Disclosed is a twin-robot testing apparatus for non-destructive testing. The apparatus comprises two robots (1) for detecting a workpiece (3) from front and back sides thereof; a water circulating unit, comprising a pressure pump, two water ejection coupling probes (2) and water pipes, for providing a coupled water column; an ultrasonic transmitting/receiving device, comprising two ultrasonic transducers, a pulse transmitting/receiving card, and a high-speed data acquisition card, wherein the two ultrasonic transducers are respectively attached at the end-effector of the two robots (1), for transmitting ultrasound and receiving ultrasound respectively, the ultrasonic pulse transmitting/receiving card and the high-speed data acquisition card are mounted on the robot controller mechanism for transmitting and receiving, and acquiring pulse signals, the two robots perform a synchronous transmission testing, with ultrasound transmitted by one robot being received by the other robot, and the ultrasonic transducers are adjusted in position and gesture with the change in the surface shape of the workpiece (3) such that the incidence direction of ultrasonic beam is always in coincidence with the normal direction of the curved surface. The apparatus is used for automatic non-destructive testing of a curved-surface workpiece made of a composite material, and can improve the accuracy, sensitivity and efficiency of the testing.

Dual Robot Detection Apparatus For Non-Damage Detection

The invention belongs to the field of nondestructive detection and relates to a method for nondestructive evaluation of residual stress levels in an aluminum alloy forged piece through ultrasonic waves According to the method, the phenomenon that the propagation speed of the ultrasonic waves in materials can be affected by stress in the materials to a certain extent is used, and the difference of residual stress levels among different positions in the large size aluminum alloy forged piece is reflected through changes of sound speeds The method has the advantages of being high in detection speed, large in measuring depth, good in economy and the like The residual stress in the large size aluminum alloy forged piece is measured through the sound elastic effect of the ultrasonic waves in the method, and the method has the advantages of being high in measuring speed, convenient to use, flexible in measuring range, good in economy and the like The single-time measuring time of the method is about five minutes and is shorter that the single-time measuring time of a neutron diffraction residual stress measuring method, the detection speed is high, the maximum measuring depth of the method can reach 400 mm, is larger that the measuring depth of the neutron diffraction method, and is much larger that the measuring depth of an X-ray method or a Barkhausen noise method

Method for nondestructive evaluation of residual stress levels in aluminum alloy forged piece through ultrasonic waves

The invention relates to an ultrasonic non-destructive testing method for circumferential and axial residual stresses of inner and outer roller paths of a roller bearing. Ultrasonic longitudinal waves form critical refraction longitudinal waves in the inner and outer roller paths of the roller bearing through primary waveform conversion; time spent on that the critical refraction longitudinal waves propagate in the inner and outer roller paths of the roller bearing is measured; the mean circumferential and axial residual stresses of the inner and outer roller paths of the corresponding roller bearing can be calculated according to an acoustic elasticity theory. Furthermore, the distribution of the circumferential and axial residual stresses of the inner and outer roller paths of the roller bearing under different depths further can be measured by changing the frequency of the ultrasonic longitudinal waves. With the adoption of the ultrasonic non-destructive testing method provided by the invention, the problem of rapidly, conveniently and accurately detecting the distribution of the residual stresses of the inner roller and outer roller of the roller bearing can be effectively solved. The ultrasonic non-destructive testing method is widely applied to bearing production, repairing and maintenance sites, is a novel method of detecting the distribution of the residual stresses of a curve component within a narrow space, and has a very wide application range.

Ultrasonic non-destructive testing method for residual stress of inner and outer roller paths of roller bearing

The invention provides device and method for monitoring rail stress based on ultrasonic guided wave. The rail is of an I-shaped structure and equipped with a top, a bottom and a waist part, wherein the waist part is located between the top and the bottom. The method comprises the steps of (1) mounting a guided wave exciting source on the surface of the waist part of the rail, mounting at least one guided wave receiver on the rail and separating from the guided wave exciting source to receive the guided wave from the guided wave exciting source; (2) emitting the guided wave being 20 to 60kHz in frequency through the guided wave exciting source from the surface which is roughly vertical to the mounting position; (3) measuring the spreading speed of the guided wave in the rail; (4) determining the stress in the rail under the guided wave spreading path according to the measured spreading speed. The method has the beneficial effects that the temperature stress of a seamless line rail is monitored online on real time, so that the stress exceeding the area can be early warned on real time, and as a result, the safety operation of the seamless line can be ensured.

