What are the commonly used quality inspection methods for straight seam steel pipes?

There are many quality inspection methods for straight seam steel pipes (ERW pipe or LSAW pipes), and physical methods are the most commonly used ones. Physical inspection is a method of measuring or inspecting certain physical phenomena of steel pipes. Generally, non-destructive testing is used to check the internal defects of welded tube. At present, there are methods such as ultrasonic flaw detection, magnetic flaw detection, radiographic flaw detection and penetrant flaw detection.

1. Magnetic test

Magnetic flaw detection is to use the change of the magnetic field of the metal part in the magnetic field to find the defect. According to different detection methods, it can be divided into magnetic induction method, magnetic powder method and magnetic recording method, among which the magnetic particle method is the most widely used.

2. Penetration inspection

Penetrant inspection is to use the permeability of a certain liquid to find defects in steel pipes, including fluorescent penetration and coloring inspection flaw detection, which can be used to inspect defects on the surface of magnetic and non-ferromagnetic materials.

3. Radiographic flaw detection

Radiographic flaw detection is a method of flaw detection that uses the characteristics of rays penetrating and attenuating in substances. Radiographic inspection is mainly used to check defects such as incomplete penetration, pores, cracks, and slag inclusions. According to different rays, it can be divided into X-ray flaw detection, high-energy ray flaw detection, and gamma-ray flaw detection. Due to the different methods of displaying defects, it is divided into fluorescent screen observation method, ionization method, photographic method and industrial television method.

4. Ultrasonic flaw detection

When ultrasonic waves propagate in metals and other homogeneous media, the reflection waves of the sound waves on different media interfaces are different, so it can be used to detect internal defects. Ultrasonic can detect defects in any weldment material and any part, and is usually used in combination with radiography.

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