URP350 flaw detection machine long water column correction method

Abstract

The invention discloses a URP350 flaw detection machine long water column correction method. The correction method includes the following steps that firstly, a water column type probe block assembly 60 mm long is selected and used, so that the acoustic length in water between a probe and a steel tube becomes 60 mm; secondly, the screw pitch is controlled so as to meet the requirement that flaw detection speed is equal to the value obtained by multiplying the screw pitch by the rotation speed of a rotary head; thirdly, the water pressure of the probe is adjusted to be 3-3.5 bar, and the water pressure of a bearing is adjusted to 3-3.5 bar; fourthly, a quantitative adjusting mode is adopted, and a probe arm unit is adjusted; fifthly, according to the probe distribution rule, a grouped scratch operation mode is adopted; sixthly, ultrasonic pulse transmission delay time is adjusted. By the adoption of the method, about millions of economic benefits can be directly created every year. Besides, by means of the operation method, adjusting time for replacing specifications and equipment of thick-wall tubes and steel tubes in non-conventional specifications can be controlled within 60 min. The correction time of the thick-wall tubes and the steel tubes in non-conventional specifications can be controlled within 3 hours, non-production time is greatly shortened, and conditions are created for yield increase.

Description

technical field [0001] The invention relates to the technical field of flaw detection of seamless steel pipes, in particular to a water column proofreading method of a URP350 flaw detector. Background technique [0002] The URP350S super-detector adopts the water immersion shear wave method for flaw detection in the longitudinal and transverse directions. The longitudinal wave passes through the water layer and is refracted on the water-steel interface to form a refracted shear wave in the steel pipe for flaw detection. The ultrasonic flaw detection unit assembly of URP350S is composed of probe arm and probe block. There are 4 probe arm assemblies in the rotating head, such as figure 2 shown. The front end of the probe arm assembly is equipped with water column contact shoe probe blocks, and these probe blocks are equipped with ultrasonic sensors (up to 36 in total); during flaw detection, these unit devices rotate around the steel pipe, and the counterweight on each crank ...

AI Technical Summary

Problems solved by technology

[0007] 3. The wall thickness is large, and the ultrasonic signal attenuation is large;

[0008] 4. The thick-walled pipe has a large curvature, especially at the end of the pipe;

[0009] 5. Due to the absence of matching wear-resistant boots and sleeves for unconventional specifications, the flaw detection unit is not in close contact with the pipe, resulting in poor flaw detection signals

Images