Pulse electric field-traveling wave magnetic field composite method for reducing cracks of cladding layer

A technology of traveling wave magnetic field and pulsed electric field, which is applied in the field of material surface modification, can solve the problems of not considering the cladding speed of laser cladding and the short existence time of molten pool, and achieve the increase of pore rising and escape time and the number of crystal nuclei Increase, the effect of particle charging ability enhancement

Pending Publication Date: 2019-12-03
魏永强
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Through the search of domestic and foreign literature, current researchers mainly focus on applying magnetic or electric fields to welding or laser cladding, but they do not take into account the unique characteristics of laser cladding, such as fast cladding speed and short existence time of molten pool.

Method used

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  • Pulse electric field-traveling wave magnetic field composite method for reducing cracks of cladding layer
  • Pulse electric field-traveling wave magnetic field composite method for reducing cracks of cladding layer
  • Pulse electric field-traveling wave magnetic field composite method for reducing cracks of cladding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Fix Q235 (chemical composition percentage Wt%: 0.5Mn, 0.3Si, 0.2C, 0.05S, 0.045P, Fe balance) substrate plate with a size of 100mm*20mm*20mm (length*width*height) Place it on the workbench, fine-tune the relative position of the electrode substrate and the numerical control device, so that the focus of the laser beam is located at the center of the rectangular through hole. Adjust the position of the connecting lug so that the distance between the two electrode rollers is d 1 25mm, adjust the position of the fastening nut on the electrode column, so that the electrode roller is pressed against the upper surface of the substrate;

[0030] 2. Turn on the positive and negative pulse electric field power switch, so that the amplitude of the positive and negative pulse current passing through the workpiece is ±5kA, and the period T is 0.008s. After the positive and negative pulse current output by the electric field device is stable, turn on the traveling wave magnetic fi...

Embodiment 2

[0033] Method is all identical with embodiment 1, only embodiment 1 the 1st walking wave magnetic field power source control device makes each phase energization frequency be 80Hz, each phase energization current i A (or i B i C ) for 3A.

Embodiment 3

[0035] The method is the same as that of Example 1, only the second step of Example 1 makes the amplitude of the positive and negative pulse current passing through the workpiece be ±8kA, the period T is 0.008s, and the traveling wave magnetic field power supply control device makes the energization frequency of each phase be 80Hz, and each phase is connected electric current i A (or i B i C ) for 3A.

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Abstract

The invention discloses a pulse electric field-traveling wave magnetic field composite method for reducing the cracks of a cladding layer. The devices used in the method comprise a laser cladding numerical control device, a traveling wave magnetic field device and a positive and negative pulsed electric field device. During the cladding process, a traveling wave magnetic field is applied to a molten pool, so that the charged quantity of the non-magnetic particles and the charged particles in the molten pool is increased under the action of impressed current, the liquid metal particles are remarkably enhanced in Lorentz force in an external follow-up traveling wave magnetic field, the stirring effect on a molten pool is enhanced, the effects of fluid scouring, crushing and the like on dendrites are increased, the grain size is reduced, the fine grain strengthening effect is obvious, the defects, such as air holes, inclusions, component segregation, etc., are reduced, and the crack generation probability of a cladding layer is reduced. The composite device effectively solves the problems that the non-magnetic and charged particles are subjected to small Lorentz force in an electromagnetic field, and the electromagnetic stirring effect of the magnetic field on the molten pool is small.

Description

technical field [0001] The invention is a composite device that enhances the strong stirring effect of the traveling wave magnetic field on the molten pool by applying positive and negative pulse currents to the liquid molten pool, which can greatly improve the cladding quality and reduce cladding layer defects (such as pores, inclusions, cracks, etc.) The production belongs to the field of material surface modification. Background technique [0002] Laser cladding technology and 3D printing technology are new technologies that have developed rapidly in industry in recent years. What both have in common is that they use a high-density laser beam to irradiate the powder near the focus of the laser beam for a short time to partially melt it and the upper surface of the substrate and cool it rapidly, which can be obtained on a substrate with good plasticity and toughness. Alloy cladding layer with high strength, hardness and excellent wear resistance. Since the physical and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 王好平魏永强李志森侯军兴刘源张华阳蒋志强
Owner 魏永强
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