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Three-dimensional measurement method of weld seam surface after welding based on laser grating projection

A technology of three-dimensional measurement and weld surface, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of large inspection workload, the influence of contact wear of inspection results, and only qualitative analysis, and achieve three-dimensional precision measurement. , The system is simple and compact

Active Publication Date: 2022-06-21
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

The traditional manual visual inspection or detection ruler has a large workload and can only be analyzed qualitatively. The detection results are easily affected by subjective factors or the contact wear of the detection ruler.

Method used

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  • Three-dimensional measurement method of weld seam surface after welding based on laser grating projection
  • Three-dimensional measurement method of weld seam surface after welding based on laser grating projection
  • Three-dimensional measurement method of weld seam surface after welding based on laser grating projection

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Embodiment Construction

[0039] The present invention will be further described in detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0040] according to figure 1 A 3D welding seam measurement system based on stroboscopic laser grating stripes is built. build as image 3 The shown space maps the 3D measurement model and realizes the system calibration. Through the established model and calibration results, the phase information of the fringe image is accurately converted into the real 3D data of the weld, and the 3D measurement of the weld after welding is realized. write figure 2 The system software shown is used to collect and display weld images and weld image processing results. The design is completed and a deep fringe enhanced convolutional neural network for filtering the background light intensity of grating fringes and generating high-modulation grating fringes is complete...

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Abstract

The invention relates to a three-dimensional measurement method for the weld surface after welding based on laser grating projection. The phase information is converted and calculated into real three-dimensional data of the weld; a deep fringe-enhanced convolutional neural network for filtering the background light intensity of grating stripes and generating high-modulation grating fringes is built; a deep phase extraction convolutional neural network for extracting fringe phases is built network. The phase information is substituted into the three-dimensional measurement model to complete the measurement of the three-dimensional coordinates of the weld surface. The method of the invention can realize the three-dimensional precise measurement of the weld seam surface after welding under the conditions of complex ambient light and strong metal reflection characteristics at the welding site.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and relates to a three-dimensional measurement method of a welding seam surface, in particular to a three-dimensional measurement method of a welded seam surface after welding based on laser grating projection. Background technique [0002] The quality of the weld formation after welding is an important indicator for evaluating the quality of the weld, because the appearance of the weld can well reflect the internal quality of the weld, and it can also judge the rationality of the welding process specification. Good post-weld weld formation should have uniform, meticulous and beautiful surface ripples, correct geometry, moderate weld height, and smooth transition between weld and base metal. However, in actual welding, important defects such as undercut, porosity, weld flash, incomplete fusion, and incomplete welding usually occur. The analysis of the appearance characteristics o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00G01B11/25G06N3/04
CPCG01B11/002G01B11/254G01B11/2527G06N3/045
Inventor 杨国威张金丽王以忠
Owner TIANJIN UNIV OF SCI & TECH
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