Device and a method for detecting geometric parameters of steel bar weld joint

Abstract

The invention provides a device and a method for detecting geometric parameters of a steel bar weld joint. The method comprises the following steps: acquiring a weld joint image in real time; preprocessing the obtained weld joint image, carrying out binarization processing on the weld joint image, and extracting a light bar center of the preprocessed weld joint image by adopting a gray scale square weighted threshold gravity center method; converting a coordinate system of the obtained weld joint image to obtain a relationship between an image coordinate system and a world coordinate system; based on the relationship between the image coordinate system and the world coordinate system and the image data statistics of the weld joint, obtaining the length, width, thickness and saturation of the weld joint; and outputting a result. By processing a structured light strip image, a sub-pixel precision strip center line can be extracted, a precise intersection line of structured light and a target is obtained, intersection line turning point coordinates can be used as target feature point pixel coordinates, and the measurement precision and efficiency are ensured; the invention further provides a device for obtaining the weld joint parameters based on the line-to-line structured light, and the detection efficiency, accuracy and consistency can be improved.

Description

technical field [0001] The invention belongs to the field of weld seam detection, and in particular relates to a device and method for detecting geometric parameters of steel bar weld seams. Background technique [0002] Weld surface quality inspection refers to the external dimensions of the weld such as mismatch, distortion, etc., the macroscopic dimensions of the weld such as fusion width, protrusion and concavity, and the surface defects of the weld such as pores, Undercut, incomplete penetration, etc. are inspected for appearance. Weld appearance inspection is helpful to find its internal defects. For example, if there is an undercut on the surface of the weld, there may be infusion inside. If there are pores on the surface of the weld, it means that the internal structure is not dense. Weld appearance inspection can not only determine whether the welding quality of the weld is qualified, but also judge whether the welding process is reasonable. Therefore, the appearan...

AI Technical Summary

Problems solved by technology

The welding inspection ruler is a measuring instrument that uses the principle of line pattern and vernier measurement to inspect the weld width, height, welding gap, groove angle, undercut depth, etc. of the weldment. The welding inspection ruler is inconvenient to measure and has large human error. , the accuracy of the measurement results is not high, and the efficiency is low

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