methods [url=http://www.cheapmlbdiamondbacksjerse

Eddy Current Testing and Magnetic Flux Leakage Testing of Seamless Steel Tube Business Articles | April 16 Wholesale Diamondbacks Hats , 2014
With the development of the national economy, all kinds of seamless steel tubes are widely used in petrochemical and boiler manufacturing and other industries, particularly high temperature, high pressure and harsh working conditions, on the quality of seamless steel tubes have higher requirements.?

Seamless steel pipe usually after smelting, casting Wholesale Diamondbacks Hoodies , billet, rolling and drawing processes is made, and its defects on the slab in addition to a variety of metallurgical defects caused during the forming process, an extension along the circumferential direction of the pipe axis laminar imperfections, but also because of improper processing operation process, drawing die roll or other reasons caused by poorly designed cracks Wholesale Diamondbacks Shirts , folding, warping, scratches or other surface and internal strain on the pipe at each stage of the production process defects. To ensure the quality seamless steel pipe, according to the relevant technical standards, the seamless steel pipe production line is required for surface and internal NDT.?
Eddy current testing is to establish a non-destructive testing methods based on electromagnetic induction, which will probe sinusoidal current excitation coil Wholesale Diamondbacks Jerseys , seamless steel pipe when the probe is close to the surface, alternating magnetic field is generated around the coil induced electromotive force induced in the steel surface current, that eddy currents. The eddy current and the induced magnetic field acting on the coil, thereby changing the electrical parameters of the coil. Eddy current loss resistance passage, and anti-eddy current magnetic flux generated by the coil to the probe and reflected, and phase change of the size of the coil current Cheap Diamondbacks Hats , i.e., the impedance of the coil changes. Moving the probe relative to the surface of the seamless pipe when the defect is encountered, so that the reaction of the eddy current type magnetic field to the coil, causing the coil impedance variation, which measured the amount of change identified this seamless steel surface defects. Eddy current testing is one of the hydrostatic test may be substituted detection methods. Eddy current flaw detection result can be directly output to an electrical signal, easy to automate testing. Non-contact eddy current testing methods Cheap Diamondbacks Hoodies , testing quickly. The basic principle of the magnetic flux leakage testing of seamless steel tubes based on the high-permeability properties of the ferromagnetic material, a ferromagnetic seamless steel is magnetized surface and near surface defects in seamless pipe surface leakage magnetic field , by detecting the change in magnetic field leakage signal can be detected to be defective. Defects in seamless pipe is much less than the permeability of the magnetic permeability of the steel pipe. When seamless steel pipe probe into pipelined line, fast through the detection zone will be subject to a DC coil magnetization transverse and longitudinal magnetic field. If no defects seamless steel pipe, seamless steel pipe by th heap Air Max[/url] Wholesale Nike Air Max Wholesale Max Shoes Wholesale Nike Shoes Shop