Metal surface alloying method for promoting molten pool convection by non-uniform heat sources

A metal surface and alloying technology, which is applied in metal processing equipment, welding equipment, laser welding equipment, etc., can solve the problems of poor metal surface alloying effect, achieve the effect of optimizing alloy composition, ensuring metal surface quality, and promoting convection

Active Publication Date: 2021-03-19
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a metal surface gas alloying method in which a non-uniform heat source promotes convection of the molten pool to solve the problem of poor metal surface alloying effect existing in the prior art

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  • Metal surface alloying method for promoting molten pool convection by non-uniform heat sources

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experiment example

[0025] The experiment was carried out by laser gas nitriding of pure titanium metal surface. During the test, the parameters are: the first laser beam is a fiber laser, and the laser generator is a laser generator of the model YLS4000 produced by IPG Company in Germany. Laser wavelength: 1064nm, focal plane beam diameter is 3mm, laser beam defocus is 0mm, and laser beam-to-mouth distance is 30mm. Laser beam moving speed: 30mm / s, power 1400W, maximum power density at center point: 5.94*10 4 W / cm 2 , the average power density is about: 1.98*10 4 W / cm 2 . The second laser beam is fiber laser, and the laser generator adopts the laser generator of model YLS4000 produced by IPG Company of Germany. Laser wavelength: 1064nm, focal plane beam diameter is 3mm, laser beam defocus is 0mm, and laser beam-to-mouth distance is 30mm. Laser beam moving speed: 30mm / s, power 3200W, maximum power density at the beam center: 1.36*10 5 W / cm 2 , the average power density is about: 4.53*10 4...

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Abstract

The invention relates to a metal surface alloying method for promoting molten pool convection by adopting non-uniform heat sources. The method comprises the following steps that 1) a metal surface isheated by adopting a first heat source and molten to form a molten pool; 2) alloying gas enters the molten pool to carry out reaction to generate a high-melting-point compound, the compound has the tendency of solidifying to form a solidified layer, an area where the compound is located is heated by adopting a second heat source, it is guaranteed that the compound is not solidified, convection ofthe molten pool is promoted, an alloyed layer uniform in component and structure is formed, the first heat source and the second heat source are sequentially arranged in a heat source moving direction, and the power density of the second heat source is larger than that of the first heat source; and 3) the first heat source and the second heat source integrally move along the heat source moving direction, and the molten pool is solidified to form an alloyed layer. According to the method, laser gas alloying is carried out on the metal surface by adopting the non-uniform heat sources, and finally the alloyed layer with good structure and performance is obtained.

Description

technical field [0001] The invention relates to the technical field of metal surface laser gas alloying, in particular to a metal surface gas alloying method in which a non-uniform heat source promotes convection of a molten pool. Background technique [0002] During the fusion welding process, there is a large temperature gradient on the surface of the molten pool, resulting in a large surface tension gradient on the surface of the molten pool, which in turn drives the formation of Marangoni convection in the molten pool. Convection promotes the homogenization of components in the molten pool and optimizes the structure and properties of the weld. [0003] Laser gas alloying of metal surfaces can improve metal surface properties. The process engineering is divided into three stages: the first stage, the laser heats the metal, and the metal surface melts to form a molten pool; the second stage, the alloying gas enters the molten pool, and the molten pool reacts; the third s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/354
CPCB23K26/354
Inventor 石玗郭晋昌顾玉芬朱明张刚李春凯
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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