Ultrasonic-wave stress detection device capable of adjusting acoustic beam angle and test area

Abstract

Provided is an ultrasonic-wave stress detection device capable of adjusting an acoustic beam angle and a test area. The detection device comprises a center positioning bench (100). Parallel guide rail racks (200) are fixed on opposite side faces of the center positioning bench (100) and are slidably connected with a glass pedestal (300). A U-type groove rail (310) with a protruding arc guide rail face (311) is arranged on the upper part of the glass pedestal (300). A probe fixing wedge (400) is slidably connected with the side wall of the U-type groove rail (310). The recessed arc face of the probe fixing wedge (400) cooperates with the protruding arc guide rail face (311) of the U-type groove rail (310). A probe fixing cavity (500) used for fixing an ultrasonic-wave probe is arranged on the upper part of the probe fixing cavity (500). According to the invention, adjustment and correction of first critical angles of a welded seam and of a heat affected zone and residual stress tests for different kinds of materials can be achieved; and residual stress tests of to-be-tested workpieces in different areas of regions can be achieved.

Description

technical field [0001] The invention relates to an ultrasonic stress detection device capable of adjusting the sound beam angle and the testing area, and belongs to the field of residual stress testing. Background technique [0002] Residual stress is generated when the material undergoes plastic deformation under the action of external force, while elastic deformation does not generate residual stress. Residual stress is a main criterion for workpiece quality evaluation, which has great harm to the service of the workpiece, such as accelerating the initiation of fatigue cracks, reducing fatigue life, stress corrosion, deformation, instability, etc., so the significance of nondestructive testing for residual stress is relatively large big. [0003] Ultrasound uses the principle of acoustoelasticity to test the residual stress. The principle of acoustoelasticity refers to the linear relationship between the propagation speed of ultrasonic waves and the stress in the workpiec...

AI Technical Summary

Problems solved by technology

This fixed inclination angle is the first critical angle calculated based on the base metal test of the welded workpiece to be tested, and there is a large difference between the weld seam, the heat-affected zone and the structure of the base metal; therefore, the first critical angle also has a large difference. There is a big difference, there must be a large measurement error with the first critical angle calculated based on the base metal to test the residual stress of the weld and the heat-affected zone

Moreover, the evaluation of residual stress is usually performed on two directions (parallel to the direction of the weld and perpendicular to the direction of the weld), while the existing ultrasonic residual stress testing equipment can only test one direction of the workpiece (parallel to the direction of the weld) at a time. Or perpendicular to the direction of the weld) for residual stress testing, when changing to another direction, it is easy to cause inconsistencies in the positions of the front and rear tests or non-vertical directions, resulting in large test errors

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