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Measuring method of welding joint shaping organizational characteristics

A technology of welded joints and measurement methods, which is applied in the measurement of welded joints' forming structure characteristics and the evaluation of welding quality, which can solve the problems of inability to accurately identify contour feature points, etc., and achieve the effects of eliminating burrs, good results, and reducing the amount of calculation

Inactive Publication Date: 2010-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, these methods all rely on the curvature of the points to a certain extent. Due to the irregularity of the joint forming contour, these methods cannot accurately identify the contour feature points.

Method used

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  • Measuring method of welding joint shaping organizational characteristics
  • Measuring method of welding joint shaping organizational characteristics
  • Measuring method of welding joint shaping organizational characteristics

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Embodiment Construction

[0029] figure 2 It is a flowchart of steps of the present invention. The redundant curve is y=ax 2 +bx+c and x=ay2 +by+c two forms, a, b, c are the coefficients of the quadratic term, the first term, and the constant term respectively, which are all fitted by the least square method, x is the abscissa variable, and y is the ordinate variable. The curves used in the steps are the embodiment of these two forms, and the meanings of the parameters are the same as above.

[0030] The specific steps are:

[0031] 1. Process the joint image, extract the joint contour, and binarize the joint contour image, the value of the contour point is 1, and the value of other points is 0. figure 1 Schematic diagram of a welded joint.

[0032] 2. Use the depth-first search method to obtain the burr-free connected contour in the joint image, and obtain the coordinates of the contour points, and then discretize the contour:

[0033] 2.1 Scan the binarized contour image pixels in step 1 from t...

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Abstract

The invention discloses a measuring method of welding joint shaping organizational characteristics, comprising the following steps: binary processing the joint outline images; eliminating the transverse and longitudinal burrs on the binary outline images by adopting a depth-first search method; discretizing the binary outline images after elimination of burrs; searching outline segmentation points by adopting a two-point distance deviation method to realize the segmentation of the joint outline; fitting each segment into a quadratic curve respectively; identifying the characteristic point of each quadratic curve; carrying out approximately symmetrical treatment on the quadratic curve for calculating the joint shaping characteristics. The invention accurately analyzes the change regulation of joint outline shapes, improves the measuring accuracy and is beneficial for analyzing the welding quality.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a method for measuring the structural characteristics of welded joints, which is used for evaluating welding quality. Background technique [0002] In the laser welding process, the interaction between the laser and the material, the photoinduced plasma, the behavior of the pinhole and the weld pool determine the quality of the final weld, and it is extremely difficult to gain insight into these phenomena or physical processes, so through the joint Forming to evaluate the quality of welding has become the main means at present. The shape of the welded joint is closely related to the performance of the joint, and is mainly affected by various factors such as materials, heat transfer, and mass transfer during the welding process. The main feature refers to the shape of the cross-section of the weld. At present, the analysis sample of the welded joint image is generally cut a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
Inventor 张朴李旺火刘文中孔力
Owner HUAZHONG UNIV OF SCI & TECH
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