed2022;ISO3452-1:2021,Edition3 covers PT of surface-open discontinuities on compatible,not excessively porous materials and explicitly does not provide acceptance criteria;ISO9934-1:2016,Edition3 covers MT general principles for ferromagnetic materials and does not define acceptance;ISO17640:2018,Edition4 has a narrow default scope for manual UT of low-attenuation metallic fusion welds at least8mm thick,primarily full-penetration ferritic joints,and is currently to be revised.

ISO/TC44/SC5 catalogue lists current radiographic weld parts ISO17636-1:2022 (film) and ISO17636-2:2022 (digital detectors),not an undifferentiated “ISO17636”.ISO15549:2019,Edition2,under review,defines ET general principles and application-document guidance.Specific technique,testing and acceptance requirements remain NEEDS_LICENSED_SOURCE unless the applicable full product/procedure documents are available.

修正内容

The former page assigned undocumented numerical scores and rankings from only component,defect,material and generic access.It displayed fixed ISO standards and Level1–2/Level2 as if ISO9712 selected them;treated VT as always recommended;called PT valid for any material;blanket-excluded every composite from ET;and reduced austenitic UT to “use low frequency probes.”Those outputs ignored thickness,orientation,product code,technique,calibration,acceptance,procedure and safety.

The replacement starts blank,removes scores,ranks and automatic qualification levels,and requires an application/state/procedure/personnel record.It reports all six methods in a stable order with explicit reasons and only four statuses:OUTSIDE_STATED_TARGET,PHYSICAL_PREREQUISITE_NOT_MET,PREREQUISITE_NOT_ESTABLISHED,or CANDIDATE_FOR_QUALIFIED_PROCEDURE_REVIEW.No method is approved or recommended.