What are the four types of welding non-destructive testing?

Date：2023-04-06 15:05:12Views：576

Welding is a widely used technology in the manufacturing industry, which creates structurally powerful products by fusing two or more metal components together. However, during the welding process, defects may occur, which may lead to product failure and endanger personnel safety and cost-effectiveness. To ensure the quality of welding, welding testing is required.

Welding inspection can be divided into different types, which cover various technologies and methods for selection in different applications. Among them, welding non-destructive testing technology has become an important component of modern welding technology. Non destructive testing refers to the detection of defects in welding materials through non-invasive methods without causing any damage to the welding material.

The following are four common types of welding non-destructive testing:

Ultrasonic Testing (UT)

Ultrasonic testing is a technique that uses high-frequency acoustic detectors to detect defects in welding materials. It determines whether there are defects in the weld by propagating ultrasonic waves along the weld and detecting their reflection. This detection technology is widely used to detect internal defects in welding, such as pores, cracks, etc.

Radiographic Testing (RT)

Radiographic testing is a technique that uses X-ray or gamma ray detectors to detect defects in welding materials. It can display internal defects in welding, such as cracks, holes, etc. This technology is usually used to detect larger welds, such as pipelines, containers, etc.

Magnetic Particle Testing (MT)

Magnetic particle testing is a technique that uses magnetic powder to detect surface and near surface defects in welding materials. The magnetic field passes through the weld seam coated with magnetic powder to detect defects such as cracks and holes. This detection technology is usually used to detect welds in magnetic materials, such as steel, iron, etc.

Liquid Penetrant Testing (PT)

Penetrant testing is a technique that penetrates liquid onto the surface of welding materials to detect surface cracks and other surface defects. This detection technology is usually used to detect the surface of non-magnetic materials, such as aluminum and stainless steel. In penetration testing, a layer of permeable liquid is first applied to the surface of the welding material. Then, by placing it at a higher temperature, the liquid penetrates into the surface cracks of the welding material. Finally, remove the coating from the welding material, leave the permeable liquid in the surface defect, and then use a fluorescent lamp or visible light to inspect the location of the defect.

These four welding non-destructive testing techniques all have their advantages and disadvantages. When selecting the appropriate technology, it is necessary to consider factors such as the characteristics of the detection object, detection purpose, detection accuracy, and detection cost. With the continuous development of modern technology, welding non-destructive testing technology is also constantly evolving and improving. In the future, these technologies will be more accurate, fast, safe, and intelligent, providing more reliable guarantees for the development of the manufacturing industry.

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