Stainless steel welded pipe customized how to test product quality

Stainless steel welded pipe made to order quality inspection methods have a variety of methods, including physical methods are also commonly used inspection methods, physical inspection is the use of some physical phenomena for determination or inspection methods. Material or stainless steel welded pipe internal defects inspection, generally using non-destructive flaw detection methods. The current nondestructive flaw detection has magnetic flaw detection, ultrasonic flaw detection, ray detection, penetration detection, etc..

Magnetic inspection

Magnetic flaw detection can only find magnetic stainless steel welded pipe customized surface and near-surface defects, and the defects can only do quantitative analysis, for the nature and depth of the defects can only be estimated based on experience. Magnetic inspection is the use of magnetic field magnetization ferromagnetic stainless steel welded pipe produced by the magnetic leakage to find defects. According to the different methods of measuring magnetic leakage, it can be divided into magnetic powder method, magnetic induction method and magnetic recording method, in which the magnetic powder method is widely used.

Penetration test

Penetration test is to use the permeability of certain liquids and other physical properties to find and show defects, including coloring test and fluorescence detection of two kinds, can be used to check the ferromagnetic and non-ferromagnetic material surface defects.

Radiation flaw detection

Ray flaw detection is the use of radiation can penetrate the material and in the material has the characteristic of attenuation to find defects of a flaw detection method. According to the different rays used in flaw detection, can be divided into X-ray flaw detection, γ-ray flaw detection, high-energy ray flaw detection. Because of its method of displaying defects is different, each ray detection are divided into ionization method, fluorescent screen observation method, photographic method and industrial television method. Ray inspection is mainly used to test the stainless steel welded pipe weld internal cracks, unwelded, porosity, slag and other defects.

Ultrasonic flaw detection

Ultrasonic waves in the metal and other uniform media propagation, due to the interface in different media will produce reflections, so it can be used for the inspection of internal defects. Ultrasonic can test any weldment material, any part of the defects, and can be more sensitive to find the location of the defects, but the nature, shape and size of the defects is more difficult to determine. Therefore, ultrasonic flaw detection of stainless steel welded pipe is often used in conjunction with ray inspection.