Method for choosing exposure parameter by using X ray exposure equation

A technology of exposure parameters and X-rays, which is applied in the direction of material analysis, optics, and instruments using radiation, and can solve problems such as large errors

Inactive Publication Date: 2008-10-29
陕西化建工程有限责任公司
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Problems solved by technology

The X-ray exposure curve made by the ladder test block is used for X-ray flaw detection of small diameter pipe girth welds. When selecting exposure parameters, due to the difference between the plane and the arc surface, the actual transillumination thickness value changes continuo

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  • Method for choosing exposure parameter by using X ray exposure equation

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Embodiment Construction

[0027] 1.1 Technical Difficulty in X-ray Inspection of Girth Weld of Small Diameter Pipe

[0028] 1.1.1 Theoretical Analysis of Technical Difficulty

[0029] (1) The difference between the flat stepped test block and the circular arc surface of the small-diameter pipe girth weld

[0030] Whether it is tube voltage-transillumination thickness (KV-T) type exposure curve, or exposure amount-transillumination thickness (E-T) type exposure curve, all are by changing exposure parameters (for example, fixed tube voltage KV, changing exposure amount E ; Or fix the exposure amount E, change the tube voltage KV), and transilluminate the flat ladder test blocks made of different fixed thicknesses. The object of X-ray flaw detection is the girth weld of small-diameter pipes, and the transillumination thickness of the arc surface changes continuously. Using the exposure curve made by the plane step test block for the circular arc surface of the small-diameter pipe girth weld, and selecti...

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Abstract

The invention relates to a method for selecting exposure parameters by using an X-ray exposure equation, which uses the X-ray exposure equation to select exposure parameters of small-diameter tube ring welding seam X-ray flaw detection, thus having good effect on the control for the sensitivity of flaw detection of the X-ray, latitude of the thickness and blackness of films; the proposal adopted by the invention is that: (1) the original exposure curve is used for selecting a plurality of exposure parameters with estimation and carrying out transillumination for small-diameter pipe ring welding seams, thus obtaining a plurality of X-ray films; (2) films with the technical parameter meeting the requirement are selected from the X-ray films; tube voltage V, exposure time t and transillumination thickness TA of each film are recorded; V is taken as a dependent variable, TA and t are taken as independent variables, each group of data of V, T and t is made into a scatter diagram by crunodes on a piece of coordinate paper, and the exposure original equation of the X-ray is obtained by observing: V is equal to a0 plus a1t plus a2TA, which represents a plane on the geometry and can solve the problem that the changing parameter in the exposure curve can not be continuous.

Description

1. Technical field: [0001] The invention relates to a pipeline X-ray flaw detection method, in particular to a method for selecting exposure parameters by using an X-ray exposure equation. 2. Background technology: [0002] In the background technology, X-ray flaw detection is performed on the girth weld of small-diameter pipes, and the exposure parameters selected by using the exposure curve have large errors due to various reasons. Generally, the nominal diameter of the pipe is D e ≤100mm pipes are called small diameter pipes. The X-ray exposure curve made by the ladder test block is used for X-ray flaw detection of small diameter pipe girth welds. When selecting exposure parameters, due to the difference between the plane and the arc surface, the actual transillumination thickness value changes continuously, and the actual transillumination thickness ratio is large Due to the large thickness ratio between the weld zone and the base metal zone, the selection of the trans...

Claims

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Application Information

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IPC IPC(8): G01N23/18G03B42/02
Inventor 胡锡宁龚固袁黎明张来民李丽红贺小锋
Owner 陕西化建工程有限责任公司
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