Water immersion ultrasonic flaw detection method for rolled steel defects

An ultrasonic and water immersion technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and material analysis, etc. The effect is not very ideal, etc., to achieve the effect of enhancing the scanning signal and accurate detection results

Active Publication Date: 2018-11-13
合肥亿米特科技股份有限公司
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the signal strength of water immersion ultrasonic testing is very weak, and it is often necessary to adjust the gain of the attenuator to a high level to find the defect echo in the workpiece. According to experimental research, when using the same probe, the signal strength of water immersion ultrasonic testing is the same as that of The signal strength difference of the water grinding method is about 20dB
Therefore, focusing probes are generally used to increase signal strength in water immersion testing. Although this method can increase signal strength to a certain extent, the actual detection effect is not very ideal due to the uneven distribution of the sound beam of the focusing probe.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water immersion ultrasonic flaw detection method for rolled steel defects
  • Water immersion ultrasonic flaw detection method for rolled steel defects
  • Water immersion ultrasonic flaw detection method for rolled steel defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] A company produced a Q235 rolled steel plate with a thickness of 25mm. Through online inspection, it was found that there was a defect in a certain section of the steel plate, and the depth of the defect was at 18mm. Now cut the defect into a sample of 100×100×25mm, use the experimental device in this invention to test the sample, and compare the results with the traditional single-probe water immersion testing method. The test results of the two methods are as follows:

[0041]Through single-focus probe water immersion detection, the water layer distance is generally adjusted to about a quarter of the workpiece thickness. Here, a water immersion focus probe with a focal length of 80mm in water, a frequency of 5MHz, and a chip diameter of 14mm is used. The thickness of the water layer is set to 7mm, find the defect position in the sample by scanning, when the defect wave height is 80% of the full screen height, the attenuator gain of the instrument is 53dB. Obtain the A...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a water immersion ultrasonic flaw detection method for rolled steel defects, and belongs to the technical field of water immersion ultrasonic nondestructive detection. The thicknesses of water layers of all focus probes are different; the focus probes are fixed on a water immersion ultrasonic flaw detector by fixtures, a plurality of focus probes are controlled to move together by software, each focus probe can be guaranteed to scan a scanning area of to-be-tested rolled steel once, the scanned results of all the focus probes are displayed on a computer separately, thenthe scanned results of all the focus probes are synthesized, and whether the to-be-tested rolled steel has defects can be analyzed more accurately. Because focus points of all the focus probes are distributed in the thickness direction of the to-be-tested rolled steel and signals near the focus points are much stronger than signals at other positions of a sound beam, the scanning signals of the focus probes can be effectively enhanced by the method and the detection results are more accurate.

Description

Technical field: [0001] The invention belongs to the technical field of water immersion ultrasonic nondestructive testing, and in particular relates to a water immersion ultrasonic flaw detection method for defects in rolled steel products. Background technique: [0002] Ultrasonic non-destructive testing technology began in the 1930s and has achieved rapid development since its development. It has been applied to almost all industrial fields and plays an important role in domestic economic development and construction. At present, ultrasonic non-destructive testing technology is the most widely used, most frequently used and fastest-growing non-destructive testing technology at home and abroad. [0003] Ultrasonic flaw detection of steel is a more commonly used method to detect the quality of steel. Compared with other detection methods, ultrasonic flaw detection has many advantages, such as: it can detect without damaging the workpiece, no pollution, harmless to the human ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06
CPCG01N29/069G01N2291/0234
Inventor 钱健清柯彤邹军石刚
Owner 合肥亿米特科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products