Radiography Testing

In radiography testing, the part to be inspected is placed between the radiation source and a piece of radiation sensitive film. The radiation source can either be an X-ray machine or a radioactive source. The radiation that passes through the part will expose the film and forms a shadow graph of the part. The film darkness (density) will vary with the amount of radiation reaching the film through the test object where darker areas indicate more exposure (higher radiation intensity) and lighter areas indicate less exposure (higher radiation intensity).

Radiography CNDT- A-STAR Group services


  • Weld inspection – Structural / Piping
  • X-Rays, Gamma Rays (Iridium 192, Selenium 75, Cobalt 60)
  • SCAR Radiography, Close Proximity Radiography
  • Corrosion Under Insulation (CUI), Profile Radiography
  • Casting / Forgings / Regulators

Ultrasonic Testing

Ultrasonic Testing (UT) uses high frequency sound energy to conduct examinations and make measurements. Ultrasonic inspection can be used for flaw detection/evaluation, dimensional measurements, material characterization, and more. To illustrate the general inspection principle, a typical pulse/echo inspection configuration as illustrated below will be used.


  • Weld inspection – Structural / Piping
  • Lamination Checking in Plates/Pipes
  • Casting / Forgings / Valves

Magnetic Particle Inspection

Magnetic particle inspection (MPI) is a non destructive testing method used for defect detection in magnetic materials. MPI is fast and relatively easy to apply, and part surface preparation is not as critical as it is for some other NDT methods. These characteristics make MPI one of the most widely utilized non destructive testing methods.


  • Weld inspection – Structural / Piping
  • Casting / Forgings / Valves

Penetrant Testing

Liquid penetrant inspection is a method that is used to reveal surface breaking flaws by bleed out of a coloured or fluorescent dye from the flaw. The technique is based on the ability of a liquid to be drawn into a “clean” surface breaking flaw by capillary action.


  • Weld inspection – Structural / Piping
  • Casting / Forgings / Valves

Hardness Testing

Hardness is a characteristic of a material, not a fundamental physical property. It is defined as the resistance to indentation, and it is determined by measuring the permanent depth of the indentation. More simply put, when using a fixed force (load)* and a given indenter, the smaller the indentation, the harder the material.


  • Verification of Hardness after PWHT
  • Material Hardness verification after machining
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