Differences between seamless steel pipe and seam steel pipe flaw detection

Flaw detection method of seamless steel pipe:

Seamless steel pipe is made of billet through special processing method, and its internal structure is uniform and there are no steel pipe welding defects. When flaw detection of seamless steel pipe, ultrasonic flaw detection technology is mainly used. Ultrasonic flaw detection technology has the advantages of fast flaw detection speed, wide detection range, accurate flaw detection results, etc., and can detect internal defects and foreign matter of seamless steel pipe.

Flaw detection method of seam steel pipe:

Seam steel pipe (welded pipe) is made by welding steel plates, and there may be different degrees of welding defects inside it, such as incomplete penetration, weld cracks, pores, etc. When flaw detection of seam steel pipe, radiographic flaw detection and ultrasonic flaw detection technology can be used. Radiographic flaw detection technology can detect various welding defects inside seam steel pipe, and radiographic flaw detection can also detect quality problems such as cracks on the surface of steel pipe. Ultrasonic flaw detection technology can detect defects and foreign matter inside seam steel pipe, but its detection ability for welding defects is weaker than radiographic flaw detection.

Advantages and disadvantages of flaw detection methods:

1. Ultrasonic flaw detection technology is the most widely used technology for flaw detection of seamless steel pipes and seamed steel pipes. Its advantages are fast flaw detection speed and wide detection range. It can detect all defects and foreign matter inside the detection point, but the detected welding defects are relatively difficult to detect.

2. The detection ability of radiographic flaw detection technology for welding defects is better than that of ultrasonic flaw detection technology. It can detect smaller welding defects and can also detect quality problems on the surface of steel pipes. However, since rays are harmful radiation and have certain harm to the human body, radiographic flaw detection technology is subject to certain restrictions in practical applications.

On the whole, for different types of steel pipes, different qualified standards and use environments of pipes, corresponding flaw detection methods need to be selected to ensure the quality and safety of pipes. During the flaw detection process, the detection personnel need to work carefully and carefully to ensure the accuracy and reliability of the detection results.

Read more: Non-destructive testing of seamless pipes