Magnetic particle testing or penetrant testing of seamless steel tubes
Date:2016-03-06 View(s):2725 Tag:Magnetic particle testing
Magnetic particle testing or penetrant testing can effectively find surface cracks, folding, heavy leather surface defects, hairline, pinhole. 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, penetrant testing method is used.
When both ends of the reservation resection margin is less, since the knot when Kay Casino reason detecting device configuration, both ends of the head and sometimes the lack of effective detection, but is most likely to end the presence of cracks or other defects in the site. If the ends for cracks tend to have potential, weld heat affected during installation may also make potential crack. Therefore, it should be noted that after the detection of certain seamless steel tubes welded area, to discover the defect extension pipe ends.
Online austenitic seamless steel pipe, insulation is damaged or when rain may have infiltrated the site should be noted that penetration testing to find stress corrosion cracking or pitting and other defects.
However, magnetic particle or penetrant testing can only detect the outer surface of the steel pipe, the inner surface defects are powerless. The inner surface of the detection, especially crack detection of such defects must be carried out by ultrasonic testing.