Manufacturing method of internal crack defect testing plate for non-destructive testing teaching

An internal crack, non-destructive flaw detection technology, applied in teaching models, educational appliances, scientific instruments, etc., can solve problems such as difficulty in achieving target effects, difficulty in achieving effective results in welding process control, and limited restraint stress, to improve training and replacement. , Enhance the effect of perceptual and rational cognition, flexible and accurate positioning

Active Publication Date: 2020-05-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent for invention with the publication number CN102009280B discloses a welding electrode with welding cracks and its production method, which also forms cracks by increasing the sensitivity of the weld to thermal cracks; the patents with the publication number CN101576450 and CN102009280B are both Cracks are made by increasing the sensitivity of weld thermal cracks. When the welding process parameters and the shape of the molten pool are not controlled properly, it is difficult to achieve the target effect; the patent with the publication number of CN105196002A makes cracks by loading, but the cracks are true to the actual cracks of the weld The patent publication No. CN107020440A discloses a manufacturing method of artificial welding crack defect test plate, which utilizes the brittleness of ball milled cast iron welds to make artificial cracks by means of partial repair welding, and the position and size of the cracks are controlled It is mainly achieved by grinding a groove with a depth of 2-3mm and a width of 3-5mm on the bottom weld; however, the restraint stress of a groove of this size is very limited during repair welding, and cracks caused by repair welding are mainly Relying on the brittleness of the repair welding cast iron weld bead is the key to this invention, and it will be difficult to achieve effective results if the welding process is not properly controlled

Method used

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  • Manufacturing method of internal crack defect testing plate for non-destructive testing teaching
  • Manufacturing method of internal crack defect testing plate for non-destructive testing teaching
  • Manufacturing method of internal crack defect testing plate for non-destructive testing teaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Step 1. Selection of high carbon equivalent welding consumables

[0069] Select the J607R electrode with Ceq=0.461%, and the electrode specification is 3.2mm in diameter;

[0070] Step 2. Defect test board preparation

[0071] Select a low-carbon steel plate with a length of 300mm, a width of 150mm, and a thickness of 30mm as the test plate 1; according to the design crack depth, a double-sided V-shaped groove with a blunt edge is made on the test plate 1, and the angle A of the V-shaped groove is 45°; the blunt edge The height H is 3mm;

[0072] Step 3. Rigid fixation of defective test plate

[0073] Use the rigid fixture 2 and the fastening bolt 3 to assemble the test plate 1 with the processed groove, and the width L of the groove gap is 2mm. After the assembly, tighten the fastening bolt 3 to ensure the effective rigid fixation of the test plate 1 ;

[0074] Step 4, crack making

[0075] Use the J607R electrode with a diameter of 3.2mm and Ceq=0.461% to carry o...

Embodiment 2

[0084] Step 1. Selection of high carbon equivalent welding consumables

[0085] Select the J857CrNi electrode with Ceq=0.708%, and the electrode specification is 3.2mm in diameter;

[0086] Step 2. Defect test board preparation

[0087] Select a low-carbon steel plate with a length of 300mm, a width of 150mm, and a thickness of 30mm as the test plate 1; according to the design crack depth, a double-sided V-shaped groove with a blunt edge is made on the test plate 1, and the angle A of the V-shaped groove is 50° ;The blunt edge height H is 4mm;

[0088] Step 3. Rigid fixation of the test plate

[0089] Use the rigid fixture 2 and the fastening bolt 3 to assemble the processed V-groove test plate 1, wherein the gap width L of the V-shaped groove is 3mm. After the assembly, tighten the fastening bolt 3 to ensure that the test plate Effective rigid fixation of 1;

[0090] Step 4, crack making

[0091] Use the J857CrNi electrode with a diameter of 3.2mm and Ceq=0.708% to weld ...

Embodiment 3

[0100] Step 1. Selection of high carbon equivalent welding consumables

[0101] Select the J107Cr electrode with Ceq=0.942%, and the electrode specification is 4.0mm in diameter;

[0102] Step 2. Defect test board preparation

[0103]Select a low-carbon steel plate with a length of 300mm, a width of 150mm, and a thickness of 30mm as the test plate 1; according to the design crack depth, a double-sided V-shaped groove with a blunt edge is made on the test plate 1, and the angle A of the V-shaped groove is 60°; the blunt edge The height H is 5mm;

[0104] Step 3. Rigid fixation of defective test plate

[0105] Use the rigid fixture 2 and the fastening bolt 3 to assemble the processed V-groove test plate 1, wherein the groove gap L is 4mm. After the assembly, tighten the fastening bolt 3 to ensure the effective performance of the test plate 1. rigidly fixed;

[0106] Step 4, crack making

[0107] Use the J107Cr electrode with a diameter of 4.0mm of Ceq=0.942% to weld the des...

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Abstract

The invention discloses a manufacturing method of an internal crack defect testing plate for non-destructive testing teaching. The manufacturing method comprises the steps that the welded joint cold crack generation mechanism in the welding process is utilized, the high-constraint testing plate butt joint mode is adopted, a high-carbon-equivalent welding material is utilized, normal-temperature welding is conducted and supplemented by application of the forced rapid cooling measure after welding is accomplished, a product is placed for 24 hours, and therefore a welded joint internal crack which meets the requirements for the designed crack position, the depth and the length can be formed; and then a clamp and a testing plate point fixation are disassembled, bottoming welding is conducted in the region without the designed crack, a defect testing plate is filled and subjected to face covering welding, finally the welded joint surface cleaning is conducted, and the manufacture of the testing plate is accomplished. The welded joint internal crack formed according to the manufacturing method is different from the artificial defect in a common non-destructive testing standard testing plate, the crack defect is real, and the method is feasible, can be used for conducting non-destructive testing such as ultrasonic non-destructive testing, and training and examining non-destructive testing personnel, and has the important significance in enhancing the understanding of the non-destructive testing personnel for crack defect detection signals. The manufacturing method of the internalcrack defect testing plate for non-destructive testing teaching has the advantages of being flexible and accurate in locating, meeting the requirement of actual teaching and training and being broad in application range.

Description

technical field [0001] The invention belongs to the technical field of non-destructive flaw detection of metal materials, and relates to a method for manufacturing a crack defect test plate for teaching or non-destructive flaw detection training, in particular to a method for manufacturing an internal crack defect test plate for non-destructive flaw detection teaching. Background technique [0002] Non-destructive testing is an emerging comprehensive applied technical discipline, which is a discipline that measures and evaluates various defects inside or outside the material without destroying or damaging the object to be inspected; the common defect test board is a non-destructive testing teaching and personnel It is a necessary test piece in the process of training, assessment, etc.; the welded joint is a kind of heterogeneous chemical composition, which is a key part that affects product quality and use safety, and is also the "hardest hit area" for defects in the product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00G01N29/04G01N29/22G09B25/00
CPCB23P15/00G01N29/043G01N29/22G09B25/00G01N2291/0234
Inventor 牛靖张恩涛廉张剑李盛殷咸青张建勋周哲
Owner XI AN JIAOTONG UNIV
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