AWS NDE Coordination key terms

Inspection methods that reveal flaws or measure characteristics of a weld or component without damaging it, including visual, penetrant, magnetic particle, ultrasonic, and radiographic techniques.

The broader discipline of testing materials and assemblies for discontinuities or property variations without impairing their serviceability; used interchangeably with NDE in many codes and contracts.

Choosing which examination technique applies to a given joint based on material, thickness, geometry, discontinuity type of concern, and code requirements, balancing detection capability against cost and access.

Direct or remote observation of a weld and surrounding surfaces for profile, alignment, surface discontinuities, and cleanliness; usually the first and least costly examination performed and required before other methods.

A surface method that applies a visible or fluorescent liquid to a cleaned surface, removes excess, and uses developer to draw penetrant from surface-breaking openings, revealing cracks, porosity, and laps.

A surface and near-surface method for ferromagnetic materials that magnetizes the part and applies iron particles, which cluster at discontinuities that interrupt or distort the magnetic flux field.

A volumetric method that transmits high-frequency sound into material and analyzes reflected or transmitted signals to locate and size internal discontinuities and measure thickness or bond quality.

A volumetric method that passes X-rays or gamma radiation through an assembly onto film or a digital detector, producing an image whose density variations reveal internal discontinuities such as porosity, slag, and lack of fusion.

Examination that interrogates the interior of a weld or part rather than only its surface, principally ultrasonic and radiographic methods, and generally requires more planning and safety controls.

A written document describing how an NDE method will be applied, including equipment, technique, calibration, coverage, acceptance criteria, and documentation, so results are repeatable and auditable.

A project-specific document that qualifies and details the examination technique, referencing the governing code, essential variables, and personnel qualifications; often must be approved before examination begins.

A reference piece with known dimensions or artificial reflectors used to set sensitivity, verify equipment performance, and compare indications against a standard before and during examination.

Scheduled verification that NDE instruments and probes produce correct, traceable responses within tolerance, documented in records that demonstrate the examination was valid at the time performed.

A device of known geometry placed on the source side or film side during radiography to demonstrate that the technique achieves the required image quality and sensitivity for the material thickness.

The degree of darkening on a radiograph, controlled within a specified range so that contrast and detail are adequate for interpreting discontinuities without overexposure or underexposure.

A signal or image feature produced by an examination that requires evaluation; an indication may prove to be a relevant discontinuity or a harmless geometric or metallurgical artifact.

An indication caused by part geometry, surface condition, or equipment rather than an actual flaw; it must be recognized and dismissed so it does not trigger unnecessary repair.

Any interruption in the normal structure of a material or weld, such as porosity, slag, cracking, or lack of fusion; not all discontinuities are defects because acceptance depends on size, type, and location.

A discontinuity that exceeds applicable acceptance criteria or otherwise makes the item unfit for service, requiring repair, removal, or engineering disposition before acceptance.

The code, specification, or contract limits that define which indications are acceptable and which require rejection or repair, stated in terms of type, size, location, and distribution.

Cleaning and conditioning of the examination area, such as removing scale, paint, spatter, or roughness, so the chosen method can achieve adequate sensitivity and avoid false or missed indications.

The specified period a penetrant remains on the surface, or a developer remains before inspection, allowing the test medium to perform as intended and making results comparable between examinations.

Documented evidence that an examiner meets the training, experience, and examination requirements of a recognized certification scheme for the method and level at which they perform or supervise work.

A certified examiner qualified to perform examinations under a written procedure, set up equipment, interpret results against criteria, and report findings, but generally not to establish procedures independently.

The structured program, such as a national or industry standard, that defines training hours, experience, examination content, and recertification for NDE personnel, providing objective evidence of competence.

The documented result of an examination, including method, procedure, equipment, calibration, personnel, coverage, indications, and disposition, retained to prove compliance and support later investigation.

A stage in the work sequence where the activity may not proceed without the designated inspector's documented review or release, used to ensure examination occurs before covering or closing work.

A step the inspector may observe if notified but which does not stop the work if the inspector declines or is absent, distinguishing it from a mandatory hold point.

Planned or random monitoring of work activities and records to confirm that procedures, personnel, and quality controls are being followed as specified, without necessarily stopping production.

A written document that provides the welding variables, such as process, filler, current range, preheat, and pass sequence, required to produce welds meeting the qualified procedure.

The record of the actual variables and destructive test results from welding a test coupon, documenting that a proposed procedure produces joints meeting mechanical and soundness requirements.

A welding parameter, such as process, filler classification, thickness range, or preheat, that if changed beyond specified limits requires requalification of the procedure or the welder's performance.

A test demonstrating that an individual welder can produce a weld meeting required soundness and mechanical criteria using a specific process and position, certifying that person's capability.

The requirement that a qualified welder use the process within a defined period, often six months, without a break caused by layoff or reassignment, or else requalification is required.

The person responsible for planning, executing, and supervising welding production and quality activities, including procedure control, personnel qualification, consumable control, and coordination with inspection.

Energy introduced per unit length of weld, calculated from arc voltage, current, and travel speed; it influences cooling rate, hardness, toughness, and distortion in the completed joint.

Controlled heating of the base metal before welding to slow cooling, reduce hydrogen cracking risk, and improve fusion, with the minimum temperature specified and verified by the procedure.

The temperature of the weldment between passes, which must be kept within a specified range; excessive interpass temperature can degrade toughness and mechanical properties even when preheat was correct.

Delayed cracking in weld metal or heat-affected zone caused by absorbed hydrogen combined with restraint and hard microstructure, prevented through low-hydrogen consumables, preheat, and controlled cooling.

Practices ensuring filler metals and fluxes are correct, properly stored, and used within limits, including baking and holding of low-hydrogen electrodes and prevention of moisture pickup.

Unintended change in shape or dimensions from uneven heating, shrinkage, or fit-up errors, managed through sequencing, balanced welding, restraint planning, and correct fit-up before welding.

The alignment, gap, bevel, and cleanliness of parts before welding; poor fit-up can force procedure changes, create stress concentrations, and cause discontinuities that later examination reveals.

A project document sequencing the inspections and tests required at each stage, identifying the responsible party, the reference criteria, and whether each step is a hold or witness point.

The planned system of procedures, audits, and records that provides confidence that welding and examination activities consistently meet specified requirements before and during production.

The operational activities, such as inspection, testing, and measurement, that verify individual welds and materials conform to requirements and that nonconforming items are identified and corrected.

A systematic, independent review of records, procedures, and work practices to verify that the quality system is implemented effectively and that corrective actions address identified weaknesses.

Controlled removal and rewelding of a rejected area, performed under an approved repair procedure with reexamination of the repaired region and documentation of the original indication and disposition.

A structured investigation to determine why a defect or quality failure occurred, distinguishing the immediate cause from underlying system causes so corrective action prevents recurrence.

The ability to link materials, consumables, welds, and examination results to their records and origin, enabling verification of compliance and investigation of problems found later.