Seam-like welding-traveling wave-like magnetic field composite method for improving defects of cladding layer

A technology of traveling wave magnetic field and cladding layer, which is applied in the direction of coating, metal material coating process, etc., can solve the problems of short existence time of molten pool and does not take into account the cladding speed of laser cladding, and achieve fast cooling time, The effect of increasing the rise and escape time of the stomata and shortening the existence time

Pending Publication Date: 2019-12-03
魏永强
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  • Summary
  • 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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  • Seam-like welding-traveling wave-like magnetic field composite method for improving defects of cladding layer
  • Seam-like welding-traveling wave-like magnetic field composite method for improving defects of cladding layer
  • Seam-like welding-traveling wave-like magnetic field composite method for improving defects of cladding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. The Q235 (chemical composition percentage Wt% is: 0.5Mn, 0.3Si, 0.2C, 0.05S, 0.045P, Fe balance) substrate plate with a size of 100mm*20mm*20mm (length*width*height) is covered Fix it on the workbench, and 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 main power switch of seam welding, adjust the current and series of the primary side, so that the current i through the workpiece 1 It is 5kA to realize the preheating treatment of the substrate workpiece, measure the temperature of the substrate with an infrared thermometer, and when the temperature r...

Embodiment 2

[0033] Method is all identical with embodiment 1, only the 2nd walking wave magnetic field power source control device of embodiment 1 makes each phase energization frequency be 80Hz, each phase energization current i A (or i B i C ) for 3A.

Embodiment 3

[0035] The methods are all the same as in Example 1, only the second step of Example 1 passes the workpiece current i 1 is 8kA, the traveling wave magnetic field power supply control device makes the frequency of each phase energized at 80Hz, and the energized current of each phase i A (or i B i C ) for 3A.

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Abstract

The invention discloses a seam-like welding-traveling wave magnetic field composite method for improving the defects of a cladding layer. The adopted devices mainly comprise a laser cladding numericalcontrol device, a traveling wave magnetic field device and a seam-like welding device. According to the present invention, firstly, the seam-like welding device is started before cladding until the power is continuously supplied for a period of time after cladding is completed, and secondly, a traveling wave magnetic field is applied to a molten pool during the cladding process, so that the charged quantity of non-magnetic particles and particles with small charged quantity in the molten pool is increased under the action of impressed current, in an external follow-up traveling wave magneticfield, the Lorentz force borne by the liquid metal particles is remarkably enhanced, then the stirring effect of a molten pool is enhanced, the number of crystal grains is increased, the fine grain strengthening is remarkable, the cladding layer structure defects are reduced, and the quality is improved. According to the method, the problems that the non-magnetic particles with small electric charge amount are subjected to small Lorentz force in the electromagnetic field, and the electromagnetic stirring effect of a magnetic field on a molten pool is small are effectively solved, and meanwhilethe defects that in the prior art, the refining effect is not remarkable only by enhancing the magnetic induction intensity of the magnetic field, and the pre-heating before melting and slow coolingdevices after melting are needed to be additionally arranged, are overcome.

Description

technical field [0001] The present invention is a composite device that applies an AC electric field to the workpiece to be clad by a method similar to seam welding, thereby enhancing the strong stirring effect of the traveling wave magnetic field on the molten pool, which can greatly improve the cladding quality and reduce cladding layer defects (such as pores, The generation of inclusions, cracks, etc.) 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 of them have in common is the use of high-density laser beams 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. An alloy cladding layer with high strength, hardness and excellent wear resistance is obtained. Since the physical and chemical paramet...

Claims

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Application Information

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