What are the advantages of laser cladding over other cladding technologies?
Time：
2023-03-08
来源：
Following the development of mechanised industry, and other cladding skills (such as spraying tungsten carbide, tungsten carbide spraying plasma spraying or arc welding) compared to laser cladding is a unique process, the use of which there are fundamental differences. With laser cladding, a highly concentrated heat source has a significant impact on the product. Because of its low heat input, high curing rate and accurate process control, laser cladding has many advantages.
1、All metallurgical bonding
No peeling, chipping or cracking: laser cladding has a complete metallurgical bond with the substrate, which means it will not peel or crack like plasma or thermal spray coatings.
Little or no voids or porosity: Unlike plasma or thermal spray, laser cladding is suitable for thoroughly dense coatings.
2. Low heat input process
Significant reduction in thermal distortion: Laser cladding requires less than 20% heat input compared to cladding the same part in an arc. The reduction in thermal distortion of the part is obvious. In many cases, fewer subsequent operations, such as machining and straightening, are required to solve the thermal distortion problem. Because of the low heat and distortion, thin-walled parts that cannot be clad with an arc can be clad with a laser.
Small heat-affected zone: Because heat input is reduced, the heat-affected zone is greatly reduced, increasing the strength of the part.
Very low dilution: Low heat input also reduces the dilution of the cladding. Reduced mixing of base metal and cladding means a purer cladding with better metallurgical function and higher corrosion and wear resistance.
Release cladding: Because of the lower dilution rate, a thinner cladding (compared to arc welding) is able to exert the same wear or corrosion function. This can significantly reduce the cladding material cost.
High condensation rate: Because of the high condensation rate and low heat input, materials such as carbides can be added to greatly improve the wear resistance of the coating. Traditional arc welding process melts carbide particles.
The ability to coat traditionally ‘unweldable’ materials: low heat input and fast curing enable materials such as carbon steel or nickel-based superalloys to be coated. These materials are difficult or even impossible to weld using conventional welding techniques.
3, excellent process control
Better layer thickness control and surface finish: Laser cladding enables better control of layer thickness, thinner cladding and better surface finish. The ability to apply closer to net shape coatings reduces the amount of finishing required and reduces the amount of residual cladding material applied.
Unlimited cladding thickness: Multiple cladding layers can be applied to achieve any thickness.
High Repeatability and Process Stability: Automation of the process provides excellent parameter control, resulting in outstanding process stability and reliable, repeatable results.
4, Generalisation
High stacking rate: High stacking rates can be achieved, especially with the use of hot-wire technology, which can shorten the application time.
Greatly extend the use of parts life: compared with plasma or thermal spraying and arc welding, laser cladding layer has excellent corrosion and wear resistance, and then greatly extend the use of parts life.
5, material options
One of the many advantages of the laser cladding process is that it is compatible with a wide range of material options, in the form of wire or powder; the options for material properties are virtually endless.
Advantages of powders
Material selection: Powder offers virtually unlimited potential for changing alloy composition, allowing the use of carbides and wire forms not available with other materials.
Advantages of wires
Data Capture: Unlike powders, there is no wasted data when cladding with wire filler materials.
Lower cost of materials: Wire filler materials are far less expensive than the same materials in powder form.
Unaffected by gravity: Wire is unaffected by gravity and unaffected by powder, thus enabling unsuitable wrapping to be accomplished.
2-5 times higher build-up rate using hot wire: Preheating the wire before it enters the melt pool reduces the amount of laser energy required to melt the filler material, and then a higher build-up rate can be achieved using the same laser power.
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What are the advantages of laser cladding over other cladding technologies?
Following the development of mechanised industry, and other cladding skills (such as spraying tungsten carbide, tungsten carbide spraying plasma spraying or arc welding) compared to laser cladding is a unique process, the use of which there are fundamental differences. With laser cladding, a highly concentrated heat source has a significant impact on the product. Because of its low heat input, high cure rate and accurate process control, laser cladding has many advantages.
Laser Applications in Silicon Carbide Semiconductor Wafer Processing
Silicon carbide is a high-performance third-generation semiconductor material with good optical properties, chemical inertness and excellent physical properties, including wide bandgap, high breakdown voltage, high thermal conductivity and high-temperature resistance, often used as a new generation of high-frequency, high-power device substrate materials, widely used in high-end manufacturing areas
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