Device and method for monitoring rail stress based on ultrasonic guided-wave

The invention relates to a surface residual stress ultrasonic detection method capable of achieving direct coupling wave generation, and belongs to the technical filed of ultrasonic detection. According to the method, a wave generation mode of coupling agent direct coupling is adopted, ultrasonic waves pass through a single coupling agent medium and directly emit into a measured material, and an adopted direct coupling wave generation ultrasonic probe is in a one-emitting double-receiving stress measurement mode. Firstly, the direct coupling wave generation ultrasonic probe is designed and assembled, the assembled direct coupling wave generation ultrasonic probe is placed on the surface of the measured material, and the measurement cardinal plane is kept in full contact with the surface. A coupling agent is stably injected into a coupling agent cavity from a valve opening, an ultrasonic wave direct spreading passageway is formed, and surface residual stress ultrasonic detection is carried out. According to the method, wave generation and coupling are completed at the same time, fewer ultrasonic wave spreading interfaces exist, the quality of received signals is guaranteed, and the signal to noise ratio is increased. According to the adopted stress measurement mode, transit time difference calculation precision is guaranteed, and the measurement spatial resolution is improved.

Surface residual stress ultrasonic detection method capable of achieving direct coupling wave generation

The invention relates to a curved-surface steel plate residual stress ultrasonic detection transceiver device. The device comprises an organic glass wedge, an ultrasonic transducer, and a magnetic base. A sensor device has a one-transmitting and one-receiving structure. Two devices adopt the magnetic base for ensuring the close contact and coupling of the sensor and a test sample. Because of the influence of curvature, incidence angles of point of a sound beam are different. According to the invention, the problems of organic glass curvature and ultrasonic incident angle are explained during a design process. The design idea provided by the invention is innovative. With the device provided by the invention, a difficulty of pipe stress detection is well solved, and a good application prospect is provided.

Curved-surface steel plate residual stress ultrasonic detection transceiver device

The invention aims to provide an acoustic surface wave high-order nonlinear parameter representation method for a bending fatigue state of a metal plate, and the method is used for detecting the bending fatigue state of the metal plate in real time and predicting the bending fatigue life of the metal plate and is widely applied to the fields of aerospace, machinery, traffic, chemical engineering, water conservancy and the like. The method comprises the following steps: determining parameters of an excitation signal according to the surface wave transmission distance and the acoustic velocity of a detected material; emitting a pulse string signal by a high-power ultrasonic transceiver, enabling ultrasonic wave beam to be obliquely incident to the material to generate surface waves, and interacting the surface waves with fatigue defects such as microdefects, micro-plastic deformation or microcracks generated in a bending fatigue process to generate a higher harmonic signal; recording the change of nonlinear parameters every a fixed cycle in a bending fatigue test process, comparing with a standard curve, judging whether a test piece has defects or not, emitting an early warning signal, and predicting the residual bending fatigue life of the metal plate.

Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate

The invention relates to a contact type ultrasonic non-destructive testing straight-line automatic scanning device. The device is mainly used for automatically detecting a straight-line welding line defect and welding residual stress. A magnetic type base can be used for conveniently adsorbing a detection device on a welding line region to be detected; a transverse beam of the detection device is formed by a motor and a straight-line guide rail; the motor drives a slide block for mounting a detection sensor to move along the straight-line guide rail; the sensor can be a residual stress detection sensor, a TOFD (Time Of Flight Diffraction) detection sensor and a surface defect detection sensor; and detected position information is recorded and fed back by a photoelectric encoder. The device can be applicable to automatic detection on the welding line region of a plate type welding component, can realize the automatic detection on a welding line of a curve-surface welding component including a pipeline and the like, and improves the detection efficiency.

Contact type ultrasonic non-destructive testing straight-line automatic scanning device

The invention relates to a device for detecting residual stress close to surfaces of metal materials The device stimulates a critical-refraction longitudinal wave and calculates a stress value according to an acoustic elasticity theory According to the invention, by reducing contact area between a wedge and a part to be measured, the affect of plate surface distortion to a measurement result can be effectively eliminated; the affect caused by temperature difference can be eliminated by temperature compensation; and therefore, the system is adaptable to tests in more terrible field environments The system is higher in integration degree, small and exquisite in appearance and convenient to carry

Device for detecting residual stress close to surfaces of metal materials

The invention relates to a high energy ultrasonic field regulation and control method for residual stress. The method is based on the substance of the process of eliminating the residual stress, and mainly utilizes the granule fluctuation energy of the high energy sound wave to offer enough power for dislocation atoms, so that the dislocation atoms can overcome the resistance and reduce lattice distortion by sliding out of the interior of a crystal so as to eliminate the residual stress. According to the method, a formula of the high energy ultrasonic for offering energy for the material is provided, so that a method for selecting a high energy ultrasonic transducer is provided, and the high energy ultrasonic field of the residual stress of metal or nonmetal components is regulated and controlled. According to the method, the processes are simple, effects of the residual stress at the present stage on the usage, stability of the size, the fatigue strength, abrasive resistance and stress corrosion cracking and the like of the component are effectively eliminated, the method has the advantages of high efficiency, energy conservation, environment friendliness and the like, thus having wide application range.

Song Wentao

Papers

Curved-surface steel plate residual stress ultrasonic detection transceiver device

Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate

Contact type ultrasonic non-destructive testing straight-line automatic scanning device

Device for detecting residual stress close to surfaces of metal materials

High energy ultrasonic field regulation and control method for residual stress