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T-shaped welded joint TOFD detection reference block and detection method

A technology for welding joints and comparison test blocks, which is used in measurement devices, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc., can solve the problems of poor detection sensitivity, cumbersome detection process, and low detection efficiency, and achieve reliable data. and help, avoid hidden dangers, the effect of high defect detection rate

Active Publication Date: 2021-10-08
CHINA RAILWAY SHANQIAO GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection process is relatively cumbersome, the detection efficiency is low, and the practical experience of the testing personnel is high.
Although GB / T 3323-2005 specifies the transillumination method for diagonal (T-type) joints (refer to figure 2 ), but its thickness difference is large, resulting in a large difference in the blackness of the film, and the change in thickness leads to an increase in the scattering ratio, resulting in edge erosion effects, geometric unsharpness and scattering ratios are different, and the image quality and defect detection sensitivity are relatively low. Difference

Method used

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  • T-shaped welded joint TOFD detection reference block and detection method
  • T-shaped welded joint TOFD detection reference block and detection method
  • T-shaped welded joint TOFD detection reference block and detection method

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Embodiment 1

[0018] The invention discloses a T-shaped welded joint TOFD detection comparison test block, which has the same structure and thickness as the workpiece to be tested, and is located 4 mm away from the surface of the weld seam on both sides and the connection line of the lower welding toe and the connection line of the lower welding toe of the two sides of the welding seam. A through hole with a diameter of 2mm is opened at the intersection point with the center of the weld, such as image 3 shown. The positions of the through holes are set at the most unfavorable positions for generating diffraction signals.

Embodiment 2

[0020] The invention discloses a T-shaped welded joint TOFD detection method based on the T-shaped welded joint TOFD detection comparison test block disclosed in Embodiment 1.

[0021] 1. Before the test, measure the -12dB sound beam spread angle of the combination of the instrument and the probe, and make sure that the probe can completely cover the entire T-shaped welded joint during the test. If not, a probe with a larger refraction angle should be selected.

[0022] 2. Place a probe on both sides of the detection surface (refer to image 3 ), move the probe position so that the beam intersection of the probe pair is located at 2 / 3(t 1 +h+10), where t 1 is the thickness of the wing plate, h is the height of the welding angle, and at the same time, ensure that the distance PCS between the probe pair is 4 / 3(t 1 +h+10)×tanβ, where β is the refraction angle of the probe, and 10 (in mm) represents the width of the heat-affected zone of the weld, such as Figure 4 shown.

[0...

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Abstract

The invention provides a T-shaped welded joint TOFD detection reference block which is the same as a workpiece to be detected in structure and thickness, and through holes with the diameter of 2 mm are formed in the positions, 4 mm away from the connecting line of the surfaces of weld joints on the two sides and lower weld toes, of the connecting line of the lower weld toes of the weld joints on the two sides and the intersection point of the centers of the weld joints respectively. According to the T-shaped welded joint TOFD detection method based on the T-shaped welded joint TOFD detection reference block, before detection, the -12dB acoustic beam spread angle of an instrument and probe combination is measured, it is ensured that the probes can completely cover the whole T-shaped welded joint during detection, the probes are placed on the two sides of the detection face respectively, and the probes are moved so that the acoustic beam intersection point of the probe pair can be located at the 2 / 3 (t1 + h + 10) position, wherein t1 is the thickness of the wing plate, h is the height of the weld fillet, meanwhile, it is guaranteed that the distance between the probe pairs is 4 / 3 (t1 + h + 10) * tan beta, and beta is the refraction angle of the probe.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection of welded joints, in particular to a T-shaped welded joint TOFD detection comparison test block and a detection method. Background technique [0002] In the manufacturing process of steel bridges and steel structures, T-shaped welded joints, full penetration welded joints or partial penetration welded joints are often used. This type of welded joint is an important stress-bearing part of steel bridges and steel structures. Strengthening the welding quality process control of this type of welded joints can not only ensure the detection of harmful defects in welded joints, but also provide reliable data and help for welding technicians to correct unreasonable welding processes in time. More importantly, it can Guarantee the safety and durability of the construction and use of steel bridges and steel structures. [0003] At present, T-shaped welded joints are basically ultrasonically...

Claims

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Application Information

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IPC IPC(8): G01N29/30
CPCG01N29/30G01N2291/0234
Inventor 刘妹张力华畅三军李丹
Owner CHINA RAILWAY SHANQIAO GRP CO LTD