1) Radiographic testing of welded joints

Radiographic testing is based on the dependence of the x-ray (gamma) radiation intensity, transmitted through the tested item, from the absorber material and its thickness. If the tested item has defects, the emission is absorbed unevenly and, registering its distribution at the output, it is possible to judge the internal structure of the item tested.

Radiographic testing is used to detect cracks, incomplete penetration, porosity, foreign inclusions (tungsten, slag) in welded joints, as well as to identify inaccessible for external inspection undercuts, convexity and concavities of the root, excessive penetration.

2) Ultrasonic testing of welded joints and materials

Ultrasonic testing is a method of testing and searching for hidden and internal mechanical defects of unacceptable size in the tested items.

3) Time of flight diffraction nondestructive testing of welded joints (TOFD)

TOFD method is based on the interaction of ultrasonic waves with the tips of the discontinuities. This interaction leads to the emission of diffraction waves in a wide range of angles. The detection of the diffracted waves allows to determine the presence of discontinuities.

Advantages of ToFD method

• the possibility to reach a higher accuracy during measurements, usually ± 1 mm, and during re-testing ± 0.3 mm;
• defect detection doesn’t depend on its angular position;
• defect parameters measurement is based on the diffraction signals sound path time and does not depend on the signal amplitude;
• high performance of testing, as the scanning is carried out along one line while testing the entire volume of the joint;
• recording and storage of test results;
• 100% repeatability of test results;
• measurement of metal erosion on internal surface;
• alternative to nondestructive radiographic testing.

4) Magnetic particle inspection of welded joints and material

Magnetic particle inspection, which is also called the magnetic suspension method, is based on the detection of metal integrity loss by the accumulation of magnetic powder around the defect. Scattering flows and magnetic poles are formed in these areas, attracting particles of the powder.

5) Penetrant testing

Penetrant testing is the most sensitive method of nondestructive testing. Penetrant methods of nondestructive testing include methods based on capillary penetration of indicating liquids (penetrants) into surface and through defects. The occurring indications are usually seen visually. With the help of penetrant methods, the location of defects, their extent and orientation on the surface are determined. Penetrant nondestructive testing is used when it is necessary to identify small defects where visual inspection cannot be applied.

6) Hardness Testing

Hardness testing is a method of nondestructive testing of metal, alloys, rubber, plastic, concrete and other materials hardness.  Hardness testing requires special instruments to be used, i.e. hardness testers. Syrlasu LLP specialists use portable hardness testers for testing. They are mobile and allow to measure the hardness of the material in hard-to-reach locations.

7) Measurement of protective coating thickness and holiday testing

During performance of construction and installation works, the quality control of the protective coatings is of particular importance. The quality of protective coatings is checked step-by-step during insulation works.

8) Soil moisture and density testing, including the radioisotope method for determining density and humidity

One of the main requirements during construction and installation works performance is the preparation of a rigid roadbed. At the same time, it is important to properly compact soils or other materials, used for the roadbed construction. Insufficient compaction leads to roadbed deformation, resulting in disturbed evenness of the dressing, and the potential damage. In order to ensure the proper quality of works during roadbed construction, a technical control over the compaction should be organized. Specialists of our company check the humidity and density of soils, moreover the radioisotope method allows to carry out necessary inspections of soils and to provide findings on site, without spending time for laboratory testings that considerably saves time of construction and installation works performance.