What is the national standard for color flaw detection?

The standard of color flaw detection is:

1. Pre-cleaning of workpiece surface

Before applying penetrant to the inspected surface, clean the workpiece with cleaning agent to make the inspected surface free of oil stain, rust, debris, paint layer and other dirt.

2, coloring infiltration

Spray penetrant evenly on the cleaned workpiece surface for 5- 15 minutes.

Step 3 clean and dry

After infiltration for 5- 15 minutes, before using developer, use cleaning agent to clean all penetrants sprayed on the surface of the workpiece to make the inspected surface clean.

4. Imaging

After the developer is fully shaken, evenly spray the surface of the inspected workpiece at a height distance of 150 mm to 300 mm, the spraying angle is 30-40, and the development time is preferably not less than 7 minutes.

Step 5 observe

It takes 7- 15 minutes to observe and display the traces, and the observation and development should be carried out within 7-60 minutes after the developer is applied.

6, the result judgment and record

Judging the size and severity of defects according to the size and color depth of the displayed traces, and marking the parts where the surface defects show traces. Defects can be traced, and should be recorded by photography, schematic diagram or developer as needed.

7. Contents of flaw detection report

First, the code, name, material, surface state and quantity of the workpiece to be inspected, then the detection sensitivity (indicating the type of reference block) and flaw detection results, and then the application date and report date.

8, color penetrant inspection safety operation procedures

The flaw detection site should be well ventilated, away from fire and heat sources, and the operator should stand upwind. ? Operators must wear gloves and masks to ensure that they do not harm the skin, and avoid skin damage caused by repeated contact with flaw detection agents for a long time.

Extended data

The contents of the flaw detection report include:

1, code, name, material, surface state and quantity of the inspected workpiece;

2, commissioned by the unit, according to the technical documents and inspection requirements for inspection;

3. Model and category of color flaw detector;

4, detection sensitivity (indicate the type of reference block), flaw detection results;

5. Signature of flaw detector and auditor;

6. Date of application and date of report.

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