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Double-beam parallel laser welding device and method for T-joint lap welding

A technology of laser welding and welding method, which is applied in the field of double-beam parallel laser welding devices for T-joint lap welding, which can solve the problems of keyhole front wall collapse and increase in the number of weld seam pores, and increase the weld seam lap Area, reduce welding bubbles, improve the effect of shear strength

Active Publication Date: 2022-05-17
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the front wall of the keyhole collapses and the number of weld pores increases due to the gap between the face plate and the web cutting off the continuity of the molten pool during laser welding of T-shaped lap joints, the invention provides a T-shaped lap joint A double-beam parallel laser welding device and method is used. In this method, two laser beams are set before and after, and the two laser beams are divided into two parallel laser beams by a beam splitter. There is a gap between the two parallel laser beams formed by the same laser beam. When it is on the panel, a diffused keyhole is formed. While increasing the opening size of the keyhole, it is beneficial to improve the stability of the keyhole, and it also increases the overlap area of ​​the weld seam and improves the resistance of the T-shaped lap joint. Shear strength

Method used

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  • Double-beam parallel laser welding device and method for T-joint lap welding
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  • Double-beam parallel laser welding device and method for T-joint lap welding

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a double-beam parallel laser welding device for T-joint lap welding, the T-joint is formed by lapping a vertical web 8 and a panel 7 horizontally arranged on the web 8, and on the web There is a gap between the board 8 and the panel 7, and the double-beam parallel laser welding device includes two laser emitters, two beam splitters 9 and a shielding gas spray head 6, wherein the two laser emitters are placed one behind the other along the welding direction after setting;

[0033] The laser beam emitted by the laser emitter at the front is divided into two parallel front laser beams 1 by a beam splitter 9, and the two laser spots formed on the panel 7 by the two parallel front laser beams 1 melt the panel 7 to form a front Keyhole 3, and the energy of the front laser beam 1 is not enough to support it to melt the web 8;

[0034] The laser beam emitted by the laser transmitter at the rear is divided into two parallel rear laser beams 2 by anot...

Embodiment 2

[0045]This embodiment is for the limitation of the placement positions of the two laser emitters and the beam splitter 9 in the double-beam parallel laser welding device. The positions of the two laser emitters can make the front laser beam 1 and the rear laser beam The distance between 2 is 0.5-2.0mm, and the placement position of the two beam splitters 9 can make the distance between the laser spots formed by the two front laser beams 1 be 0.05-0.3mm, and the distance between the laser spots formed by the two rear laser beams 2 is 0.05-0.3mm.

Embodiment 3

[0047] The present embodiment is a further limitation on the arrangement position of the two beam splitters 9 in the double-beam parallel laser welding device. After the beam splitter 9 is placed, the energy ratio of the two front laser beams 1 that can be divided into two beams is 1: 1. The energy ratio of the laser beam 2 after the two beams is also 1:1.

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Abstract

A double-beam parallel laser welding device and method for T-joint lap welding, including two laser emitters arranged one behind the other along the welding direction; the laser beam emitted by each laser emitter is divided into two beams by a beam splitter Parallel laser beams, the two laser spots of the two parallel laser beams in the front melt the panel to form a keyhole, and its energy is not enough to support it to melt the web, and the spots of the rear laser beam melt the panel and form a keyhole on the web A rear keyhole is formed on the top. The invention divides the laser beam into two parallel laser beams through a beam splitter, and the spots formed by the two beams of laser light on the panel have gaps, and when irradiated on the panel, a diffused keyhole is formed, and the opening size of the keyhole is increased at the same time , which is beneficial to improve the stability of the keyhole and reduce the generation of welding bubbles; at the same time, the double-beam parallel laser beams can increase the weld lap area of ​​the T-shaped lap joint and improve the shear strength of the T-shaped lap joint.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a double-beam parallel laser welding device and method for lap welding of T-shaped joints. Background technique [0002] In recent years, T-lap welding technology has been applied in aerospace, navigation and other fields. Laser welding has been widely used in the welding of T-shaped lap joints due to its advantages of fast welding speed, small stress and deformation. Laser welding of T-shaped lap joints, the process is to select a panel and a web to overlap to form a T-shaped, and then apply the laser heat source to the panel to melt and penetrate the panel material in the action area, and further The web is partially melted, and the face plate and the web are melted and combined to form a T-shaped lap joint after cooling and solidification. [0003] Dr. Meng Wei of Shanghai Jiaotong University's doctoral thesis "Research on the Dynamic Process and Forming Characteristics of Laser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/24B23K26/067B23K26/14
CPCB23K26/24B23K26/067B23K26/14
Inventor 彭进
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER