Thickness semi-compensated x-ray radiography inspection method of plug-in weld seam

Abstract

The invention provides a half-compensation X-radiographic testing method for the thicknesses of inserting-bushing type welding lines. The method comprises the following steps: (a) selecting an arc-shaped plate as a compensation block, wherein the arc radius of the compensation block is accordant with the focal length during a X-radiographic process; (2) machining a plurality of compensation holes in the compensation block, wherein the diameter of each compensation hole is 1.01-1.03 times the thickness of the compensation block, and the distances from the welding lines to the edge of the compensation block are not less than 10mm by virtue of the depths of the compensation holes; (3) inserting the inserting-bushing type welding lines into the compensation holes during an X-ray transillumination process, putting an integral body formed by the inserting-bushing type welding lines and the compensation block on a film, and carrying out transillumination in a central exposure manner, wherein the radiographic condition parameters are that the focal length is 500-1000 mm, the quantity of exposure is 15-40 mA.min, and the transillumination voltage is 150+ / -30 kV. According to the method disclosed by the invention, the imaging qualities of different regions in the compensation block are accordant; as the thickness of the compensation block is slightly smaller than the diameter of each compensation hole, the transillumination thickness is effectively reduced, the radiographic sensitivity is greatly improved, and the accuracy and reliability of a detection result are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of weld seam detection, and in particular relates to an X-ray photographic detection method for internal defects of socket-type weld seams or rods. Background technique [0002] The socket-type weld belongs to the rod-shaped weld. When manufacturing, the end plug recess is inserted into the cladding tube, and then the end plug and the cladding tube are welded together by electron beam welding. The plug-in rod-shaped weld usually adopts the flat-panel photographic method with full compensation for weld thickness. In this photographic method, the compensation block is flat-shaped, and the axial direction of the compensation hole is perpendicular to the thickness direction of the flat plate. The diameter of the compensation hole is much smaller than the thickness of the compensation plate. The contours are all located inside the thickness direction of the compensation block, and the schematic diagram of the com...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a half-compensated X-ray photographic inspection method for plug-in weld seam thickness, which solves the problem of low sensitivity of photographic inspection caused by the thicker thickness of the compensation block and the difference in transillumination thickness between the middle and end of the compensation block. The problem of different image quality

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