Dual-beam laser welding process defect control method based on acoustical-optical signal monitoring

An acousto-optic signal and laser welding technology, applied in the direction of optical testing flaws/defects, measuring devices, optical devices, etc., can solve the difficulty of double-beam laser welding non-fusion defect detection, can not determine the location of local non-fusion defects, detection means To reduce the risk of unfused defects, optimize the welding process parameters, and simplify the detection process

Active Publication Date: 2018-08-07
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems such as the difficulty in detecting unfused defects in double-beam laser welding of T-shaped joints, cumbersome detection methods, low detection efficiency, and inability to determine the location of local unfused defects, the present invention provides a method for controlling defects in the welding process of double-beam laser welding , through online identification of information such as the position and size of unfused defects, the operator corrects welding parameters through feedback information, and realizes timely discovery and control of weld

Method used

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Examples

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Effect test

Example Embodiment

[0036] Example 1

[0037] Taking the non-fusion defect control of TC4 titanium alloy double-beam laser welding T-joint test plate as an example, the acousto-optic characteristic signal recognition of non-fusion defect of TC4 titanium alloy double-beam laser welding T-joint test plate, welding defects, characteristic signals and process parameters match Relationship establishment, characteristic signal determination of non-fusion defects, identification of defect location and other information, and repair of non-fusion defects through repair welding and other means.

[0038] Its specific implementation process is:

[0039] The first step is to identify the acousto-optic characteristic signals of unfused defects. Install the audible sound, infrared and blue-violet light collection devices on the laser head, on the same plane as the laser incident surface, 150mm away from the welding seam, mark the position information on the welding test plate, collect and record the TC4 titanium

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Abstract

The invention relates to a dual-beam laser welding process defect control method based on acoustical-optical signal monitoring. Instable process characteristics of a laser welding process are analyzedvia process monitoring means to obtain instable process signal characteristic information; instable characteristic information, such as position and dimensions, is recognized online via real-time monitoring and comparing, and is repaired. Specifically, according to the method, defective characteristic signals are recognized; a matching relationship among welding defects, characteristic signals and process parameters is established; the characteristic signals with poor fusion defect occurred are judged; the information such as defect position is recognized; poor fusion defects are repaired bymeans of repair welding and the like. Defect information of weld seams can be acquired and repaired in real time in the method; welding quality of T-shaped connector subjected to dual-beam laser welding is improved.

Description

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Claims

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Application Information

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Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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