Method for repairing metal surface micro-cracks based on laser micro-fusion

A metal surface, micro-crack technology, applied in laser welding equipment, metal processing equipment, welding equipment and other directions, can solve the problems affecting the effect of crack repair, physical property mismatch, etc., to achieve high production efficiency, saving resources and costs, no Effects of Environmental Pollution

Inactive Publication Date: 2017-07-18
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

The above method for repairing cracks has certain requirements on the size. The size of the cracks is limited to a certain extent by the particles of microcapsules or cladding powders, and the size of the cracks is required to be larger than the size of the microcapsules or the size of the powder particles. Microcapsules or powder particles may not be the same material as the raw material. After being combined with the base material, there will be a problem of physical property mismatch, which will affect the effect of crack repair

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  • Method for repairing metal surface micro-cracks based on laser micro-fusion
  • Method for repairing metal surface micro-cracks based on laser micro-fusion
  • Method for repairing metal surface micro-cracks based on laser micro-fusion

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0022] A method for bridging microcracks on the metal surface by laser micro-melting according to the present invention is: use a long pulse laser beam or a continuous laser beam with a pulse width greater than 100 microseconds to scan the microcrack area on the surface of the metal workpiece, and the size of the microcracks is between At the nanometer or micrometer level, the thermal effect of the laser is used to slightly melt the microcrack area on the surface of the metal workpiece to form a metal liquid. The metal liquid flows, flows into the microcrack area and then solidifies, thereby achieving the effect of bridging the cracks on the metal surface. The average power density of the laser beam should be in the range of 1*10^5W / cm^2 to 10*10^5W / cm^2 to ensure that the...

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Abstract

The invention provides a method for repairing metal surface micro-cracks based on laser micro-fusion and belongs to the field of laser processing. The surface of a metal workpiece is scanned by using long-pulse laser or continuous laser beams, micro-melting is carried out on a micro-crack zone by utilizing the heat effect of the laser, and micro-molten metal liquid flows and is condensed after flowing across the micro-crack zone, so that an effect of repairing the metal surface micro-cracks is realized. The method for repairing the metal surface micro-cracks based on laser micro-fusion does not require extra materials, and is simple in technology, convenient to operate, high in production efficiency, free of environmental pollution, easy for the realization of automatic production and favorable for massive popularization in the industry.

Description

technical field [0001] The invention relates to the field of laser micromachining, in particular to a method for bridging microcracks on metal surfaces by laser microfusion. Background technique [0002] During the processing or use of metal parts, due to the characteristics of the material itself, stress, corrosion, wear, etc. during the processing or use, the surface of the workpiece produces microcracks with a size of nanometers or micrometers. For example: cemented carbide is brittle, and its own hardness is high, and microcracks are prone to occur on the surface during the process of being processed into a tool, thereby affecting the service life of the tool; the blades of steam turbines or water turbines are impacted by fluids during work, and long-term operation Finally, fatigue cracks will appear on the blade surface. In the past, these parts with microcracks were either scrapped and discarded, or continued to be used with "injuries" until they were completely unusa...

Claims

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Application Information

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IPC IPC(8): B23K26/354
CPCB23K26/354
Inventor 叶云霞陈美左慧康正阳任旭东
Owner JIANGSU UNIV
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