An ultrasonic stress detection device with adjustable sound beam angle and test area

Abstract

An ultrasonic stress detection device capable of adjusting the sound beam angle and the test area, comprising: a central positioning platform (100); parallel rail frames (200) are fixed on opposite sides of the center positioning table (100); each parallel rail frame (200 ) are slidingly connected to the glass base (300), the upper part of the glass base (300) is a U-shaped groove track (310) with a convex arc guide surface (311), and the probe fixing wedge (400) and the U-shaped groove track The side wall of (310) is slidingly connected, and the concave arc surface of the probe fixing wedge (400) cooperates with the convex arc guide surface (311) of the U-shaped groove rail (310); the upper part of the probe fixing wedge (400) is set There is a probe fixing cavity (500) for fixing the ultrasound probe. The equipment can realize the adjustment and correction of the first critical angle of the weld seam and the heat-affected zone, and the residual stress test of different materials; and the equipment can realize the residual stress test in different areas of the workpiece to be tested.

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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