Focus point control laser welding method

A technology of laser welding and focus, which is applied in the direction of laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of reducing welding penetration, laser energy density, and weld penetration, etc., to achieve compensation for dimensional tolerances and improve Tolerance, the effect of increasing penetration

Inactive Publication Date: 2018-06-08
GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, laser welding requires extremely high assembly accuracy of the workpiece. When the assembly accuracy is not up to the requirement, resulting in too large gap between the workpieces, the laser will directly pass through the gap, resulting in poor welding defects. At present, the main methods are to increase the spot diameter or The double-beam method is used to solve this problem. However, increasing the spot diameter to achieve the same penetration requires increasing the corresponding laser power, resulting in high equipment costs. Double-beam laser

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  • Focus point control laser welding method

Examples

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Example Embodiment

[0027] Example 1:

[0028] The Nd:YAG continuous laser is used for laser welding of 00Cr17Ni14Mo2 steel with a thickness of 6mm, the laser power is 4kW, the welding speed is 72m / h, and the defocus of the focus balance position is -1.2mm, image 3 Middle a is the cross-sectional view of the focal vertical vibration laser welding joint, the vertical vibration frequency is 500Hz, the amplitude is 1.5mm, and the diameter of the filler wire is 1mm; image 3 The middle b is the cross-sectional view of the laser welding joint without vertical vibration and lateral oscillation at the focus. In the two cases, it can be seen that in the case of focus vertical vibration laser welding, the penetration depth increases, indicating that the absorption rate of the steel to the laser is increased.

Example Embodiment

[0029] Example 2:

[0030] Nd:YAG continuous laser is used for laser welding of 1560 aluminum alloy with thickness of 5mm. The laser power is 2.5kW, the welding speed is 60m / h, and the defocus of the focus balance position is -2mm. Figure 4 Middle a is the cross-sectional view of the laser welded joint without vertical vibration and lateral oscillation of the focus; Figure 4 The middle b is a cross-sectional view of a laser welded joint with focus vertical vibration and lateral oscillation. The lateral oscillation frequency is 50 Hz, the oscillation amplitude is 1 mm, the vertical oscillation frequency is 500 Hz, and the amplitude is 1.5 mm. It can be seen in both cases, Figure 4 The joint penetration in a is less than Figure 4 The joint penetration in b indicates that for aluminum alloys, a reasonable adjustment of the frequency and amplitude of the vertical vibration and lateral oscillation of the focus is beneficial to increase the penetration.

Example Embodiment

[0031] Example 3:

[0032] Use Nd:YAG continuous laser to laser welding 8mm thickness TC4 titanium alloy, laser power is 4kW, welding speed is 30m / h, Figure 5 In the middle a is the cross-sectional view of the laser welded joint with vertical vibration and lateral oscillation of the focal point. The vertical vibration frequency of the focal point is 500Hz, the amplitude is 1.5mm, the lateral oscillation frequency is 30Hz, and the oscillation amplitude is 1.5mm; Figure 5 The middle b is the cross-sectional view of the laser welded joint without vertical vibration and lateral oscillation of the focus. In both cases, it can be seen that in the case of focus vertical vibration and lateral oscillation laser welding, the penetration depth increases, indicating that the absorption rate of the titanium alloy to the laser is increased.

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Abstract

The invention discloses a focus point control laser welding method. In the welding process, focus points of laser beams are vertically vibrated while the focus points transversely swing relative to awelding workpiece, the vibration frequency is 100-500 Hz, the amplitude is 0.3 time smaller than the thickness of the welding workpiece, the swing frequency is 10-500 Hz, and the swing amplitude is 0-1.5 mm. By means of the focus point control laser welding method, since the laser welding method of vertically vibrating the focus points while transversely swinging the focus points in the welding process is adopted, by adjusting the amplitudes and frequencies of vertical vibration and transverse swing, the purposes that the workpiece dimension tolerance of the workpiece is compensated, the butt-joint interstice tolerance is improved, and the fusion depth of welding joints is increased are effectively achieved, and the power needed in the welding process is lowered.

Description

technical field [0001] The invention relates to a laser welding method for metal material workpieces, in particular to a focus control laser welding method applicable to the fields of welding longitudinally welded pipelines, railway passenger cars, sea ships and the like. Background technique [0002] Laser welding has outstanding advantages such as high energy density, fast welding speed, large weld depth-to-width ratio, good joint performance, and small deformation of the welded structure. With the development of industrial lasers, especially the application of high-power fiber lasers, laser welding technology has also been more and more widely used. However, laser welding requires extremely high assembly accuracy of the workpiece. When the assembly accuracy is not up to the requirement, resulting in too large gap between the workpieces, the laser will directly pass through the gap, resulting in poor welding defects. At present, the main methods are to increase the spot di...

Claims

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Application Information

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IPC IPC(8): B23K26/04B23K26/12B23K26/21
CPCB23K26/04B23K26/123B23K26/21
Inventor 哈斯金·弗拉基斯拉夫罗子艺郭瑞·弗拉基米尔陈永城舍甫琴科·维塔利董春林韩善果蔡得涛王昕昕
Owner GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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