CN105758871A - Ray flaw detection technology - Google Patents

Abstract

The invention discloses a ray flaw detection technology comprising the following procedures: 1), the longitudinal seam number is numbered in a unified manner when each piece arrives, during piece distribution, the effective length of each piece cannot exceed 260 mm (the piece length of 3000 mm is adopted), the number of distributed pieces is determined according to the flaw detection proportion, and the piece is detected as long as the self length when the number is less than 1; and lap joint labels require to be complete; 2), transparent condition selection comprising 2.1) focal distance selection; 3) dark room treatment; 4) film evaluation comprising 4.1) acceptance standard comprising no type of cracks, no incompletely fused or non-thoroughly welded detect regions, or no extension included slag length with the length greater than or equal to the following values; only if the distance between discontinuous included slag is more than six times of the length of longest included slag, weld seams with any total length of 12T or less require not to exceed the whole long weld seam thickness of included slag balls in one line. The method has the advantages of simple operation, low requirements for operator experience and high product quality.

Description

A kind of radiographic inspection technique

Technical field

The present invention relates to a kind of radiographic inspection technique.

Background technology

The adjustment in processing step and device parameter etc. of the existing radiographic inspection technique there is also certain empirical and technical, for the operator newly started with, in addition it is also necessary to carry out substantial amounts of exercise and could grasp operation skill, produces the good product of quality.

Summary of the invention

In order to realize the purpose of the present invention, the present invention provides the radiographic inspection technique of a kind of easy to operate, quick, easy left-hand seat.

For solving above-mentioned technical problem, the present invention adopts the following technical scheme that

A kind of radiographic inspection technique, including following operation:

1), longitudinal joint number Unified number when being issued to by every, during pieces of cloth, the effective length of every must not surpass 260mm(and adopt 3000mm length of a film), the quantity of pieces of cloth presses percentage of detection, during less than 1 sheet, has how long according to how long；Overlap joint labelling must be complete；

1.1), the pieces of cloth quantity of cylinder boxing, by percentage of detection requirement, actual flaw detection length cannot be less than percentage of detection requirement；

1.2), paster regulation

1.2.1), all weld seam pieces of cloth directions are all with weld seam steel seal number for sequence, namely it is former pieces of cloth with weld seam steel seal number for initial and end, first sheet sequence number of circumferential weld is centered by T-shaped mouth, egative film is printed on welding seam No, sheet number, penetrameter overlap joint labelling, penetrometer putting leans on egative film effective range edge as far as possible, and filament is outside；

1.2.2), penetrameter be placed on radiographic source side in principle, if place penetrameter difficulty, when maybe can not place, film side can be placed on, but must have high-peaker test's result, and protocol and report in indicate；

1.2.3), when using lead to demarcate chi, can exempt to use other plumbous overlap joint labelling；

1.2.4), the unleaded joining seam labelling of automatic welding, or plumbous when demarcating chi, make waste paper without exception and process；

1.2.5), must having overlap joint labelling between sheet and sheet, circumferential weld lap length must not lower than 30mm, and tubule longitudinal joint lap length must not lower than 10mm；

2), transparent condition is chosen

2.1), focal length is chosen:

Principle: the condition (b is thickness of slab, and a is ray source focus size, and F is focal length) of Vg=ba/F-b should be met

2.2), the choosing of the exposure time in tube voltage source:

Principle: when the blackness specified in ensureing JB473-94 standard and sensitivity, select relatively low tube voltage and bigger tube current as far as possible；

2.3), flaw detection personnel press exposure curve transillumination；

2.4), exposure curve should be made regular check on；

3), darkroom disposal:

3.1), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.2), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.3), washing time is that circulating water rinses more than 20 minutes；

4), egative film evaluation:

4.1), acceptance criteria

Without any kind of crackle, incomplete fusion or lack of penetration defect area, equal to or more than the extension slag inclusion length of following numerical value without any length；

Unless continuously distance between slag inclusion exceedes six times of the longest slag inclusion length, the weld seam within any total length 12T, should less than the slag inclusion group of whole long throat depth on one wire.

