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Laser welding method

A laser welding and laser technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of small joint area and low strength

Inactive Publication Date: 2019-03-01
HANS LASER TECH IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a laser welding method for the problems of small bonding area and low strength of the traditional laser welding head

Method used

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Examples

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Effect test

Embodiment 1

[0064] In this example, laser welding is carried out for SUS316 stainless steel with a thickness of 4.0mm. Before welding, the surface of the material is cleaned with alcohol, and then the workpiece is fixed with a clamp. The workpiece is welded in a way that the beam does not swing. The laser power used is 300W, the welding speed is 20mm / s, and the welding is performed at the focal point. The coaxial direct blowing shielding gas is used. The shielding gas is pure argon, and the gas flow rate is 15L / min. After welding, make metallographic observation and measure the cross section of weld seam. The test results are as follows: Figure 5 As shown, the weld cross section is Y-shaped, the weld penetration depth is 1.65mm, the fusion width is 0.64mm, and the weld waist length is small.

Embodiment 2

[0066] In this example, laser welding is carried out for SUS316 stainless steel with a thickness of 4.0mm. Before welding, the surface of the material is cleaned with alcohol, and then the workpiece is fixed with a clamp. The workpiece is welded in the way of linear swing, the swing amplitude is 0.2mm, the swing frequency is 1000Hz, the laser power used is 900W, the welding speed is 20mm / s, the welding is at the focus position, and the coaxial direct blowing shielding gas is used, and the shielding gas is pure argon. The air flow is 15L / min. After welding, make metallographic observation and measure the cross section of weld seam. The test results are as follows: Figure 6 As shown, the cross-section of the weld is rectangular, and the weld width is approximately equal to the waist length. The weld penetration depth is 1.57mm, the weld width is 1.39mm, and there are no pores, cracks and other defects inside the weld.

Embodiment 3

[0068] In this example, laser welding is carried out for SUS316 stainless steel with a thickness of 4.0mm. Before welding, the surface of the material is cleaned with alcohol, and then the workpiece is fixed with a clamp. The workpiece is welded in the way of linear swing, the swing amplitude is 0.1mm, the swing frequency is 1000Hz, the laser power used is 900W, the welding speed is 20mm / s, the welding is at the focal point, and the coaxial direct blowing shielding gas is used, and the shielding gas is pure argon. The air flow is 15L / min. After welding, make metallographic observation and measure the cross section of weld seam. The test results are as follows: Figure 7 As shown, the cross-section of the weld is inverted trapezoid, the weld penetration depth is 2.4mm, the fusion width is 1.29mm, and there are no pores, cracks and other defects inside the weld.

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Abstract

The invention relates to a laser welding method. The method comprises the steps that laser emitted by a single mode fiber laser device is subjected to shaping, a laser beam is obtained, and the laserbeam forms light spots with the diameter being 0.03 mm to 0.05 mm on the workpiece; the workpiece moves in the first direction, the light spots swing in the to-be-welded area of the workpiece in the second direction, the first direction and the second direction are perpendicular, and the amplitude of the light spots ranges from 0.08 mm to 0.3 mm. The laser welding method can obtain a welding linewith the section shape being a rectangle or trapezoid, and the welding line strength is higher.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser welding method. Background technique [0002] Usually, the fiber laser without beam shaping has a Gaussian distribution of energy. In the actual welding process, the weld seam shape obtained is generally a V-shaped or Y-shaped weld with a wide top and a narrow bottom, resulting in a limited welding range. , Joints such as lap joints and butt joints have small joint areas and low weld strength. Contents of the invention [0003] Based on this, it is necessary to provide a laser welding method for the problems of small bonding area and low strength of the traditional laser welding head. [0004] A laser welding method comprising: [0005] Reshape the laser emitted by the single-mode fiber laser to obtain a laser beam, and the laser beam can form a spot with a diameter of 0.03 mm to 0.05 mm on the workpiece; [0006] The workpiece moves along a first direction, an...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/06
CPCB23K26/06B23K26/21
Inventor 朱宝华孙子路李小婷王晖王瑾高云峰
Owner HANS LASER TECH IND GRP CO LTD
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