Most of the workpiece surface modification processes in the mechanical industry are surfacing welding, thermal spraying, plasma spray welding, chrome plating and nitriding. With the changes in the industry, the requirements for traditional processes are getting higher and higher, and there are more or less unadjustable problems. As a new type of green remanufacturing surface modification technology, laser cladding technology is gradually replacing the traditional surface treatment process. The following is a comparison of various technologies:
Laser cladding VS thermal spraying
The coating prepared by laser cladding has dense microstructure and no porosity, and the coating and substrate are bonded by metallurgy, and the bonding strength is high.
The deposition rate of thermal spraying coating is high, but the powder utilization rate is only 50%. The coating has 1%~2% porosity, and the corrosive medium can cause corrosion to the substrate through these voids. The bonding strength of thermal spraying coating and substrate is generally less than 150 MPa, and the peeling phenomenon (mechanical bonding) of coating often occurs under heavy duty service conditions. In addition, thermal spraying is easy to produce noise and dust pollution in the work, affecting the environment and the health of personnel.
Laser cladding VS electroplating
Laser cladding process does not involve chemical processes, green and friendly to the environment, can choose a variety of hard coating, including iron, nickel and cobalt alloy coating, the coating prepared by this method has no defects, high bonding strength, durability is much higher than electroplating coating.
The electroplating process is one of the mainstream anti-corrosion and wear-resistant coating technologies, but the prepared hard chromium coating is generally accompanied by micro-cracks, poor adhesion between the coating and the matrix, and often cracks and peeling in the process of service, and high pollution and high power consumption, and is gradually banned.
Laser cladding VS Resurfacing welding
Laser cladding uses high power density and rapid cladding, and the heat input, heat affected zone and distortion are small, so as to ensure that the workpiece will not be deformed.
The surfacing technology can produce high-quality, defect-free metal coatings, such as argon tungsten arc welding and plasma spray welding, with metallurgical bonding interfaces. The bonding strength is high, and the thickness of single-layer deposition can reach 2mm ~ 3mm. The deposition efficiency of surfacing welding technology is very high compared to the deposition thickness of a thermal spray single layer of 25-50μm. However, high deposition efficiency is accompanied by high energy input, which induces the change of microstructure properties and thermal damage of the substrate material.
High-speed laser cladding VS Ordinary laser cladding
After high-speed laser cladding, the workpiece surface Ra~5-10um; After cladding, direct grinding and polishing of 0.15-0.20mm, the surface can reach a mirror effect. High processing efficiency, Guosheng Laser 6000W high-speed laser cladding machine processing 0.8mm thickness coating, processing efficiency can reach 0.8m²/h.
Ordinary laser cladding surface fluctuation is large: 0.4-0.5mm, follow-up processing: turning + grinding + polishing.
Guosheng Laser is committed to the innovation and research and development of laser surface treatment of metal materials. Now high-speed laser cladding technology and supporting equipment have been applied to petroleum machinery, construction machinery, coal, steel and automobile industries. Through effective market verification, Guosheng laser high-speed cladding efficiency is 3~4 times that of conventional cladding enterprises, with fast delivery speed and high cladding quality, which is widely recognized by customers. Can provide hardware and software integration technology solutions according to customers' specific conditions.