GB/T 39638-2020X-ray digital radiographic testing for casting (English PDF)

1 Scope

This standard specifies the classification and compensation rules of X-ray digital imaging detection technology for castings using Digital Detector Array (DDA), general

Requirements, inspection technology, image evaluation, inspection records and reports, etc:

This standard applies to the casting of steel, iron, copper and copper alloys, nickel and nickel alloys, aluminum and aluminum alloys, magnesium and magnesium alloys, titanium and titanium alloys, etc:

Parts, other metal material castings can also be used as reference:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 5677 Casting radiographic inspection

GB/T 9445 Non-destructive testing personnel qualification and certification

GB/T 12604:11 Non-destructive testing terminology X-ray digital imaging testing

GB 18871 Basic standard for ionizing radiation protection and radiation source safety

GB/T 23901:1 Non-destructive testing: Radiographic testing of image quality: Part 1: Determination of image quality value of silk-type image quality indicator

GB/T 23901:2 Non-destructive testing: Radiographic testing of image quality: Part 2: Determination of image quality value of step hole image quality indicator

GB/T 23901:5 Non-destructive testing: Radiographic testing of image quality: Part 5: Double-filament image quality indicators with unclear images

Determination

GB/T 30821 Non-destructive testing digital image processing and communication

GB/T 35389 Non-destructive testing X-ray digital imaging testing guidelines

GB/T 35394 Non-destructive testing X-ray digital imaging testing system characteristics

GBZ 98 Health requirements for radiation workers

GBZ 117 Industrial X-ray inspection radiation protection requirements

3 Terms and definitions

The following terms and definitions defined in GB/T 12604:11 apply to this document:

3:1

Nominalthickness

The nominal wall thickness of the material, regardless of deviation:

3:2

Penetratedthickness

The nominal thickness of the material in the radiographic direction: In the case of multi-wall transillumination, the penetration thickness is the sum of the nominal thickness of each layer of material passed through:

3:3

The distance from the workpiece to the detector objecttoDDAdistance

The distance between the surface of the inspected workpiece at the source side and the detector measured along the centerline of the ray beam: