Thin wall welded pipe inspection inspection method

Thin wall welded pipe magnetic inspection

Thin-wall welded pipe magnetic flaw detection can only find defects on the surface and near surface of the magnetic welded pipe, and only quantitative analysis can be made for the defects. The nature and depth of the defects can only be estimated based on experience. The magnetic test is to use the magnetic flux magnetized ferromagnetic welded pipe to generate magnetic flux leakage to find defects. According to the method of measuring magnetic flux leakage, it can be divided into magnetic powder method, magnetic induction method and magnetic recording method, among which magnetic powder method is the most widely used.

Thin wall welded pipe penetration test
Thin-wall welded pipe penetration inspection uses physical properties such as permeability of certain liquids to find and display defects, including coloring inspection and fluorescence detection, and can be used to check defects on the surface of ferromagnetic and non-ferromagnetic materials.

Thin wall welded pipe radiographic inspection
Thin-walled tube ray inspection is a method of flaw detection that uses radiation-permeable substances and attenuating properties in matter to detect defects. According to the different rays used in flaw detection, it can be divided into three types: X-ray inspection, γ-ray inspection and high-energy radiation inspection. Due to the different methods of displaying defects, each type of radiographic inspection is divided into ionization method, screen observation method, photographic method and industrial television method. The ray inspection is mainly used to inspect cracks, incomplete penetration, pores, slag inclusions, etc. inside the welded pipe weld.

Ultrasonic flaw detection of thin-walled pipe
Ultrasonic thin-walled pipe welds can be used for the inspection of internal defects due to reflections at the interface of different media in the propagation of metals and other homogeneous media. Ultrasonic can inspect any weldment material, any part of the defect, and can detect the location of the defect more sensitively, but it is difficult to determine the nature, shape and size of the defect. Therefore, welded pipe ultrasonic testing is often used in conjunction with radiographic inspection.