Tech Introduction:
In shipbuilding, petroleum, mining, and other manufacturing industries, a large number of pipelines need to be used. The inner wall of these pipelines will be worn to varying degrees during use, which will affect their service performance and service life. Therefore, increasing the wear resistance and corrosion resistance of the inner wall of the pipeline is the key to solve this problem.
As a new technology of material surface modification, laser cladding technology refers to placing selected coating materials on the surface of the coated substrate in different filler ways, melting them at the same time with the substrate surface layer by laser irradiation, and forming a surface coating of dilution layer substrate and metallurgical combination with the substrate material after rapid solidification, to significantly improve the wear resistance, corrosion resistance, and Heat resistance, oxidation resistance, etc. Its main characteristics are as follows: (1) ultrafast melting speed (103 ~ 106 ℃ / s), so its processing efficiency is very high and the processing speed is very fast（ 2) Good metallurgical bonding is formed between the cladding layer and the substrate, the microstructure of the cladding layer is dense, the heat-affected zone is small and the dilution rate is low（ 3) The selection of cladding materials is diverse, and different alloy proportions can be designed according to different engineering requirements, to effectively control the microstructure and properties of cladding layer in the cladding process（ 4) Laser cladding is a fine machining method, which can be used to realize the local machining of small areas, and there is no direct contact with parts in the machining process, which will not cause contact damage to parts, so it is convenient to realize the automatic control of the machining process. This technology has been preliminarily used in pipeline cladding.
At present, laser cladding technology can only clad large-diameter pipes, while for small and medium-sized pipes, it is mainly due to the limitation of cladding space, the laser head is difficult to enter the pipe, the implementation process is complex and expensive, and the conventional laser cladding processing head starts to focus at a relatively distant position, the processing efficiency is low, and it is easy to damage the protective mirror, It is difficult to achieve good processing quality.
The application demand for surface cladding and repair on the inner wall of some high load-bearing parts continues to increase, hoping to have excellent wear resistance, erosion resistance, and corrosion resistance, such as bearings, molds, cylinders, oil cylinders, extrusion cylinders, valves, etc. With the improvement of product service performance and structural complexity, the industry has put forward higher and higher application requirements for the applicable limit scale, versatility, and high quality and efficiency of inner wall laser cladding and repair technology.
Different from the outer wall laser cladding, the laser beam, powder, and cooling water in the inner wall laser cladding processing head need to be transmitted to the top of the optical head through a long distance in a limited space. To adapt to the processing of smaller and longer inner diameter parts, the inner wall laser cladding processing head is required to have the characteristics of high integration, high precision, and high rigidity.
Tech Applications：
