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

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...

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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 laser beam moves relative to the workpiece, if the position of the electrode to which the current is applied is relatively stationary with the workpiece, the molten pool only occupies a small part of the conductor. Part of the current does not pass through the molten pool, which is not conducive to the increase of current density, which will greatly reduce the actual effect of the current

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