Standard Flawed Specimens

Advanced weld flaw evaluation

Standard Flawed Specimens are designed and manufactured to meet the requirements of all known internationally recognised Qualification Programme.

  • Advanced training and practice prior to qualifications on:
    • Flaw detection
    • Flaw sizing
    • Flaw interpretation
  • Realistic size welds
  • Common weld geometries

Sonaspection flawed specimens are avaliable either individually or in sets.

Individual specimens

Contain three different flaw types and are:

  • All different sizes
  • Uniquely numbered
  • Supplied with NDE reports
  • Supplied with acceptance/rejection criteria

Recommended sets

  • Contain a selection of individual specimens as above, with an average of three flaws per specimen
  • Contain at least one example of each flaw type listed in the flaw table
  • Contain a minimum total weld length of 360cm (144”)

Custom sets

Manufactured specifically for recognised qualification schemes – for example ASNT, ACCP and API.

For Level II training, practice and qualification i.e. ACCP, SNT-TC-IA, BS EN ISO 9712, API and others.

Standard specifications

Sonaspection reserves the right to alter specifications shown at any time.


The range of flaws available depends on the type of testing being used. See appropriate Flaw Table for full details

Material tolerances

Weld length for plates, tees and Ys, all 30cm (12”) ±5%.
Weld length for pipes, nozzles and nodes, all as per diameter
Thickness ±10%
Diameters ±10%

Flaw size range

Flaw length from 1 cm (3/8″) to 4.5 cm (1 3/4″)
Flaw through wall height 0.3 cm (1/8″) to 0.6 cm (1/4″)

Surface finish

Parent material adjacent to weld will be a suitable finish for testing the weld profile, either ‘as-welded’ or ground flush

Flaw tolerances

Flaw length ± 0.3 cm (1/8″)
Flaw height ± 0.2 cm (5/64″)
Distance from datum ± 0.3 cm (1/8″)
Depth from surface ± 0.2 cm (5/64″)

Final inspection

All specimens are subject to in-house Visual and Non-Destructive Examination. This work is carried out by experienced and approved technicians

Material types

All standard-size specimens are manufactured from carbon steel. For plate, tee and Y specimens material conform to EN 10025 Pipe specimens is to ASTM, ANSI, API or similar (Nozzles and nodes are a combination of both)All pipe sizes are measured outside diameter

Corrosion protection

All specimens are coated with a clear corrosion-resistant material before leaving the factory


All materials are subject to 100% visual and Non-Destructive Examination to ensure that they are free from flaws which may interfere with product performance.


All export orders are suitably packed