Laser cladding method

Abstract

The invention provides a laser cladding method which comprises the steps of: blanking, preparing cladding material according to a workpiece to be cladded; and laser cladding, melting parent material by laser, fusing the cladding material and the melted parent material onto the parent material and forming a cladding layer. According to the laser cladding method, the cladding layer is bonded with the parent material in a metallurgical bonding way; and the cladding speed is rapid, the heat affected zone is small, and the quality of the cladding layer is more easily controlled, so that quality defect such as a brittle point or a crack is not easily caused, and the bonding force between the cladding layer and the parent material is strong.

Description

technical field [0001] The present invention relates to the field of engineering machinery, and more specifically, to a laser cladding method. Background technique [0002] In the field of construction machinery, there are many parts with special requirements, which need special treatment. [0003] Taking the existing pumping system as an example, its vulnerable parts can be roughly divided into: concrete cylinder, concrete delivery pipe, S pipe, spectacle plate, and cutting ring. [0004] The current production method of the concrete cylinder is: the inner surface after machining is plated with a certain thickness of hard chromium by electroplating to enhance the wear resistance and corrosion resistance of the inner wall of the concrete cylinder. The production method of the conveying pipe is: the inner wall of the single-layer / double-layer conveying pipe is strengthened by heat treatment to improve the wear resistance of the inner wall of the concrete conveying pipe. The ...

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Problems solved by technology

[0005] Among the above production methods, hard chromium electroplating is costly, seriously pollutes the environment, and has low production efficiency. Moreover, the combination of the hard chrome-plated concrete cylinder electroplating layer and the parent body is a non-metallurgical combination. Once the electroplating layer is partially damaged, the entire inner wall of the concrete cylinder The electroplating layer will fall off in pieces, causing the concrete cylinder to be scrapped

The hardness of the inner wall of the delivery pipe is unsatisfactory after heat treatment, and the inner hole is often non-circular due to the manufacturing error of the steel pipe. scrapped

Due to the high pressure impact, the spectacle plate and the cutting ring have to rub against the concrete, and the working conditions are very bad. Although the existing technology uses cemented carbide to prolong its service life, the effect is still not good, and the spectacle plate and the cutting ring are worn. After that, it is completely scrapped, and the waste is serious

However, the surfacing welding process of S pipes is inefficient, and the quality of surfacing welding with wear-resistant electrodes is difficult to control

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