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Method for measuring the width of laser lapping welding seam by using reflected echo of S0 mode lamb wave

A technique for overlapping welds and measuring methods, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of Lamb wave dispersion, complex signals, and unfavorable defect identification and positioning

Active Publication Date: 2015-08-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

In the presence of multiple modes, the signal after Lamb wave and defect is very complex, which is not conducive to defect identification and location
Second, the phase velocity and group velocity of the Lamb wave change with the frequency, resulting in the dispersion phenomenon of the Lamb wave
That is, the Lamb wave increases with the propagation distance, and the wave packet and energy of the Lamb wave diffuse, resulting in a decrease in the intelligibility of the Lamb wave signal

Method used

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  • Method for measuring the width of laser lapping welding seam by using reflected echo of S0 mode lamb wave
  • Method for measuring the width of laser lapping welding seam by using reflected echo of S0 mode lamb wave
  • Method for measuring the width of laser lapping welding seam by using reflected echo of S0 mode lamb wave

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Embodiment

[0034]To detect lap welds formed by laser welding of two 2mm thick 304 stainless steel plates (such as figure 1 , laser lap welding seam model) as an example to illustrate the method of measuring the width of laser lap welding seam with S0 mode Lamb wave.

[0035] Step 1): draw the dispersion curve of 2mm thick 304 stainless steel plate;

[0036] First, according to material parameters: density ρ=8000kg / m 3 , elastic modulus E = 193GPa, Poisson's ratio v = 0.29, to calculate the longitudinal wave velocity of the ultrasonic wave. The calculation formula is: Where λ=vE / [(1+v)(1-2v)], μ=E / 2(1+v) is the Lame coefficient of the material. The dispersion curve is obtained by numerical calculation based on the formula derived from viktolov theory, and the dispersion curve of the 2mm thick 304 stainless steel plate is obtained as follows figure 2 , 3 shown.

[0037] Step 2): Establish the detection frequency of Lamb wave;

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Abstract

To meet the need of rapidly measuring the width of a laser lapping welding seam, the invention provides a method for measuring the width of a laser lapping welding seam. The method is characterized in that the width of a laser lapping welding seam is measured by using the amplitude of reflected echo of an S0 mode lamb wave on the laser lapping welding seam based on the linear relationship between the coefficient of reflection of the S0 mode lamb wave on the laser lapping welding seam and the width of the welding seam. The method is highly reliable within a certain error range.

Description

technical field [0001] The invention belongs to the field of ultrasonic nondestructive testing, and in particular provides a method for measuring the width of laser lap welds by using S0 mode Lamb wave reflection echo, which is suitable for large-scale equipment such as transportation, aerospace, shipbuilding, and chemical storage tanks. Non-destructive testing of thin-plate laser lap weld structures. Background technique [0002] Thin-plate structures are widely used in large-scale chemical equipment, transportation carriage bodies, and aerospace devices. For the welding of these thin sheet structures, laser lap welding is a good choice. For example, in rail transit, the car body of some types of trains uses laser lap welding. Because the quality of laser welding seam directly affects the operation safety of passenger cars, it is necessary to carry out safety evaluation on it. Through Kaitanov and other relevant personnel's research on the mechanical properties of laser ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/00
CPCG01B17/00
Inventor 蔡桂喜李阳徐彩云李经明周庆祥冯玮董瑞琪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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