Non-Destructive Testing (NDT), the integrity of a material or part without causing damage It is a set of inspection methods that evaluate and detect discontinuities in welds, castings, and pressure equipment without damaging the part. AES Innovation, With NDT personnel and solution partners certified according to EN ISO 9712. It offers non-destructive testing services in the field.
Short answer: NDT (Neurodestructive Testing) detects internal and surface defects (cracks, pores, weld defects, loss of thickness) without disassembling or damaging the part. The main methods are VT, PT, MT, UT, RT, and ET; each is suitable for different defect types and materials.
What is Non-Destructive Testing (NDT)?
NDT (Neural Tracking) is used in manufacturing quality control and operational integrity testing. It covers a wide range of applications, from the acceptance of welded components to the periodic integrity assessment of pressure vessels and pipelines. The aim is to identify defects before they develop into failures, leaks, or accidents, thus preventing damage to the component.
NDT Methods
| Method | Abbreviation | What is it used for? |
|---|---|---|
| Visual Inspection | VT | Surface defects, general condition, and geometry. |
| Liquid Penetrant | PT | Open cracks on the surface (of any type of material) |
| Magnetic Particle | MT | Surface and subsurface cracks (ferromagnetic) |
| Ultrasonic | UT | Internal discontinuities and wall thickness measurement. |
| Radiographic | RT | Visualization of internal defects (welding, casting) |
| Eddy Current | MEAT | Surface crack and conductive material/tube inspection. |
Application Areas
- Acceptance inspection of welded fabrication and steel structures.
- Pressure vessels, boilers and heat exchangers
- Pipelines and process piping
- Cranes, lifting equipment and support structures
- Quality control of cast and forged parts.
- Storage tanks and metal structures
Technical Acceptance Criteria (EN ISO 5817 / EN ISO 9712)
In welding inspections, defect acceptance limits are determined according to EN ISO 5817 with one of three quality levels; for method-based acceptance levels, the correlation with EN ISO 17635 is used.
| Quality level | Requirement level | Typical application |
|---|---|---|
| B | The highest (strictest) | Dynamic/pressure-critical manufacturing. |
| C | Middle | General structural resources |
| D | Basic (acceptable) | Low stress applications |
- Methods: Visual (VT, EN ISO 17637), penetrant (PT), magnetic particle (MT), ultrasonic (UT, EN ISO 17640) and radiographic (RT) examination.
- Employee: Certified according to EN ISO 9712 Level 1/2/3; certificate valid for 5 years.
The values are summarized based on EN ISO 5817; the applicable acceptance level will be determined according to the implementation standard and the contract.
AES Innovation NDT Process
- Scope and method selection: The appropriate NDT method is determined based on the material, defect type, and standard.
- Procedures and acceptance criteria: The procedure is prepared according to the relevant standard and customer specifications.
- Field application: Certified personnel conduct the inspection on-site.
- Evaluation: The findings are evaluated according to the acceptance criteria.
- Reporting: An NDT report is prepared, including the method, results, and any discrepancies.
Relevant Standards
NDT applications; for personnel EN ISO 9712 (NDT personnel certification), for welding inspection. EN ISO 17635 and for the admission criteria EN ISO 5817 / ASME The process is carried out based on the following methodology standards: EN ISO 3452 (PT), EN ISO 17638 (MT), EN ISO 17640 (UT), EN ISO 17636 (RT). (NDT, AES is outside the scope of TÜRKAK accreditation and is carried out with certified personnel and solution partners.)
Frequently Asked Questions
Which NDT method is suitable for which defect?
PT/MT is used for surface cracks, UT/RT for internal discontinuities, UT for wall thickness, and VT for general conditions. The method is selected according to the material, defect type, and standard.
Who prepares the NDT report?
The inspection is carried out by NDT personnel certified according to EN ISO 9712, and a report containing the results is prepared.
Why is NDT non-destructive?
Because the part is inspected without being disassembled, cut, or damaged, the equipment can continue to be used after the inspection.
Frequently Asked Questions
What methods does non-destructive testing (NDT) encompass?
The main methods are VT (visual), PT (penetrant), MT (magnetic particle), UT (ultrasonic), RT (radiographic), and ET (edge current). The choice of method depends on the material, defect type, and accessibility.
What certifications should NDT personnel possess?
NDT personnel must hold Level 1/2/3 certification according to EN ISO 9712; certification is generally valid for 5 years.
How are sourcing criteria determined?
Welding quality levels are defined as B (most stringent), C, and D according to EN ISO 5817; the applicable quality level is determined by product standard and contract.
Is NDT accredited by TÜRKAK?
NDT is outside the scope of AES's accreditation; this service is carried out by EN ISO 9712 certified personnel and solution partners.
Free: NDT Checklist
Download a practical NDT checklist in 6 sections (preparation, VT, PT/MT, UT/RT, evaluation, reporting) as a PDF. It will be sent to your email instantly.