Penetration prediction and control method and system for laser welding of variable-thickness section plate

A laser welding and panel technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as burn-through, lack of fusion, and coarse weld structure, and achieve high precision.

Active Publication Date: 2021-06-11
HUNAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The limitation of this method is that any uncertain disturbance (such as plate thickness deviation, assembly gap change, laser power fluctuation, etc.) Coarse suture tissue, stomata and other defects
Therefore, it is difficult to reliably apply the method of controlling deep penetration of thickened cross-section materials based on manual experience in the mass welding manufacturing process on the production line.

Method used

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  • Penetration prediction and control method and system for laser welding of variable-thickness section plate
  • Penetration prediction and control method and system for laser welding of variable-thickness section plate
  • Penetration prediction and control method and system for laser welding of variable-thickness section plate

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Embodiment 1

[0054] Here, the variable-thickness cross-section plate steel produced by Baosteel Group Co., Ltd. is taken as the research object to further illustrate the principle of the present invention. The steel type of the specimen is B340LA, and its chemical composition is shown in Table 1. The size of the welded test piece is 240mm×30mm, and the thickness varies from 1.2mm to 2.0mm. Shot blasting is performed on the welding surface before the test. Removing oxides on the surface of the material can also increase the surface roughness, reduce the reflection of the material to the laser, and improve the absorption rate of the material to the laser.

[0055] Table 1 B340LA steel chemical composition (mass fraction, %)

[0056]

[0057] When the laser power is 800w, the 1.2mm thick area is not penetrated; when the laser power is 1700w, the 2mm thick area has collapse defects. Therefore, welding is carried out with the technological parameters of laser power 800-1700w, welding speed...

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Abstract

The invention discloses a method for predicting and controlling penetration depth of laser welding of thickened cross-section plates. Laser power parameters and weld cross-section information in the process of penetration to over-penetration; 2) With the help of regression analysis method, the regression model of laser welding penetration of variable-thickness cross-section plate is constructed. According to the error characteristics, the accuracy of the model is judged, and the best model is selected; 3), according to the variation law of the thickness of the thickened section plate that needs to be laser welded, the optimal processing parameters are calculated through the regression model. The invention can predict and control the shape information of the laser welding seam section of the thickened section plate.

Description

technical field [0001] The invention relates to a penetration prediction and control method for laser welding of thickened cross-section plates, in particular to a method and system for predicting and controlling the cross-sectional shape information of laser welded seam of thickened cross-section plates. Background technique [0002] The automobile industry is a national pillar industry, and energy conservation and emission reduction have become a revolutionary topic for the low-carbon development of the automobile industry. The use of thickened cross-section plates can effectively reduce the weight of automobiles on the basis of ensuring the strength of automobile parts. However, in the application process, it was found that the connection of materials with thickened cross-sections has become one of the key problems that need to be solved urgently in the manufacturing process of this type of materials. The total amount of welding heat input is achieved. Laser welding tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20B23K26/03
CPCB23K26/03B23K26/21G06F30/20
Inventor 张屹陆润东李福南张哲豪赵鹏辉韦海英
Owner HUNAN UNIV
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