Detection and quality judgment method for strip steel weld surface appearance

A surface topography, strip weld technology, applied in the direction of measuring devices, optical testing flaws/defects, instruments, etc., can solve the problems of inaccurate judgment, lack of test result analysis function, and inability to judge the fracture resistance of welds Edge defects and other problems to achieve the effect of preventing broken belts

Inactive Publication Date: 2014-01-29
BAOSHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the quality of strip welds is usually judged by the on-site operators with naked eyes. This method of discrimination obviously has defects in the experience of the operators and the judgment standards, and there are problems of low efficiency and inaccurate judgment.
[0003] The QCDS system launched by Miebach can realize the automatic detection of the weld seam appearance. The system uses online CCD video to observe the weld seam appearance on the surface of the strip steel, and can provide the topography map of the weld seam surface in time, and the weld seam The concave and misaligned curves are used by the operator to judge the quality of the weld and realize the real-time online detection of the surface morphology of the weld. However, the system cannot judge the undercut defect that seriously affects the fracture resistance of the weld, and there are also deficiencies in the judgment standard
[0004] Chinese patent application number 200810229989 discloses "a visual sensor for weld surface quality based on line structured light", which can be used to obtain the topography of the weld surface, but the patent does not mention the specific parameters of the line laser, especially is the scanning frequency, and the technology mentioned in this patent does not have the function of analyzing the test results

Method used

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  • Detection and quality judgment method for strip steel weld surface appearance
  • Detection and quality judgment method for strip steel weld surface appearance
  • Detection and quality judgment method for strip steel weld surface appearance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Rolling process of automotive sheet in cold rolling line.

[0048] 1) The weld detection system consists of a laser, a trigger switch, an upper industrial computer and a lower PC. The laser, trigger switch, and upper industrial computer are fixed on the welding machine and move with the welding machine during the detection process. The lower PC is placed In the operating room, a weld evaluation system is installed in the lower computer.

[0049] 2) The linear laser adopts CC3000-30 from American Bytewise Company to complete the scanning of the weld seam shape. The scanning width range is 10mm, the height detection range is 30mm, and the detection accuracy is 0.015mm. The detected data are sent to the upper industrial computer in real time , The detection frequency is 30HZ. The upper industrial computer is responsible for the collection and processing of signals, filters the data collected by the laser, collects the data within the range of 3mm (10mm in total) on both s...

Embodiment 2

[0058] The composition of the system is the same as that of Example 1. For low-grade silicon steel, due to the high brittleness of the material, the evaluation index needs to be adjusted. The adjusted index is shown in Table 2. Using this index to evaluate low-grade silicon steel welds can control the broken belt rate below 1‰.

[0059] Table 2 Evaluation indicators for low-grade silicon steel

[0060] serial number

Embodiment 3

[0062] The composition of the system is the same as in Example 1. For medium-grade silicon steel, due to the high silicon content in the material and the high brittleness of the material, it is necessary to strictly limit the defect threshold. The adjusted indicators are shown in Table 3. Using this index to evaluate the weld seam of medium-grade silicon steel can control the broken belt rate below 1‰.

[0063] Table 3 Evaluation indicators for low-grade silicon steel

[0064] serial number

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Abstract

Disclosed is a detection and quality judgment method for strip steel weld surface appearance. The surface of a weld is scanned by a linear laser; the values such as weld stack height, depression, undercut and misalignment are calculated according to scanned data; the quality of the weld is judged according to the values; accordingly, the surface appearance quality of the weld is judged continuously. The method has the advantages that the surface appearance of the weld can be detected fast and evaluated fast, fast continuous operation of an acid tandem rolling is ensured, and breakage of strip steel is prevented.

Description

technical field [0001] The invention relates to a strip steel surface detection technology, in particular to a detection and quality judgment method for the surface appearance of a strip steel weld seam. Background technique [0002] At present, the quality of strip welds is usually judged by on-site operators with naked eyes. This method of discrimination obviously has defects in the experience of operators and judgment standards, and there are problems of low efficiency and inaccurate judgment. [0003] The QCDS system launched by Miebach can realize the automatic detection of the weld seam appearance. The system uses online CCD video to observe the weld seam appearance on the surface of the strip steel, and can provide the topography map of the weld seam surface in time, and the weld seam The concave and misaligned curves allow the operator to judge the quality of the weld and realize the real-time online detection of the surface morphology of the weld. However, the syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01N21/88
Inventor 毛兴潘红良
Owner BAOSHAN IRON & STEEL CO LTD
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