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Method for detecting flaw of angle steel member by using ultrasonic guided waves

A technology of ultrasonic guided wave and angle steel parts, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc. It can solve the problems of low efficiency and achieve the effect of high detection efficiency and low detection cost

Inactive Publication Date: 2012-07-25
江苏省特种设备安全监督检验研究院镇江分院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent with the application number of 200910068160.9 provides an ultrasonic guided wave inspection method for the angle steel of the electric power tower in service. Detect problems, but need to make a comparison test block, the efficiency is relatively low

Method used

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  • Method for detecting flaw of angle steel member by using ultrasonic guided waves
  • Method for detecting flaw of angle steel member by using ultrasonic guided waves
  • Method for detecting flaw of angle steel member by using ultrasonic guided waves

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Effect test

Embodiment 1

[0027] Such as figure 1 , image 3 and Figure 4 As shown, this embodiment uses 5# angle steel (50mm×50mm×3mm) as the detection object, including the following steps:

[0028] 1) According to the thickness of 5# angle steel side plate (3mm), width (50mm), length 1m, material density 7.85g / cm 3 , modulus of elasticity 2.06×10 11 N / m 3 , Poisson's ratio 0.3, longitudinal wave velocity 5960m / s and shear wave velocity 3260m / s establish the finite element model of angle steel piece 1.

[0029] 2) Simulate the propagation process of the ultrasonic guided wave excited by the sensor on the finite element model of the angle steel piece 1, obtain the group velocity of the ultrasonic guided wave propagation of a specific mode at a specific frequency, and establish a database of excitation frequency and modal wave velocity. When the excitation frequency is 70KHZ, the propagation speed of its waveform is 5120m / s.

[0030] 3) Taking the excitation conditions simulated by the fini...

Embodiment 2

[0035] Such as figure 2 As shown, the 6 detection sensors 2 of this embodiment are evenly arranged in groups of 3 on the end faces of the "L"-shaped two side plates of the angle steel piece through special fixtures. The piezoelectric sensor used in this embodiment is a straight probe type, and the remaining steps Same as Embodiment 1.

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Abstract

The invention discloses a method for detecting a flaw of an angle steel member by using ultrasonic guided waves. The method comprises the following steps of: (1) establishing a finite element model of the angle steel member according to the external dimension, the mechanical property and the wave velocity of the angle steel member; (2) simulating the propagation process of the ultrasonic guided waves excited by a plurality of detection sensors on the finite element model; (3) arranging the detection sensors on the angle steel member; (4) exciting the ultrasonic guided waves which generate echoes in the angle steel member when the ultrasonic guided waves encounter the flaw in a special mode through a manner that pulse wave signals generated by an arbitrary function generator pass through a power amplifier, a change-over switch and the detection sensors, and obtaining the waveform chart of echo signals through a manner that the echo signals pass through the detection sensors, the change-over switch and an oscilloscope; and (5) calculating to obtain the position x of the flaw of the angle steel member in the length direction. According to the method for detecting the flaw of the angle steel member by using the ultrasonic guided waves, the detection is carried out through exciting the ultrasonic guided waves at one end of the angle steel member and receiving the flaw echoes and is convenient and fast, the detection cost is low, and the comprehensive detection on the angle steel member can be realized.

Description

technical field [0001] The invention relates to a method for nondestructive testing of section steel, in particular to a method for detecting butt joint angle steel bodies and welding defects with ultrasonic guided waves, and belongs to the technical field of nondestructive testing. Background technique [0002] Steel structures are widely used in construction, roads and bridges, chemical equipment, power station equipment, shipbuilding and marine engineering. Angle steel welded structural parts are very common in steel structures. The butt welding of two angle steels is the most common angle steel welded structural parts. Welding defects such as cracks, lack of fusion, pores and undercuts will appear at the butt welds. In addition, defects such as internal cracks, delamination and folding that occur in the angle steel during the rolling forming process will greatly shorten the existence of these defects. The service life of the angle steel parts may even cause a sudden frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 郭镇宁严有琪姜银方徐瑞峰雷玉兰骆斌
Owner 江苏省特种设备安全监督检验研究院镇江分院
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