Detection of seamless steel pipe

Detection methods are mainly magnetic particle inspection of seamless steel pipe or penetrant testing can be effectively found surface cracks, folding, surface defects heavy leather, hairline, pinholes. For ferromagnetic materials, magnetic particle testing method should be given priority, because of its high detection sensitivity; for non-ferromagnetic material, such as stainless steel seamless pipe, is used penetrant testing method.

When both ends of the cut is less reserve margin, due to structural reasons, detection means, both ends of the head may not be effectively detected, and the end is the most likely site of the presence of cracks or other defects. If the end of the cracks tend to have potential, weld heat affected during installation is also possible to make a potential crack. Therefore, it should be noted that after the detection of certain seamless steel tubes welded area, the expansion pipe ends to detect defects on the online use of austenitic seamless steel pipe, when the insulation is damaged or there may be rain infiltrated the site, it should be noted penetration testing to find stress corrosion cracking or pitting and other defects, but the magnetic particle or penetrant testing can only be detected on the outer surface of the pipe, internal and surface defects are powerless. Detection of the inner surface, in particular the crack defect class detection must be carried out by ultrasonic testing.