The present invention is simple to operate, and operator's skill requirement is low, and product quality is high.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

A kind of radiographic inspection technique, including following operation:

1), longitudinal joint number Unified number when being issued to by every, during pieces of cloth, the effective length of every must not surpass 260mm(and adopt 3000mm length of a film), the quantity of pieces of cloth presses percentage of detection, during less than 1 sheet, has how long according to how long；Overlap joint labelling must be complete；

1.1), the pieces of cloth quantity of cylinder boxing, by percentage of detection requirement, actual flaw detection length cannot be less than percentage of detection requirement；

1.2), paster regulation

1.2.1), all weld seam pieces of cloth directions are all with weld seam steel seal number for sequence, namely it is former pieces of cloth with weld seam steel seal number for initial and end, first sheet sequence number of circumferential weld is centered by T-shaped mouth, egative film is printed on welding seam No, sheet number, penetrameter overlap joint labelling, penetrometer putting leans on egative film effective range edge as far as possible, and filament is outside；

1.2.2), penetrameter be placed on radiographic source side in principle, if place penetrameter difficulty, when maybe can not place, film side can be placed on, but must have high-peaker test's result, and protocol and report in indicate；

1.2.3), when using lead to demarcate chi, can exempt to use other plumbous overlap joint labelling；

1.2.4), the unleaded joining seam labelling of automatic welding, or plumbous when demarcating chi, make waste paper without exception and process；

1.2.5), must having overlap joint labelling between sheet and sheet, circumferential weld lap length must not lower than 30mm, and tubule longitudinal joint lap length must not lower than 10mm；

2), transparent condition is chosen

2.1), focal length is chosen:

Principle: the condition (b is thickness of slab, and a is ray source focus size, and F is focal length) of Vg=ba/F-b should be met

2.2), the choosing of the exposure time in tube voltage source:

Principle: when the blackness specified in ensureing JB473-94 standard and sensitivity, select relatively low tube voltage and bigger tube current as far as possible；

2.3), flaw detection personnel press exposure curve transillumination；

2.4), exposure curve should be made regular check on；

3), darkroom disposal:

3.1), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.2), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.3), washing time is that circulating water rinses more than 20 minutes；

4), egative film evaluation:

4.1), acceptance criteria

Without any kind of crackle, incomplete fusion or lack of penetration defect area, equal to or more than the extension slag inclusion length of following numerical value without any length；

Unless continuously distance between slag inclusion exceedes six times of the longest slag inclusion length, the weld seam within any total length 12T, should less than the slag inclusion group of whole long throat depth on one wire.

Claims (1)

1. a radiographic inspection technique, is characterized in that: include following operation:

1), longitudinal joint number Unified number when being issued to by every, during pieces of cloth, the effective length of every must not surpass 260mm(and adopt 3000mm length of a film), the quantity of pieces of cloth presses percentage of detection, during less than 1 sheet, has how long according to how long；Overlap joint labelling must be complete；

1.1), the pieces of cloth quantity of cylinder boxing, by percentage of detection requirement, actual flaw detection length cannot be less than percentage of detection requirement；

1.2), paster regulation

1.2.1), all weld seam pieces of cloth directions are all with weld seam steel seal number for sequence, namely it is former pieces of cloth with weld seam steel seal number for initial and end, first sheet sequence number of circumferential weld is centered by T-shaped mouth, egative film is printed on welding seam No, sheet number, penetrameter overlap joint labelling, penetrometer putting leans on egative film effective range edge as far as possible, and filament is outside；

1.2.2), penetrameter be placed on radiographic source side in principle, if place penetrameter difficulty, when maybe can not place, film side can be placed on, but must have high-peaker test's result, and protocol and report in indicate；

1.2.3), when using lead to demarcate chi, can exempt to use other plumbous overlap joint labelling；

1.2.4), the unleaded joining seam labelling of automatic welding, or plumbous when demarcating chi, make waste paper without exception and process；

1.2.5), must having overlap joint labelling between sheet and sheet, circumferential weld lap length must not lower than 30mm, and tubule longitudinal joint lap length must not lower than 10mm；

2), transparent condition is chosen

2.1), focal length is chosen:

Principle: the condition (b is thickness of slab, and a is ray source focus size, and F is focal length) of Vg=ba/F-b should be met

2.2), the choosing of the exposure time in tube voltage source:

Principle: when the blackness specified in ensureing JB473-94 standard and sensitivity, select relatively low tube voltage and bigger tube current as far as possible；

2.3), flaw detection personnel press exposure curve transillumination；

2.4), exposure curve should be made regular check on；

3), darkroom disposal:

3.1), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.2), by special messenger being responsible for darkroom work (including section) to develop a film and cool, length of a film Uniform provisions is 300mm length and 15mm length, in strict accordance with formula and the treatment conditions of regulation；

3.3), washing time is that circulating water rinses more than 20 minutes；

4), egative film evaluation:

4.1), acceptance criteria

Without any kind of crackle, incomplete fusion or lack of penetration defect area, equal to or more than the extension slag inclusion length of following numerical value without any length；

Unless continuously distance between slag inclusion exceedes six times of the longest slag inclusion length, the weld seam within any total length 12T, should less than the slag inclusion group of whole long throat depth on one wire.