Weld beading size measuring method for two-dimensional image of small-diameter tube weld joint root

Abstract

The invention discloses a weld beading size measuring method for a two-dimensional image of a small-diameter tube weld joint root, which comprises the steps of extracting an image weld joint target area according to an actual weld joint position, and establishing an image pixel coordinate system in the target area; extracting a vertical line of the small-diameter pipe wall by utilizing self-adaptive thresholding operation; probabilistic Hough transform is used for detecting and obtaining the position of a vertical line of the inner pipe wall, and an inner welding wall area is segmented; enhancing and highlighting weld beading characteristics by utilizing inverse color, Gamma, morphological operation and Butterworth filtering; segmenting a weld beading from the maximum entropy threshold value; approximately fitting an ellipse of the inner weld joint wall according to the empirical value of the inner weld joint wall; and further fitting weld beading in the ellipse of the inner weld wall,and calculating the size of the weld beading. The reliability is improved, and the weld beading size of the two-dimensional image of the root of the small-diameter pipe weld joint can be accurately and effectively measured.

Description

technical field [0001] The invention relates to the technical field of weld bead size, in particular to a method for measuring the weld bead size of a two-dimensional image of the weld root of a small-diameter pipe. Background technique [0002] In the supercritical generator set, the boiler water wall small-diameter tube has an important cooling effect. The small-diameter tubes of the water-cooled wall are the main heating part of the boiler. It consists of several rows of steel tubes and is distributed around the boiler furnace. Its inside is flowing water or steam, and the outside receives the heat of the flame in the boiler furnace. The main function of the water-cooled wall small-diameter tube is to absorb the radiant heat of the high-temperature combustion products in the furnace, generate steam or hot water in the tube, and reduce the temperature of the furnace wall to protect the furnace wall. In recent years, with the mass production of large-capacity thermal powe...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the size of the weld bead in a two-dimensional image of the weld root of a small-diameter pipe, which can effectively improve the fitting reliability of the weld bead, can accurately and effectively measure the weld bead size of the two-dimensional image of the weld root of the small-diameter pipe, and solve the problem of The traditional small-diameter pipe weld root image weld bead size measurement method is susceptible to interference from non-weld bead areas, resulting in poor reliability and low accuracy

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