Technique Support

Contact Us

SINO ENGINEERING  GROUP(HK) CO., LIMITED
Beijing Add:18th  Floor ,Bright China Chang An Buliding  
158 Indoor Street,Jianguo Gate,Dongcheng  District ,Beijing China
Tel: +86 10-57196788Fax:  +86 10-57199088
Mobile:+86 185 14056500 +86 185 01918313
E-MAIL:sinoengineergroup@163.com
 
Skype:LCPIPES/sinoengineergroup
Website: www.sinoengineergroup.com 

Current Postion: Home > Technique Support > Products Specification
Products Specification

Stainless steel seamless pipe crack detection method

 

Stainless steel seamless pipe crack detection method

                                Stainless steel seamless pipe has a high requirement on quality in the environment of high temperature and pressure. Improper machining operation process in the production process may roll or drawing die setting improper reasons and on the pipe, as a result of a crack. Folding, warping, scratches, or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.


   

Eddy current testing is to establish a non-destructive detection method, on the basis of the electromagnetic induction it sine current excitation probe coil, the induced electromotive force generated when the probe near the Seamless surface, the alternating magnetic field around the coil rims surface generates an induction current, i.e. vortex. The vortex is also the feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil. The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.