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A Fiber Laser Welding Method for Reducing Welding Spatter

A fiber laser, welding method technology, applied in laser welding equipment, welding/welding/cutting items, welding equipment, etc., to achieve the effects of improving stability, improving welding quality, and reducing welding spatter

Active Publication Date: 2017-05-03
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reducing spatter in fiber laser welding to solve the problem of spatter in existing relatively slow high-power fiber laser welding

Method used

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  • A Fiber Laser Welding Method for Reducing Welding Spatter
  • A Fiber Laser Welding Method for Reducing Welding Spatter
  • A Fiber Laser Welding Method for Reducing Welding Spatter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For high-strength steel with a thickness of 20mm and 600MPa grade, that is, the workpiece 5, the fiber laser welding method of the present invention is adopted, wherein the laser power of the fiber laser 1 is modulated into a triangular wave pulse, the pulse peak power is 7kW, the base value power is 3kW, the pulse frequency is 15-125Hz, and the triangular wave pulse The pulse rise time is 5 ms, the flow rate of the argon shielding gas is 15 L / min, the angle 3 between the shielding gas nozzle and the laser beam axis 6 is 45°, and the distance 4 between the shielding gas nozzle 2 and the workpiece 5 is 15mm, welding speed 1.0m / min. When the pulse frequency is 15-125Hz, the spatter particles attached to the surface of the fiber laser welding seam are less and small (such as Figure 4 Shown), while the optical fiber laser welding method with unmodulated power in the comparison method, the force of the metal vapor eruption in the small hole makes the molten pool at the fron...

Embodiment 2

[0044] For low-carbon steel with a thickness of 15mm, i.e. workpiece 5, the fiber laser welding method of the present invention is adopted, wherein the laser power of laser 1 is modulated into a triangular wave pulse, the pulse peak power is 7kW, the base value power is 3kW, the pulse frequency is 60Hz, and the rising edge of the triangular wave pulse The time is 5ms, the flow rate of the helium shielding gas is 45L / min, the angle 3 between the shielding gas nozzle 2 and the laser beam axis 6 is 40°, and the distance 4 between the shielding gas nozzle 2 and the workpiece 5 is 12mm. The welding speed is 1.0m / min. The weight loss of fiber laser welding with triangular wave pulse modulation is 0.29g, while the fiber laser welding method with unmodulated power of the comparison method has a weight loss of 0.53g. Using triangular wave pulse modulation, fiber laser welding spatter is greatly reduced, and weight loss is significantly reduced.

Embodiment 3

[0046]For 12mm thick 780MPa high-strength steel, that is, workpiece 5, the fiber laser welding method is adopted, in which the laser power of laser 1 is modulated into a triangular wave pulse, the pulse peak power is 5kW, the base value power is 2kW, the pulse frequency is 100Hz, and the rising edge time of the triangular wave pulse is 5ms. The flow rate of the argon shielding gas 2 is 10L / min, the angle 3 between the shielding gas nozzle 2 and the laser beam axis 6 is 45°, the distance 4 between the shielding gas nozzle 2 and the workpiece 5 is 10mm, and the welding speed 0.5m / min. The weight loss of fiber laser welding with triangular wave pulse modulation is 0.42g, while the fiber laser welding method with unmodulated power of the comparison method has a weight loss of 0.65g. Using triangular wave pulse modulation, fiber laser welding spatter is greatly reduced, and weight loss is significantly reduced.

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Abstract

The invention belongs to the technical field of laser welding, and particularly relates to an optical fiber laser welding method for reducing welding spatter. The method adopts triangular-wave pulses to modulate laser power, wherein pulse peak-value power is 5-10kW; basic-value power is 2-4kW; pulse frequency is 15-125Hz; and triangular-wave pulse rising time is 3-7ms. According to the optical fiber laser welding method, by modulating the laser power, laser keyhole stability is improved and welding spatter is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser welding, in particular to an optical fiber laser welding method for reducing welding spatter. Background technique [0002] During laser deep penetration welding, the laser irradiance is greater than 10 6 W / cm 2 , The material is rapidly melted and vaporized under the action of a high-energy-density laser beam to form laser holes. Due to the existence of small holes, the laser beam energy can penetrate deep into the material to form a deep and narrow weld, so laser deep penetration welding is considered to be an ideal welding method. [0003] As a new generation of laser, fiber laser has the advantages of high electro-optic conversion efficiency, better beam quality and lower operating costs. Fiber laser deep penetration welding has received more and more attention and application. However, the formation of welding defects is one of the main problems in fiber laser deep penetration welding, in wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/0622B23K26/12B23K26/24B23K101/18B23K103/04
CPCB23K26/123B23K26/24B23K2101/18B23K2103/04
Inventor 赵琳田志凌彭云马成勇肖晓明
Owner CENT IRON & STEEL RES INST
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