Visual testing (VT)
The first and most widely used method: weld profile, size and surface imperfections such as cracks, undercut and porosity are checked by eye, with gauges and good lighting.
NDT – Non-Destructive Testing
Surface and volumetric NDT: VT, PT, MT, UT, PAUT, TOFD, AUT and RT, with personnel certified to ISO 9712 Level 2 and Level 3.
Non-destructive testing
NDT without damaging the part
Non-destructive testing checks welds and materials for flaws without affecting their use. We cover surface and volumetric methods, with personnel certified to ISO 9712 Level 2 and Level 3, and we define and review NDT across the project.
- Surface methods: VT, PT and MT
- Volumetric methods: UT, PAUT, TOFD, AUT and RT
- Definition of the NDT extent
- Review of NDT operator qualifications
- NDT reporting and documentation
Surface methods
Flaws open to the surface
Penetrant testing (PT)
A coloured or fluorescent liquid penetrates open surface defects, and a developer draws it out to make cracks and pores visible. Suitable for non-magnetic materials too.
Magnetic particle testing (MT)
The part is magnetised and magnetic particles gather where a surface or near-surface defect disturbs the field. Used on ferromagnetic steels.
Volumetric methods
Flaws inside the weld
Ultrasonic and radiographic methods reveal flaws within the full thickness of the weld.
Ultrasonic testing (UT)
Manual ultrasonic testing with a handheld probe, flexible for any geometry.
Learn morePhased array (PAUT)
Steered beams and recorded cross-section images of the weld.
Learn moreTOFD
Accurate sizing of flaw height from diffracted signals.
Learn moreAutomated UT (AUT)
Mechanised scanning of pipeline girth welds, as equipment and personnel.
Learn moreRadiographic testing (RT)
Qualified RT operators through personnel leasing.
Learn moreNDT personnel
Operators certified to ISO 9712 Level 2 and Level 3, worldwide.
Learn moreLevel 2 personnel set up and perform the tests, interpret and evaluate the results against the acceptance criteria and write the reports. Level 3 personnel can also establish techniques and procedures and supervise the NDT activity, as defined in ISO 9712.
Related services
Often combined with
Inspection & Quality Control
NDT as part of the complete inspection plan.
Learn moreEquipment Rental
NDT equipment, with or without an operator.
Learn moreTechnical Consultancy
Defining the NDT extent in the ITP.
Learn moreNeed NDT on your welds?
Tell us the method, the materials, the joints and the acceptance standard.