4results about How to "Low dilution rate" patented technology

The invention provides a collaborative optimization method for a magnetic-thermal composite field assisted laser cladding process. According to the method, a magnetic-thermal composite field-assisted laser cladding device is designed based on an energy field-assisted laser cladding process principle and is used for improving the structure and performance of a coating; the method comprises the following steps: generating a quadratic polynomial regression model on the basis of an RSM method, magnetic-thermal composite field assisted laser cladding process parameters and nickel-based composite coating quality evaluation indexes, performing multi-target optimization on the coating quality evaluation indexes on the basis of the quadratic polynomial regression model and an IMOGWO algorithm, determining a magnetic-thermal composite field assisted laser cladding target process parameter combination, and determining the quality of the nickel-based composite coating. And score calculation is carried out on the target process parameter combination based on an EWM-TOPSIS method to obtain a comprehensive evaluation sequence of the target process parameter combination, so that collaborative optimization of the magnetic-thermal composite field assisted laser cladding process is realized, and the performance optimization efficiency and quality of the nickel-based composite coating are improved.

This invention discloses a method for in-situ laser-arc composite cladding of boiler heating surfaces, relating to the field of laser beam processing technology. The method includes: removing the corrosion layer and oxide film from the area to be repaired using dry ice blasting and laser; maintaining water cooling on the back side of the area to be repaired; pausing after each cladding section to allow the interlayer temperature to drop to 200℃-250℃; sequentially cladding the underlayer, transition layer, and wear-resistant layer; after each cladding layer is completed, the surface is treated with laser shock peening; when an abnormal enhancement of the Fe I spectral line at 435.2 nm is observed, it is determined to be "excessive dilution"; when a high-frequency burst signal of 80kHz-120kHz appears in the acoustic emission signal, it is determined to be "microcrack formation". This invention enables rapid repair of large-area heating surfaces with high bonding strength, low heat input, and no cracks, under in-situ boiler conditions without disassembly, overall preheating, and with a cooling medium on the back side.

The utility model discloses an underwater grouting head and grouting device, underwater grouting head includes inner casing, outer casing and apron, the inner casing has a grouting chamber, and the grouting chamber is provided with grout inlet and grout outlet on it and communicates, the outer casing is covered on the lateral wall of inner casing, and the medium cavity is formed between the inner lateral wall and the lateral wall of inner casing, and the medium inlet and medium outlet that communicate with the medium cavity are arranged on it, and the medium outlet ring is arranged in the side of grout outlet, the apron is the horn -like structure, and has deformability. The utility model has the advantages of: this underwater grouting head is isolated from the water flow through air curtain or water curtain barrier and apron, reduces the slurry dilution rate, makes the slurry coagulation in low disturbance environment, improves the grouting body compactness and the bonding strength, promotes the construction quality, and the whole underwater grouting head has no electronic component, is suitable for deep water environment, and the manufacturing cost is low.

The present application relates to a kind of full amorphous no crack iron-based amorphous coating of ultra-high speed laser cladding and preparation method.To be cladded workpiece is preheated, and the workpiece to be cladded that is preheated is clamped with chuck, and is placed on rotating carrier;Adjust the powder feeding speed of cladding device, carrier gas flow, shielding gas flow;Adjust the distance between cladding head and the workpiece to be cladded, laser focal point, powder flow focal point, set the moving speed of cladding head;Rotating carrier drives the workpiece to be cladded to rotate, and from outside to inside, laser cladding is started, and the full amorphous no crack iron-based amorphous coating of ultra-high speed laser cladding is formed on the surface of the workpiece to be cladded.The present application controls the process parameters of ultra-high speed laser cladding, and selects the parameters suitable for processing amorphous coating, realizes the rapid cooling of coating and defect-free preparation while ensuring the complete amorphous of coating.The coating has high corrosion resistance and excellent mechanical properties.