A method which allows to detect any incompatibilities underneath the surface of an examined material which may occur at a depth of couple of millimeters. This method is applied only in ferromagnetic materials testing.

Ultrasonic examinations belong to non-destructive testing methods which give information on the condition of the whole volume of the examined element and allow to determine the quantity, the size and the arrangement of discontinuities occurring in the examined material.

Radiographic examination allows to detect and to determine any welding mismatches (especially the internal ones). The examination makes use of the capability of ionizing radiation (X or γ) to permeate through materials and to record its effect on a radiographic film.

Destructive tests allow to obtain the information on physical condition, defects, anomalies and properties of the examined material or object. The destructive tests, however, cause alterations in the material's or object's properties.

A basic preliminary test entailing a thorough examination of a surface which aims at detecting any discontinuity surfaces and defects in the shape of elements. To conduct the tests various devices are employed, for instance: weld gauges, calipers, magnifying glasses, sets of mirrors, videoscope.

An examination which allows to detect any welding mismatches appearing on the surface of the material. This method is applied in ferromagnetic materials, non-ferromagnetic materials and non-metallic materials testing.