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Pulse laser welding method and device assisted by electromagnetic force

A laser welding and auxiliary pulse technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of poor laser welding effect, enlarged welding heat affected zone, decreased weld toughness, etc. Inhomogeneity and stress concentration, improving comprehensive mechanical properties, and suppressing welding porosity

Active Publication Date: 2015-11-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods currently have problems such as inability to completely eliminate porosity, low porosity elimination efficiency, or enlargement of the welding heat-affected zone, absorption of other gases, and a decrease in weld toughness.
[0008] At present, the methods to solve the problem of uneven laser deep penetration welding mainly include: using periodic pulsed laser to periodically input energy into the molten pool to form a periodic temperature gradient, under the action of this gradient, tension differences are generated. The molten pool is stirred evenly; in this method, the control of pulse modulation is difficult, especially for the laser welding of dissimilar materials, the proven effect is very poor

Method used

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  • Pulse laser welding method and device assisted by electromagnetic force
  • Pulse laser welding method and device assisted by electromagnetic force
  • Pulse laser welding method and device assisted by electromagnetic force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, an electromagnetic force-assisted pulse laser welding device includes a laser generator 1, an optical transmission system 12, an optical focusing system 11, a clamping workbench 6, a protective gas supply device, a control system 3, and a pulse current generator 2. Electromagnetic conversion equipment 5, a high-speed camera 4 for collecting workpiece surface images, the laser generator 1, the pulse current generator 2, the high-speed camera 4, and the clamping workbench 6 are respectively connected to the control system 3, and the The laser generator 1 is connected to the optical focusing system 11 through the optical transmission system 12, the pulse current generator 2 is connected to the electromagnetic conversion device 5, the electromagnetic conversion device 5 is arranged under the workpiece 8, and the protective gas The gas supply port of the supply equipment is set at the welding seam of the workpiece 8, and the optical focusing system...

Embodiment 2

[0067] The welding equipment is as embodiment 1, and the welding method is specifically:

[0068] In this case, DISC laser pulse welding is used. According to the area change of the plasma binary map, when the welding pulse is about to end, that is, when the plasma area is 1 / e of the peak value of the plasma area during welding, the electromagnetic field is coupled to make the liquid metal generate electromagnetic force and accelerate Fills the "keyhole" and creates a uniform texture.

[0069] The thickness of the welded workpiece is 4mm6061 aluminum alloy plate, the welding process is butt welding, the distance between the welds is less than 0.05mm, the butt penetration is required to be greater than 2mm and penetration welding is not required, and the porosity is required to be less than 0.5%. A 7KW DISC laser is used for welding, modulated by a half-period sine wave with 6KW peak power at 100Hz, the interval between pulses is 10ms, the pulse width is 8ms, the spot diameter ...

Embodiment 3

[0075] The welding equipment is as embodiment 1, and the welding method is specifically:

[0076]In this case, 3KW semiconductor laser λ=915~940nm pulse welding is used. According to the change of the area of ​​the plasma binary map, when the welding pulse is about to end, that is, when the plasma area is 1 / e of the peak value of the plasma area during welding, the electromagnetic field is coupled to make the liquid state The metal creates an electromagnetic force that accelerates the filling of the "keyhole" and creates a homogeneous structure.

[0077] The thickness of the welded workpiece is 2mm5052 aluminum alloy plate, the welding process is butt welding, the weld spacing is less than 0.05mm, butt welding is required, the penetration depth is 1±0.2mm, and the porosity is required to be less than 0.5%. 3KW semiconductor laser λ=915~940nm pulse welding is used for welding, the spot diameter is about 1.3mm, modulated by a triangle wave with 2.4KW peak power at 100Hz, after t...

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Abstract

The invention discloses a pulse laser welding method assisted by electromagnetic force. The method includes the following steps that step1, a workpiece to be machined is fixed; step2, a pulse laser is adopted for welding weld seams on the surface of the workpiece under protection of protective gas, the plasma area of the surface of the workpiece is acquired, and the power of the pulse laser is gradually reduced within one pulse width or in the middle-later period of one pulse width; step3, supposing that the time when the plasma area of the surface of the workpiece is reduced to 1 / e of the maximum plasma area in welding in the pulse laser application process is t, a magnetic field is applied to the workpiece at any moment from t to t+1 ms, wherein the intensity of the magnetic field is 0.1-10 T, and the duration of the magnetic field is 1-100 ms. By means of the pulse laser welding method assisted by electromagnetic force, the comprehensive mechanical properties of a welded joint can be significantly improved. The invention further provides a welding device adopting the welding method.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an electromagnetic force assisted pulse laser welding method and a welding device. Background technique [0002] Welding is one of the most important material forming techniques in modern manufacturing. As a new welding technology, laser welding has been paid more and more attention due to its advantages of high energy density, fast welding speed, large penetration depth, small heat-affected zone, good weld shape, and easy automatic control. Widely used in aerospace, weapon manufacturing, shipbuilding, automobile manufacturing, microelectronics manufacturing, pressure vessel manufacturing, civil and medical applications, etc. [0003] With the development of high-power lasers, laser deep penetration welding technology is more and more widely used in the industrial field, and the penetration depth of laser welding is further increased. However, laser deep penetration welding, es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/12B23K26/70
CPCB23K26/123
Inventor 郭亮眭敏张庆茂许建波王业伟
Owner SOUTH CHINA NORMAL UNIVERSITY
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