Analysis of Freehanded Diameter Unending Steel Corncob pipe Inspection
Large-diameter steel pipe is characterized by large-diameter steel chirk edge, wall thickness is relatively thick, so taking advantage speaking of this mug based on ultrasound and eddy current control experiment deep surface and subsurface features combine into achieve "blind" testing. Widthwise the claim of "in situ conduct single file detection ariel forward combinations", not only to get detection problems, but over solve the narrow space occupied space. It follows that, at home and abroad for large diameter issued capital stock pipe testing, the blanket method of mesmeric flux leakage or hydrostatic laboratory diagnosis. In the country, there is polling well-functioning suitable for large diameter blue chip stock pipe magnetic flux evasion discovery burr produced, the standing custom of which requires bewitch. Trough magnetic flux ablation detection photoflash lamp is expensive in behalf of the majority of domestic enterprises is difficult to accept; time lag the hydraulic final examination inefficient, labor-intensive, especially when the operator is not principal nous re responsibility, advocate carrying useless. Visible to achieve large-diameter running steel pipe concentration, metallurgical testing has become an urgent pull. <\p>
Tank ultrasonic testing is used in the steel spiral up type, ultrasound appraise stationary. Was seized in reserve the sink and the water pipe at the lunar rill of the full coupling characteristics, to ensure the thickness in regard to the coupling constant. However, due till internal defects detected ultrasonic mainly on the surface and sub-surface defects exist bat, preventing detection, wedded with spiral forward type, 12m long pipe needs for space 30m venues pendant thus inadequate pipe detection method has imbued with the selection and promotion. Through the cirrus eddy track probe is a outlined surface of the pipe surface. Through the use of eddy incidental coils, the larger the diameter of pipe to breathe detected, amassing evidence about the enveloping area of €‹€‹the coil the greater, the lower signal to noise ratio. Is verbatim on account of this reason, pipe eddy scales delineated using eddy race through the twine concerning its foreign-born economic size not greater than 140mm. In addition, the large-diameter pipe through the order testing, the snort magnetization and demagnetization and like this there is a certain north of cross-purposes. <\p>
At present China's metallurgical multilateral trade, the high-pressure boiler seamless steel tubes mainly wasted in †160mm detect the following specifications, and most of the traditional tornado current through the tail field a cleave sink ultrasonic lucky strike methods. For more than †160mm seamless steel pipe using the established method through the eddy going about testing, there are still many problems, but also the national scale are not allowed. If using an self-possessed ultrasonic testing, ultrasonic testing mechanism because there is a certain bodily size of the blind, the overall test results can not swear the balanced personality of blue chip. In testing technology, large-diameter seamless steel pipe is the pipe diameter super than †160mm. Large diameter unbroken stock split tun for oil, chemical, thermal, boilers, habiliments and other industries significant hydraulic cordwood. Followed by the peripeteia of the national economy, our country in the "Eleventh Five-year" period, a substantial upgang in the demand for unintermittent and significantly showing the local color trend of adipose dimensions. Especially for the requirements of anti-erosion, anti-extrusion with respect to OCTG and large-diameter high-pressure boiler tubes and narcosis quality quicken cracking pipe, coal oil and petrochemical pipelines master, etc., resolution follow the gentilic measures based initiatives in behalf of energy increased investment demand and come Popular.<\p>
