If much large-scale equipment on the ship is damaged, it will often cause major economic losses and hazards. For example, the rotor shaft of the key part of the generator, because of its high operating accuracy and high speed, once damaged, its output power will be affected. The entire unit would be weakened or even paralyzed. To be on the safe side, damaged parts are generally replaced directly, but since parts in the shipbuilding industry are usually relatively expensive and the order cycle is long, they cannot meet the needs of ship repairs. Therefore, the ship repairing industry is facing an urgent problem: to develop a cheap, fast and highly reliable new ship repairing technology.
Commonly used traditional repair techniques mainly include ordinary electrode surfacing, spraying and electroplating. For less important parts, these traditional technologies can solve the problem, but for important parts, these traditional technologies all have defects in varying degrees. For example, surfacing welding and electric welding are easy to deform too much, and can only be used in less important parts; while spraying and electroplating methods have no deformation, but their repairable thickness is limited, and the bonding force between the repair layer and the base material is not strong. It cannot be used in high-speed, impact and heavy-duty occasions.
Laser cladding is the use of high-energy laser beams to irradiate the metal surface, and after rapid melting, expansion, solidification, and cooling, a layer of material with special physical, chemical or mechanical properties is clad on the surface of the substrate, thereby forming a metal body to make up for the lack of high performance of the fuselage. , this composite material can give full play to the advantages of both and make up for each other's shortcomings. According to the requirements of the working conditions of the workpiece, it can be welded with heat-resistant, wear-resistant, corrosion-resistant, anti-oxidation, anti-fatigue or surface coatings with optical, electrical and magnetic properties.
Advantages of laser cladding:
1. The metallurgical welding between the cladding layer and the substrate is tightly bonded, the bonding strength is high, and it is not easy to fall off;
2. When changing or restoring the geometry of the workpiece, surface strengthening while maintaining dimensions;
3. The use of functional materials can realize the customization of the surface properties of the workpiece and change the surface properties of the parts, such as wear resistance, high-temperature resistance, corrosion resistance, etc.;
4. The heat-affected zone and thermal deformation of the repaired part are small, and the workpiece matrix does not change
5. The repair process is automatically controlled by the machine to ensure the quality of the workpiece;
6. High repair efficiency and short construction period;
7. It can repair workpieces of various materials; the hardness of the cladding layer is in the range of HRC20~HRC60, which can be selected according to application requirements.
Because the repair layer produced by laser cladding repair technology is metallurgically bonded, its structure is dense, the bonding strength is high, and it is not easy to fall off. It has gradually become one of the best repair crafts for ships. Combined with the characteristics and advantages of laser cladding repair technology, the wear and tear of various steel, cast iron and stainless steel parts on ships can be repaired by laser cladding technology, and the overall performance after repair can reach or exceed that of new workpieces.
For the repair problems that have caused headaches for technicians in the ship repair industry in the past, laser cladding repair technology has shown its uniqueness, such as the repair of shafts, laser cladding repair technology can control the deformation within 0.01 ~ 0.02 mm, the larger shaft does not even deform; for the repair of cast iron and stainless steel workpieces, laser cladding repair technology can also solve the problem, and the effect is remarkable without cracks; the repair of workpieces with complex shapes can also be repaired accurately and efficiently. The most important thing is that the laser cladding repair technology uses a wide range of cladding materials, that is, materials similar to the matrix can be used to achieve the purpose of repairing the size, and materials with better performance can also be used. Excellent alloy materials can achieve surface modification. Purpose. These problems are often difficult to solve with traditional restoration techniques.
As a new technology, laser cladding repair technology, with its unique advantages, brings the possibility of repairing important parts to the ship repair industry. As mentioned above, the various characteristics of laser cladding repair technology determine that laser must have broad application prospects in the ship repair industry. With the wide application of laser cladding technology in the ship repair industry, it will bring considerable benefits to ship repair yards and ship owners. At the same time, the remanufacturing and repair of damaged workpieces is in line with the national industrial development due to the saving of material consumption and waste products. Therefore, the policy also has huge social benefits and is worthy of active promotion and application.
Xi'an Guosheng Laser Technology Co. Ltd. has powerful technology research and development ability, which is able to provide our customers with advanced laser equipment, fast delivery time and excellent after-sales service. Get more information on our website www.guoshenglaser.com or contact us via gs@gshenglaser.com.