Method for overlaying nitrogen-reinforced iron-base wear-resistant coating

A wear-resistant coating and iron-based technology, which is applied in the field of surfacing, can solve the problems of small and uneven distribution of wear-resistant hard phase volume fraction, low metal nitrogen content in the surfacing layer, and low hardness of the surfacing layer. Good formability, no porosity, and efficient transition effect

Inactive Publication Date: 2014-07-30
JIAMUSI UNIVERSITY
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Problems solved by technology

[0008] The present invention aims to solve the problems of low nitrogen content in the metal of the surfacing layer obtained by the existing nitrogen alloying surfacing method, small and uneven distribution of the volume fraction of the wear-resistant hard phase, and slightly low hardness of the surfacing layer, and provides a nitrogen Surfacing welding method for strengthening iron-based wear-resistant coating

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  • Method for overlaying nitrogen-reinforced iron-base wear-resistant coating

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specific Embodiment approach 1

[0023] Specific implementation mode one: The surfacing welding method of nitrogen-enhanced iron-based wear-resistant coating in this embodiment is carried out according to the following steps:

[0024] 1. Clean the rust and oil on the surface of the substrate, and put the substrate into the workbench of the surfacing welding machine;

[0025] 2. Pass the welding wire into the nozzle of the welding machine, use nitrogen as the protective gas, and the nitrogen flow rate is 15-20L min -1 , turn on the welding power supply, a high-temperature nitrogen arc is triggered between the welding wire and the base material, and at the same time, the alloy powder for surfacing welding is sent to the high-temperature nitrogen arc area through the nozzle of the welding machine for surfacing welding; the welding current is 140-260A, and the welding voltage 22~28V, the flow rate of powder feeding air is 0.8m 3 h -1 , the powder feeding speed is 50~60g / min;

[0026] The nozzle of the welding ...

specific Embodiment approach 2

[0029] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the base material in step 1 is carbon structural steel, and the carbon structural steel is carbon structural steel Q235, carbon structural steel 45 or carbon structural steel Structural steel 65Mn. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the nitrogen in step 2 is industrial nitrogen with a purity of 99.5%. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for overlaying a nitrogen-reinforced iron-base wear-resistant coating, relates to an overlaying method, and aims to solve the problems of low nitrogen content in metal of an overlaying layer obtained by using an existing nitrogen alloyed overlaying method, low wear-resistant hard phase volume fraction, non-uniform distribution and slightly low hardness of the overlaying layer. The method comprises the following steps: (1) removing rust and oil from the surface of a base material, and putting the base material into a working table of an overlaying machine; (2) conveying a welding wire into a spray head of the overlaying machine, turning on a welding power supply by using nitrogen as protection gas, striking a high-temperature nitrogen arc between the welding wire and the base material, and meanwhile, feeding alloy powder for overlaying into a high-temperature nitrogen arc area through the spray head of the overlaying machine for overlaying. According to the method, nitrogen elements can be efficiently transited into the metal of the overlaying layer; the content of the nitrogen elements in the obtained overlaying layer can reach 0.3-0.4 percent. The method is applicable to the field of overlaying.

Description

technical field [0001] The invention relates to a surfacing welding method. Background technique [0002] Metal wear is one of the main causes of failure of mechanical parts. According to incomplete statistics, the annual consumption of steel materials in the world is more than 700 million tons, of which 50% are consumed due to material wear. It can be seen that metal wear is an important issue related to the national economy. How to improve the anti-wear ability of metals and develop new anti-wear alloys has long been an important issue faced by scientific and technical workers. [0003] Among the many methods to solve the problem of wear and tear failure, surfacing welding technology shows unique advantages. It can make full use of existing resources and realize the transformation of "scrap parts → renewable resources → products". Restored remanufactured products are cheaper and better than new products. [0004] The commonly used surfacing materials include iron-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/32B23K9/26
CPCB23K9/04B23K9/164B23K9/26B23K35/0255B23K35/3053
Inventor 庄明辉李慕勤杨文杰李克山仇思鹏毕研军
Owner JIAMUSI UNIVERSITY
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