Macroscopic metallographic shooting analysis device for pipeline circumferential weld and using method thereof

Abstract

The invention discloses a macroscopic metallographic shooting analysis device for a pipeline circumferential weld and a using method thereof. An image acquisition device is fixed on a fixing frame; afocusing knob and an amplification factor adjusting knob are arranged on the image acquisition device; a soft light illumination system is arranged on the outer ring of the bottom end of a lens of theimage acquisition device; and a measuring scale is arranged at the position, where a to-be-detected weld joint sample is placed, on the fixing frame. The image acquisition device is used for acquiring image information of a to-be-detected weld joint sample and sending collected image information to an image processing module; the image processing module is used for carrying out brightness adjustment, contrast enhancement processing and weld joint fusion line contour extraction on the received image information and sending the processed image information to an image measurement module; and theimage measurement module is used for measuring the defect size in a weld joint. According to the invention, the high-quality macroscopic metallographic picture of the circumferential weld can be quickly obtained, the defect size and the like in the welded joint can be directly inspected and measured, and the inspection result is accurate and reliable.

Description

technical field [0001] The invention belongs to the field of weld metallographic detection, and in particular relates to a macroscopic metallographic photographing and analysis device for pipeline girth welds and a use method thereof. Background technique [0002] As an economical, safe and continuous transportation method, long-distance pipelines have been widely used in the transportation of oil, natural gas and liquid slurry. For long-distance oil and gas transmission pipeline projects, steel pipes are usually connected by on-site welding (butt girth weld). Because the existence of girth welds destroys the structural integrity of long-distance pipelines, pipeline failure accidents occur frequently. Therefore, pipeline owners and construction parties pay more and more attention to the welding process and quality of pipeline girth welds. [0003] The macroscopic metallographic analysis test of the girth weld weld joint is a means to evaluate the welding process and weldin...

AI Technical Summary

Problems solved by technology

[0004] During laboratory inspection, because there is no suitable macroscopic metallographic shooting device, the testers often use mobile phones or digital cameras to take pictures. The light source conditions are relatively poor and the image quality is uneven; For quantitative measurement and description, it is also necessary to measure the defect size with the help of an optical metallographic microscope

Therefore, the quality of the macroscopic metallographic picture of the girth weld obtained by the prior art is poor, and the result is inaccurate; when there is a welding defect, it is sometimes necessary to use an optical microscope for analysis, which is time-consuming and laborious

Images