High-efficiency laser deep penetration welding method for achieving double-side forming of sheet metal through single-side welding

A technology of laser deep penetration welding and metal sheet, applied in welding/welding/cutting articles, welding equipment, metal processing, etc. Improvement of laser energy utilization, strong engineering value and application prospects, and the effect of quality improvement

Active Publication Date: 2014-08-13
佛山市金晓宝净化彩板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to "at present there is not yet a high-efficiency laser deep penetration welding method that realizes single-sided welding and double-sided forming of metal sheets under low heat input conditions, and is based on controlling metal sheet welding deformation and reducing heat affected zones. Due to the consideration of low heat input laser deep penetration welding of metal sheets, the shape of the metal sheet is a nail head shape (V shape), which restricts the application of laser deep penetration welding technology in the field of metal sheet welding. High-efficiency laser deep penetration welding method for single-sided welding and double-sided forming of metal sheets

Method used

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  • High-efficiency laser deep penetration welding method for achieving double-side forming of sheet metal through single-side welding
  • High-efficiency laser deep penetration welding method for achieving double-side forming of sheet metal through single-side welding
  • High-efficiency laser deep penetration welding method for achieving double-side forming of sheet metal through single-side welding

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Embodiment 1

[0028] A high-efficiency laser deep penetration welding method for realizing single-sided welding and double-sided forming of metal sheets, which includes the following main steps:

[0029] Step 1: Clean the surface to be welded.

[0030] The cleaning process includes:

[0031] 1. Use alkaline solution (composed of 5%~10% by volume NaOH+residual alcohol (or acetone) solution) to remove the oil on the surface of the metal sheet to be welded, and after drying, sand the surface to be welded with sandpaper to remove the surface oxide layer ;

[0032] 2. Pickling the polished metal sheet with an acidic solution (mixed with 30-40ml of hydrofluoric acid, 300ml of nitric acid and the rest of deionized water per liter);

[0033] 3. Ultrasonic cleaning is carried out with absolute ethanol, and the cleaned metal sheet is dried for use;

[0034] Step 2: Secure the reflective backing.

[0035] When fixing the reflective backing plate: first, choose a metal plate that reflects the laser...

Embodiment 2

[0038] Such as Figure 2-4 shown.

example 1

[0042] The metal thin plate sample, powder flakes, laser equipment and laser process parameters used in Example 1 are all the same as those described in Comparative Example 1. The difference between it and Comparative Example 1 is that it adopts the technical solution of the present invention, and the reflective backing plate is After treatment, the surface is dark gray TC4 alloy sheet. Welding is carried out one by one according to the steps described in the foregoing embodiment 1, and the cross-sectional appearance of the obtained laser deep penetration welding metal sheet is as follows image 3 shown. from image 3 It can be seen from the figure that the appearance of the metal sheet laser deep penetration welding weld obtained by the method of the present invention is an hourglass shape (X shape), and the cross-sectional area of ​​the weld zone is 0.7598mm 2 , the laser energy utilization rate is evaluated by the cross-sectional area of ​​the weld seam obtained under the...

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Abstract

A high-efficiency laser deep penetration welding method for achieving double-side forming of sheet metal through single-side welding is characterized in that a reflection cushion plate is added on the back of the laser welding sheet metal to utilize the reflection cushion plate to reflect instantaneous laser of laser full penetration sheet metal back to a welding area to conduct secondary heating on the welding area to further achieve a double-side forming hourglass-shaped (X-shaped) welding seam through single-side welding. The method is mainly composed of steps of cleaning the surface to be welded, fixing the reflection cushion plate, conducting laser welding on the sheet metal and the like. The method achieves the aim that the single-side welding is conducted on the sheet metal to achieve double-side forming under the low heat input condition, breaks through the defect that the existing sheet laser deep penetration welding can obtain the hourglass-shaped (X-shaped) welding seam only under the high heat input condition, achieves double effects of considering welding seam dynamic performance and controlling heat deformation and heat effects of the sheet and lays a foundation for promotion of wide application of a laser deep penetration welding technology in the sheet metal welding field.

Description

technical field [0001] The present invention relates to a laser welding method, especially a laser welding method for thin metal plates. Specifically, it uses a reflective backing plate to reflect the laser light that penetrates the metal thin plate instantly back to the welding area, thereby improving the welding performance. The high-efficiency laser deep penetration welding method for single-sided welding and double-sided forming of metal sheets is realized by secondary heating in the area. Background technique [0002] Laser welding has the advantages of good forming quality, small heat-affected zone, small workpiece deformation, less subsequent processing, and high flexibility. It is very suitable for welding and forming of thin metal plates. Laser welding can be roughly divided into two types: laser heat conduction welding and laser deep penetration welding according to the different heat conduction mechanisms of welding. When the laser heat input exceeds a certain th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/70
CPCB23K26/06B23K26/24B23K2101/18B23K2103/14
Inventor 王宏宇程满周建忠黄舒黎向锋金镜孙崇超晁栓吴天成佘杰
Owner 佛山市金晓宝净化彩板有限公司
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