The process of laser cladding begins with a precisely controlled laser beam directed onto the substrate’s surface. This focused laser beam generates a localized, high-energy density heat source that melts the powdered alloy material. The alloy material is carefully selected based on the application requirements, ensuring optimal properties such as corrosion resistance, wear resistance, and thermal stability.
One of the key advantages of laser cladding lies in its ability to minimize heat transfer to the substrate. By focusing the laser energy, only a small area undergoes thermal exposure, preventing substantial changes in the substrate’s physical properties. This precision ensures that the original shape and dimensions of the substrate are preserved, crucial for maintaining component integrity and functionality.
Metallurgical bonding between the melted alloy and substrate occurs instantly as the molten material solidifies. This bond is characterized by its pore-free and crack-free nature, which significantly enhances the coating’s reliability and durability. The resultant surface exhibits superior properties compared to traditional coatings like nickel-chrome plating (NiCr) and high-velocity oxygen fuel (HVOF) spraying, making laser cladding an indispensable choice for critical applications.
Laser cladding provides significant technical, economic, and environmental benefits for industrial applications. For a deeper understanding of the advantages and disadvantages of laser cladding, visit our dedicated page Advantages and Disadvantages of Laser Cladding.
Our specialized equipment adeptly handles components of various sizes and complexities. From small, delicate parts to large components with diameters up to 2200 mm and lengths up to 24000 mm, our capability ensures precision and efficiency for every project. This is particularly crucial for applications where extreme accuracy is demanded under challenging conditions.
We have developed proprietary laser clad layers, such as those superior to widely used materials like Inconel 625, distinguishing our offerings with enhanced corrosion resistance, ductility, and wear resistance. With over 16 years of experience, our technological expertise not only extends equipment lifespan and boosts performance but also significantly reduces operational costs for our clients.
Recognizing the uniqueness of each project, Topclad provides custom solutions specifically designed to improve wear resistance, corrosion resistance, and thermal stability. Our laser cladding technology consistently delivers superior results compared to traditional methods like nickel-chrome plating (NiCr) and HVOF spraying. We also excel in applying both thick and exceptionally thin layers, adept at both new component treatment and repair/restoration work, ensuring that even the most critical applications receive the most effective surface treatment available.
A standard laser clad layer applied by Topclad is approximately 0.225 µm thick after machining. Layer thicknesses of up to around 1 mm are common. Thicker layers are mainly used for specialised repairs. In these cases, we can build up an unlimited number of clad layers without compromising coating quality. This allows us to rebuild even extensive damage with high precision and restore the component to its required final dimensions.
We mainly work with our proprietary powder alloys, which are tailored to specific applications and operating conditions. These laser clad layers have been extensively tested in collaboration with customers, suppliers and research institutes. We also apply standard alloys such as Inconel 625, Stellite 6, Stellite 21 and tungsten carbide alloys. The right choice depends on the operating conditions, such as corrosion, wear, high temperatures or a combination of these. We always advise which alloy is best suited to the specific application of the component.
Laser cladding and HVOF (High Velocity Oxygen Fuel) are both surface treatments, but they work differently. HVOF sprays particles onto the surface at high velocity, creating a mechanical bond. Laser cladding uses a laser to melt the powder together with the base material, creating a metallurgical bond. Laser clad layers are therefore generally denser, have stronger adhesion and are less prone to peeling under heavy loads or high temperatures. Read more about this on the ‘Laser Cladding Advantages’ page.
A laser clad layer is deliberately ductile, not brittle. A ductile layer is not made as hard as possible, but yields in a controlled manner under load. As a result, the layer is less likely to crack or peel under impact, pressure or bending loads. A layer that is too hard and brittle would be more likely to develop cracks under the same conditions. It is precisely this ductility that makes laser clad layers suitable for demanding applications such as offshore cylinders, dredging shafts and rollers.
Topclad does not apply laser cladding to cast iron components. Cast iron reacts unfavourably to the melting process and is prone to cracking. We also do not treat internal diameters, such as the inside of bushings or tubes; our setup can only reach external surfaces. Small consumer components fall outside our scope. Hard chrome plating or another coating is generally more economical for these parts. We specialise in heavy components with externally accessible surfaces for industry, offshore and infrastructure applications.
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