Non-Destructive Testing (NDT)

A variety of tests used for detecting discontinuities in the material, evaluating its properties and taking measurements without causing damage or changing the functional quality of the tested object. We provide:
visual testing (VT)penetrant testing (PT)magnetic particle testing (MT)radiographic testing (RT)ultrasonic testing (UT)ultrasonic thickness testing (UTT)

Tests carried out with the naked eye, with the help of magnifying implements or a remote observation device. They are used to examine accessible and non-accessible surfaces of various materials. Their aim is:
  • to detect through discontinuities
  • to detect surface discontinuities such as fractures and corrosive pits, and in welding: flooding, concave joints and lack of penetration.

Tests carried out by applying highly visible – colour or fluorescent – penetrating liquids onto the surface of metal, alloy or non-metal samples. Their aim is:
  • to detect discontinuities open to the surface, inconsistencies of welded joints, leakage of tanks, pipes and other appliances
  • to detect both manufacturing and operating fractures.

Tests carried out on ferromagnetic samples exposed to constant, alternate or impulse magnetic field. Magnetic particles and inductive transmitters indicate disruption in the induced magnetic field, exposing discontinuities. Their aim is:
  • to detect surface and subsurface discontinuities such as fractures, bubbles, voids and non-metallic inclusions
  • to detect shallow and narrow discontinuities
Samples made out of iron, steel, nickel, cobalt or their alloys can be tested with this method but not non-ferromagnetic and non-metallic ones

Tests where a penetrating radiation of X or Gamma rays is sent through the object. Its radiometric image is registered, and a radiogram or real-time digital record of the testing are obtained. Tests carried out on all metal, alloy and non-metal samples. Their aim is:
  • to detect discontinuities in welded joints, castings, forgings and other metallurgical products that occurred in manufacturing or operation
  • to detect internal, surface and subsurface discontinuities as well as spatial and shallow ones such as bubbles, incomplete fusions (fixtures), fractures, inclusions, flooding, lack of weld penetration in welded joints.

Tests where the object is subjected to ultrasonic pulse-waves which are reflected when discontinuities are struck, and are diffracted and diffused at the edges of these flaws.Tests carried out on all metals and their alloys as well as non-metal materials such as plastics, ceramics, glass, rubber or concrete. They are most effective with objects produced through rolling, casting, drawing and forging. Their aim – depending on the type of waves used – is:
  • to detect internal, surface and subsurface flaws
  • to determine lack of adhesion in bonded, welded, soldered and riveted joints
  • to define the properties of materials
  • to detect shallow and spatial discontinuities, internal and surface fractures, inclusions and delamination in objects produced in rolling and drawing, fractures in forgings, discontinuities in castings, discrepancies in welded joints.

Tests carried out in order to gauge the thickness of materials by measuring the speed of a longitudinal ultrasound wave going through the tested object. They are conducted during manufacturing as well as in operation, and useful when only one side of the object is accessible. UTT are performed on objects with parallel surfaces such as pipes, pipelines as well as tanks, slabs and sheets, castings and forgings made of metal, plastic, glass, rubber, fiberglass and composite materials.