Wave beam time-delay control-based helical weld pipe twisting guided wave detection method and device
A technology of spiral welded pipe and time delay control, which is applied to measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves, etc. To achieve the effect of improving the signal-to-noise ratio and improving the identifiability
Active Publication Date: 2015-08-19
HANGZHOU ZHEJIANG UNIV JINGYI ELECTROMECHANICAL TECH ENG
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Since the position of the spiral weld reinforcement projection on the cross-section of the pipe is always changing, at any moment when the ultrasonic guided wave of the cylindrical axisymmetrically distributed wavefront passes through a helical weld with a pitch, the guided wave beam will be welded at that pitch. Reflection occurs at a certain position of the seam, so that the weld signal continues to appear in the echo, resulting in a significant drop in the signal-to-noise ratio of the echo
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[0040] The present invention will be further described below in conjunction with drawings and embodiments.
[0041] Such as figure 1 Shown, the inventive method specifically comprises:
[0042] 1) According to the structural geometric parameters such as the outer diameter and wall thickness of the spiral welded pipe 1 and the material mechanical property parameters such as Young's modulus, Poisson's ratio, and density, the T(0,1) mode guided wave is calculated by semi-analytical finite element method Dispersion characteristics.
[0043] 2) Utilizing the characteristics of the same family of torsion-bending guided wave and T(0,1) mode guided wave, the wave front and the spiral weld 2 are calculated according to the wave velocity of T(0,1) mode guided wave and the helix angle of spiral welded pipe 1 The frequency of the torsional guided wave in parallel, the specific formula is:
[0044] f = nc p T...
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The invention discloses a wave beam time-delay control-based helical weld pipe twisting guided wave detection method and device. The method comprises calculating helical weld pipe guided wave dispersion characteristics by a semi-analytical finite element method, calculating twisting guided wave frequency and a wave rate of a parallel helical weld, arranging multiple magnetostrictive transducers at equal intervals along a circumferential direction to obtain an annular magnetostrictive twisting guided wave transducer array, after time-delay excited guided waves of all channels are transmitted along an axial direction and are reflected by defects, receiving the excited guided waves by all channels of the annular magnetostrictive twisting guided wave transducer array, carrying out synthesis to obtain a detection signal, determining defect positions according defect wave packets, and determining the optimal twisting guided wave detection frequency and a corresponding signal by frequency sweeping according to a signal-to-noise ratio. The method and device eliminate helical weld signal continuous echoing in guided wave detection adopting the annular integrated magnetostrictive tranducer, improve a signal-to-noise ratio of guided wave echoing and realize easy extraction of a small defect signal.
Description
technical field [0001] The invention relates to a non-destructive testing method for welded pipe defects, in particular to a method and device for detecting twisted-bending guided waves of spiral welded pipes based on beam delay control, and belongs to the technical field of non-destructive testing. Background technique [0002] Spiral welded pipe is a kind of steel pipe made by rolling low-carbon carbon structural steel or low-alloy structural steel strip into a tube blank according to a certain helix angle (forming angle), and then welding the pipe seam. Spiral welded pipe has strong pressure bearing capacity, good plasticity, and is convenient for welding and processing. It is mainly used in petrochemical industry, chemical industry, electric power industry and other fields. Spiral welded pipes are often in long-term contact with corrosive media such as oil, gas, and slurry during service, and spiral welded pipes are usually under pressure during work, and defects such as...
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Login to View More IPC IPC(8): G01N29/12G01N29/32
Inventor 唐志峰吕福在张小伟刘军骆苏军李明范
Owner HANGZHOU ZHEJIANG UNIV JINGYI ELECTROMECHANICAL TECH ENG