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Visual non-corrosion detection method for quickly and accurately judging characteristics of welding area

A welding area and detection method technology, applied in the field of visual non-corrosion detection, can solve the problems of heterogeneous joint corrosion, tissue misjudgment, misjudgment, etc., and achieve the effect of avoiding misjudgment and high accuracy

Pending Publication Date: 2022-08-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can accurately judge heterogeneous materials with obviously different surface texture characteristics, but for heterogeneous materials with similar surface characteristics, this method is extremely prone to misjudgment as the same material
In addition, during sample preparation, water-soluble abrasive paste will cause corrosion to heterogeneous joints, and this corrosion will also cause tissue misjudgment, which will seriously affect the entire subsequent analysis process

Method used

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  • Visual non-corrosion detection method for quickly and accurately judging characteristics of welding area
  • Visual non-corrosion detection method for quickly and accurately judging characteristics of welding area
  • Visual non-corrosion detection method for quickly and accurately judging characteristics of welding area

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Embodiment 1

[0020] This embodiment provides a visual non-corrosion detection method for quickly and accurately judging the characteristics of the welding area. The process is as follows figure 1 shown, including the following steps:

[0021] Step 1. Cutting: Cut the welded joint made of Al alloy and Mg alloy of 5 mm thick sheet into a sample of suitable size, and mount it; when cutting and mounting, keep the vertical surface of the core of the welded joint.

[0022] Step 2. Grinding: Rough grinding and fine grinding are performed on the sample in sequence, and both are cleaned after rough grinding and fine grinding. It is strictly required that water or aqueous solution can not be used in each step of cleaning, only a hair dryer or alcohol can be used. Specifically, the rough grinding method is to use 50-mesh sandpaper to dry-grind the sample, and the fine-grinding method is to use 100, 200, 500, 800, 1000-grit sandpaper to dry-grind the sample in sequence until the surface of the sample ...

Embodiment 2

[0026] This embodiment provides a visual non-corrosion detection method for quickly and accurately judging the characteristics of the welding area. The process is as follows figure 1 shown, including the following steps:

[0027] Step 1. Cutting: Cut the welded joints made of 8mm TRIP steel plates by spot welding together into a sample of suitable size, and mount them; when cutting and mounting, keep the vertical surface of the core of the welded joint.

[0028] Step 2. Grinding: Rough grinding and fine grinding are performed on the sample in sequence, and both are cleaned after rough grinding and fine grinding. It is strictly required that water or aqueous solution can not be used in each step of cleaning, only a hair dryer or alcohol can be used. Specifically, the rough grinding method is to use 50-mesh sandpaper to dry-grind the sample, and the fine-grinding method is to use 100, 200, 500, 800, 1000-grit sandpaper to dry-grind the sample in sequence until the surface of the...

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Abstract

The invention discloses a visual non-corrosion detection method for rapidly and accurately judging welding area characteristics. The visual non-corrosion detection method comprises the following steps: step 1, cutting and embedding; 2, the sample is subjected to rough grinding and accurate grinding in sequence, and a blower or alcohol is adopted during cleaning; thirdly, the sample obtained after fine grinding is polished; firstly, metallographic phase water-soluble abrasive paste is adopted for sample polishing, the surface of a sample is observed, and evidence is obtained; then the step 2 is repeated to grind the sample, the surface of the sample is ground off by 2 mm, then industrial alcohol / pure aluminum oxide polishing powder with the purity of 99.9% is adopted for sample polishing, the surface of the sample is observed, and evidence is obtained; and fourthly, the surfaces of the samples polished through the metallographic phase water-soluble abrasive paste and the 99.9% industrial alcohol / pure aluminum oxide polishing powder are compared, if the microscopic structures of welding joints are not obviously different, the welded parts are welded parts made of the same material, and if the microscopic structures of the welding joints are obviously different, the welded parts are welded parts made of dissimilar materials. The method has the advantages of simplicity, rapidness, accuracy and the like.

Description

technical field [0001] The invention belongs to the technical field of metallographic welding, and relates to a method for judging welding materials, in particular to a visual non-corrosion detection method for enterprises and laboratories that can simply, quickly and accurately judge the characteristics of welding areas. Background technique [0002] When performing metallographic analysis on unknown weldments, it is first necessary to judge the similarities and differences of the types of weldment materials (that is, the same material or dissimilar materials), and then perform specific metallographic analysis. At present, the method for judging the similarities and differences of the materials of the welding parts is to prepare a sample metallographic sample that can be used for microscopic observation, and then judge whether the welding parts are of the same material or different materials by observing the microstructure characteristics of the surface of the sample. This ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N1/28G01N1/34G01N21/88
CPCG01N1/32G01N1/286G01N1/34G01N21/8803G01N2001/2866G01N2001/2873Y02E30/30
Inventor 杭韫刘澄万训智吕犇柳文晶王璇周文韬
Owner YANGZHOU UNIV
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