Laser cladding device for self-healing of cracks of cladding layer and processing method of laser cladding device

A technology of laser cladding and processing method, applied in the direction of metal material coating technology, coating, etc., can solve the problems of reducing the actual effect of current, unfavorable current density, increase, etc., to improve cladding efficiency, reduce cracking sensitivity, The effect of uniform cladding layer structure

Active Publication Date: 2019-11-15
TONGLING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still few studies on the influence of pulse current on laser cladding. At present, some researchers have studied the influence of pulse current on laser cladding and found that it has the effect of refining the structure.
However, the position of the electrode in the experimental device is fixed. Considering that during the laser cladding process, the position of the la

Method used

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  • Laser cladding device for self-healing of cracks of cladding layer and processing method of laser cladding device
  • Laser cladding device for self-healing of cracks of cladding layer and processing method of laser cladding device
  • Laser cladding device for self-healing of cracks of cladding layer and processing method of laser cladding device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as Figure 1-3As shown, a laser cladding device for self-healing cracks in the cladding layer 34 includes a laser cladding mechanism and a pulse current mechanism. The laser cladding mechanism is arranged above the workbench 3, including The fixed seat 1 and the laser head 2 connected with the fixed seat 1, the laser head 2 is used to emit the laser beam 21, and perform laser cladding on the substrate 32 and the cladding layer 34, and the input end of the laser head 2 is also provided with There is a powder feeder 23, and the powder feeder 23 is used for conveying the powder body 33 to the surface of the base body 32, so that the powder conveying and cladding of the cladding layer 34 can be carried out simultaneously during the laser cladding process.

[0045] The pulse current mechanism includes adjustable electrode assemblies respectively arranged at both ends of the laser cladding mechanism, and the adjustable electrode assembly is connected to the fixed seat 1 ...

Embodiment 2

[0056] This embodiment adopts the laser cladding device for self-healing of cladding layer cracks in the above-mentioned embodiment 1 to prepare Ni60A coating on the surface of 42CrMo substrate, including the following steps:

[0057] Step S1: Select YLS-6000 high-power fiber laser produced by German IPG company and XSL-PF-01B-2 double-silo negative pressure coaxial powder feeder, and carry out coaxial powder feeding laser melting on the surface of 42CrMo alloy structural steel substrate Cover with Ni60A coating, place the insulating plate and the 42CrMo alloy structural steel substrate on the worktable in sequence, and adjust the positions of the pulse current mechanism, the laser cladding mechanism and the workbench;

[0058] Step S2: Set the laser cladding process parameters as follows: spot diameter is 5mm; laser power is 2000W; scanning speed is 5mm s -1 ; Powder feeding rate is 25g·min -1 ;Argon gas is used to protect the molten pool, and the carrier gas volume is 8L mi...

Embodiment 3

[0061] This embodiment is to prepare the MCrAlY coating on the surface of the GH4169 substrate using the laser cladding device for the self-healing of the cladding layer cracks in the above-mentioned embodiment 1, including the following steps:

[0062] Step S1: Select the 3710 atmospheric plasma spraying system produced by Praxair in the United States to spray the MCrAlY bonding layer on the GH4169 substrate. In terms of mass percentage, the composition of the MCrAlY powder is: Ni-20Co-18Cr-15Al-2Y 2 o 3 ; Place the insulation board and the GH4169 substrate in turn on the workbench, and adjust the positions of the pulse current mechanism, the laser cladding mechanism and the workbench;

[0063] Step S2: Select SLCF-X12×25 CO 2 The laser processing machine performs laser cladding, and the laser cladding process parameters are set as the optical power is 850W, the spot diameter is 3mm, and the laser scanning speed is 600mm min -1 , when remelting, blow argon to protect the mo...

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Abstract

The invention relates to a laser cladding device for self-healing of cracks of a cladding layer and a processing method of the laser cladding device. The device comprises a laser cladding mechanism and a pulse current mechanism, wherein the laser cladding mechanism comprises a fixing seat and a laser head which are arranged above a workbench; and the pulse current mechanism comprises adjustable electrode assemblies which are respectively arranged at two ends of the laser cladding mechanism, and the adjustable electrode assemblies are connected with the fixing seat through adjustable connectingpieces. By arrangement of the pulse current mechanism, the cladding efficiency is improved, crystal grains of the cladding layer can be refined, the porosity of the cladding layer is reduced, the structure of the cladding layer is uniformized, meanwhile, the residual thermal stress and the cracking sensitivity of the cladding layer can be reduced, particularly, on-line self-healing of the cracksof the cladding layer can be realized due to a flow-around effect and a Joule thermal effect formed at the tips of the cracks of the cladding layer due to the pulse high current density, and a high-quality and high-performance laser cladding layer can be prepared.

Description

technical field [0001] The invention belongs to the technical field of laser processing equipment, and in particular relates to a laser cladding device for self-healing cracks in a cladding layer and a processing method thereof. Background technique [0002] Laser cladding is a complex physical, chemical and metallurgical process, due to its rapid heating and solidification process characteristics (rapid heat and rapid cooling), coupled with the physical properties of cladding layer materials and substrates (such as thermal expansion coefficient, elastic modulus and The difference in thermal conductivity, etc.) directly leads to the residual internal stress in the cladding layer and between the cladding layer and the substrate. Stress concentration occurs in other places, which leads to cracking of the cladding layer. [0003] In order to obtain laser cladding coatings with good quality, few defects or even no defects, on the one hand, the theoretical basis of laser claddin...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/10Y02P10/25
Inventor 王东生周杏花季燕王松林李杰
Owner TONGLING UNIV
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