Page 11 - КЛАСИФІКАЦІЯ ЛОКАЛІЗОВАНИХ ДЕФЕКТІВ ЗВАРНИХ ШВІВ НА РЕНТГЕНІВСЬКИХ ЗОБРАЖЕННЯХ ТРУБ

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Due to the development of new relevant features of defects in the weld zone of

oil and gas pipes, the probability of correct classification of spherical pores and slags

is increased.

A method for determining the geometric dimensions of lack of penetration

according to the groove standard of sensitivity on radiographic images of welds is

developed. The efficiency of its application is confirmed and the relative

measurement errors are established.

A method of noise-tolerant structure-adaptive segmentation of the joint of two

elements in the system of automatic control of their electron beam welding has been

developed, which allows to present the joint trajectory in analytical form, thus

providing increased accuracy of trajectory reproduction.

A number of methods for segmentation of characteristic elements of metal

fractures and calculation of their ratio is proposed. The type of fracture is a criterion

for assessing the quality of the metal. According to the degree of metal deformation,

fractures are divided into brittle, viscous and quasi-brittle.

Studies have shown the usefulness of the texture feature of homogeneity based

on the co-occurrence matrix for the segmentation of fractographic images. However,

the size of the processing window and the size of the small objects to be removed

may affect the results of the proposed method of allocating brittle and viscous
fracture zones.

The method of subgrain contour detection of low-alloy steel of steam lines of
thermal power plants is developed on the basis of the watershed method, which

allows to automate the process of quantitative analysis of subgrains according to their
metallographic image.

A number of methods for segmentation of characteristic elements of oxide

ceramic and laser-modified alloy coatings is proposed. Diagnostic features are the

ratio of the area of pores to the surface area and pore size.

An express method for determining the number and size of surface defects in

oxide ceramic coatings by optical photographs of the surface is proposed and

substantiated. It uses a multi-scale function to localize and further segment the