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Reference block for alloy steel bar ultrasonic flaw detection and using method of reference block

A technology for comparing test blocks and alloy steel bars, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and analysis of materials, etc. and other problems, to achieve the effect of accurate inspection results, saving inspection costs, and accurate defect positioning.

Pending Publication Date: 2019-02-19
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also many irreparable shortcomings in manual flaw detection: first, the flaw detection time is long and the production efficiency is low; second, the flaw detection operation is labor-intensive, which is easy to cause fatigue of personnel; Covering the surface of the steel to be tested will inevitably lead to missed detection and false detection; Fourth, due to the slow speed of flaw detection, manual detection is difficult to adapt to the requirements of modern mass production

Method used

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  • Reference block for alloy steel bar ultrasonic flaw detection and using method of reference block
  • Reference block for alloy steel bar ultrasonic flaw detection and using method of reference block

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The steel grade of the bar to be inspected in this embodiment is 40Cr, the specification is Φ60mm, the alloy composition of the comparison test piece is similar or similar to 40Cr, and the flaw detection sensitivity is Φ3mm.

[0043] S1, select the comparison test block:

[0044] The diameter D of the comparison test block is 60mm, L 3 45mm, L 2 30mm, L 1 15mm. The drilling diameter of the flat-bottomed hole is accurate, and the axis of the hole coincides with the diameter line of the bar, and the surface of the flat-bottomed hole is perpendicular to the axis, and the inside of the hole is clean.

[0045] S2, adjust flaw detection sensitivity:

[0046] Couple the ultrasonic straight probe to the circumferential surface of the comparison test block, find out the C of the C comparison section 3 3 The maximum echo of the flat-bottomed hole 33, adjust the echo amplitude to 80% of the full scale, and then find the A of the comparison section A1 3 The maximum echo of th...

Embodiment 2

[0050] The steel grade of the inspected bar in this example is 35CrMo, the specification is Φ100mm, the alloy composition of the comparison test piece is similar or similar to that of 35CrMo, and the flaw detection sensitivity is Φ2mm.

[0051] S1, select the comparison test block:

[0052] The diameter D of the comparison test block is 100mm, L 3 75mm, L 2 50mm, L 1 is 25mm. The drilling diameter of the flat-bottomed hole is accurate, and the axis of the hole coincides with the diameter line of the bar, and the surface of the flat-bottomed hole is perpendicular to the axis, and the inside of the hole is clean.

[0053] S2, adjust flaw detection sensitivity:

[0054] Couple the ultrasonic straight probe to the circumferential surface of the comparison test block, find out the C of the C comparison section 3 2 The maximum echo of the flat-bottomed hole 32, adjust the echo amplitude to 80% of the full scale, and then find out A vs. A of section 1 2 The maximum echo of the ...

Embodiment 3

[0058] The steel grade of the inspected bar in this example is 12Cr1MoV, the specification is Φ130mm, the alloy composition of the comparison test piece is similar or similar to that of 12Cr1MoV, and the flaw detection sensitivity is Φ1mm

[0059] S1, select the comparison test block:

[0060] The comparison test block specification D is 128mm, L 3 96mm, L 2 64mm, L 1 is 32mm. The drilling diameter of the flat-bottomed hole is accurate, and the axis of the hole coincides with the diameter line of the bar, and the surface of the flat-bottomed hole is perpendicular to the axis, and the inside of the hole is clean.

[0061] S2, adjust flaw detection sensitivity:

[0062] Couple the ultrasonic straight probe to the circumferential surface of the comparison test block, find out the C of the C comparison section 3 1 For the maximum echo of the flat-bottomed hole, adjust the echo amplitude to 80% of the full scale, and then find out A and compare the A of section 1 1 The maximu...

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Abstract

The invention provides a reference block for alloy steel bar ultrasonic flaw detection and a using method of the reference block. The reference block is a cylindrical matrix and comprises three comparison sections with the same diameter in the axial direction of the cylindrical matrix; a straight part is arranged on the circumferential wall of each comparison section; the circumferential wall of each comparison section is composed of the corresponding straight part and an arc part which are connected head to end in the circumferential direction of the circumferential wall; each straight part is a plane axially parallel to the cylindrical matrix; each arc part is a part of the circumferential surface sharing the axis with the matrix; flat bottom holes are formed in the planes of the straight parts; and the axes of the flat bottom holes are perpendicular to the planes of the straight parts, and intersect with the axis of the matrix. The reference block and a to-be-detected bar are similar in material and similar or the same in size, the structure is simple, the preparation cost is low, and flaw detection results are more accurate; and by arranging the three comparison sections for defect positioning, defect positioning is more accurate, the yield of steel is greatly increased, the detection cost is saved, and important significance for defect detection of the bar is achieved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flaw detection, and in particular relates to a comparison test block for ultrasonic flaw detection of alloy steel bars and a use method thereof. Background technique [0002] Ultrasonic flaw detection is a method of inspecting parts defects by using ultrasonic waves to penetrate deep into the metal material and pass from one section to another, and reflect at the edge of the interface to inspect parts defects. Internally, when a defect and the bottom surface of the part are encountered, reflected waves are generated respectively, and a pulse waveform is formed on the fluorescent screen, and the position and size of the defect are judged according to these pulse waveforms. [0003] According to the product inspection standards, the steel must be tested by ultrasonic flaw detection before leaving the factory, and it can only leave the factory after passing the flaw detection test. Once the probe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/30G01N29/04G01N29/07
CPCG01N29/048G01N29/07G01N29/30G01N2291/0234
Inventor 李金浩张佩孙相中王宗斌欧阳峥荣郑桂芸张海霞
Owner SHANDONG IRON & STEEL CO LTD
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