Laser Cladding Process: Technical Analysis, Equipment Innovation, and Industrial Application Guide

As a core supporting technology in the field of green remanufacturing, laser cladding technology plays a crucial role in industrial sectors such as aerospace, petrochemicals, and machinery manufacturing with its efficient and precise coating preparation capabilities. It not only enables the repair and regeneration of damaged parts but also enhances the wear resistance, corrosion resistance, and other properties of workpiece surfaces, aligning with the national sustainable development strategy. This article will analyze the core process differences, equipment technological innovations, key material advancements, and industrial application status of laser cladding, while sorting out the technical development trends and industrial upgrading directions, providing comprehensive technical references and application guidelines for relevant enterprises and practitioners.

Two Major Laser Cladding Process Systems: The Technical Divide Between Two-Step Method and One-Step Method

Laser cladding processes are mainly divided into the two-step method (preplacement method) and the one-step method (synchronous method), which differ significantly in technical routes, efficiency, and applicable scenarios. The two-step method requires preplacing the cladding material on the workpiece surface first, followed by laser melting and forming. It specifically includes two approaches: manual precoating and preformed sheets. Manual precoating has low costs and flexible operation, but its production efficiency is only about 0.5㎡/h, and the coating thickness tolerance reaches ±0.2mm, making it more suitable for single-piece repair or laboratory research. Preformed sheets are made by molding powder with a small amount of binder, achieving a powder utilization rate of over 90% and stable coating quality, which is suitable for the repair of deep-hole precision parts such as small-diameter valve bodies. The one-step method realizes synchronous laser irradiation and material delivery. Among them, the synchronous powder feeding method uses an injection device to feed powder into the molten pool in real-time, with a thermal efficiency of over 85% and the ability to achieve automated production. Its market share had reached 78% by 2025, becoming the mainstream choice for batch strengthening of shaft and disc parts. Although the synchronous wire feeding method has no material waste and good component uniformity, its laser utilization rate is less than 60%, and the wire specifications are limited. Currently, it is more used in the repair of specific scenarios such as pipeline inner walls and hydraulic props.

Laser Cladding Equipment Innovation: Breakthroughs from Precision Powder Feeding to High-Power Adaptation

As a core component of laser cladding, the performance of powder feeding equipment directly determines the coating quality. In recent years, the industry has achieved major breakthroughs in precision and power adaptability. Taking the precision powder feeding equipment of Xi'an Guosheng Laser as an example, this equipment is adapted to a 10KW laser power, and the powder feeding accuracy can still reach ±0.1g/min under high-power working conditions, with the minimum micro-powder feeding rate as low as 0.5g/min. At the same time, it adopts an all-HT cast bed design with excellent shock absorption performance. Equipped with a full-water-cooled cladding head, it can realize 24-hour continuous operation, with a maximum load capacity of 3T, which can meet the cladding needs of the outer circle and inner hole of shaft and disc workpieces with specifications of Φ600mm×3000mm. In the field of synchronous wire feeding equipment, the 10KW/15KW industrial equipment launched by Zhongke Zhongmei in 2025 has increased the wire melting efficiency to 10kg/h, far exceeding the 1-2kg/h level of international similar equipment. It is also adapted to full-specification wires of 1.2-3.2mm, breaking the limitation that traditional equipment can only handle wires less than 1.2mm, and greatly expanding the industrial application scope of the wire feeding process. Compared with traditional equipment, the new-generation equipment has significantly optimized key indicators such as powder clogging rate (reduced from 15%-20% to less than 3%) and cladding head service life (extended from 3-6 months to 12-18 months), laying a foundation for the large-scale application of laser cladding.

Key Materials for Laser Cladding: Performance Upgrading of Alloy Powders and Industrial Bottlenecks

The performance of cladding materials directly affects the coating quality. In recent years, significant progress has been made in the research and development of special alloy powders, among which high-speed cladding special powders have performed particularly prominently. Taking the Fe55 alloy powder of Jingye Additive as an example, this powder has a sphericity of over 95% and a porosity of less than 5%, which is adapted to the high-speed cladding process of 10-15m/min. The coating hardness reaches 55HRC, and its wear resistance is 5 times higher than that of conventional powders. No rust occurs after 500 hours of salt spray corrosion testing. It has been widely used in the repair of coal mine hydraulic props and oil drill pipes, extending the service life of workpieces by 3-5 times. However, the industry still faces two major bottlenecks in the material field: first, the localization rate of special alloy powders is low, with the localization rate of high-temperature alloys (such as Inconel 718) powders only 35%, relying heavily on imports; second, cost constraints are obvious. The price of cobalt-based powders is as high as 800 yuan/kg, which is 6 times that of iron-based powders, significantly increasing the application cost in high-demand scenarios. It is urgent to achieve breakthroughs through material formula optimization and production process improvement.

Current Status of the Laser Cladding Industry: Application Potential and Shortcomings Driven by Policies

Driven by both policies and the market, the scale of the laser cladding industry has grown rapidly, while also exposing shortcomings in application. On the policy side, "Made in China 2025" lists laser cladding as a key development direction for high-end equipment, with R&D subsidies of up to 30 million yuan in 2025. Regions such as Jiangsu and Hubei have also built laser cladding industrial bases, providing land preferential policies and tax reductions. On the market side, the global laser cladding market size exceeded 800 million US dollars in 2025, with the Asia-Pacific region accounting for 45.42%, of which China contributed 70% of the growth. Aerospace precision repair (accounting for 60% of North American demand) and new energy equipment strengthening (with a growth rate of 22% in China) have become core growth areas. However, there are still obvious shortcomings in industry applications: on the technical side, the service life of cladding heads for 10,000-watt-level equipment is generally less than 3 months, with insufficient durability, and the detection rate of internal cracks is only 65%, lacking a standardized non-destructive testing plan; on the industrial side, only 30% of enterprises have passed the ISO 3834 welding quality certification, with a gap in the quality system. At the same time, the investment in a single piece of equipment is about 2 million yuan, and the penetration rate among small and medium-sized enterprises is only 12%. High application costs restrict market popularization.

Laser Cladding Head

Fiber Laser Machine

Powder Feeder

Robot Arm

Development Trends and Industrial Summary of Laser Cladding Technology

In summary, laser cladding technology has moved from theoretical research to the initial stage of large-scale application, and will evolve in three major directions in the future: in terms of equipment intelligence, equipping with AI vision systems to realize real-time monitoring of molten pool temperature can reduce the rejection rate by 40%; in terms of process hybridization, the integrated technology of laser cladding and 3D printing will realize one-stop processing of "repair-strengthening-forming" for damaged parts, improving production efficiency; in terms of material cost reduction, doping tungsten carbide (WC) in iron-based powders can reduce costs by 60% while achieving performance close to that of cobalt-based powders. To promote industrial upgrading, efforts should be made in three aspects: first, jointly establishing a research and development alliance of "power devices - powder feeding systems - testing equipment" with universities and enterprises to break through core technical bottlenecks; second, accelerating the formulation of the "Laser Cladding Coating Quality Classification Standard" to standardize key indicators such as hardness, bonding strength, and porosity; third, promoting the "equipment leasing + technical service" model to reduce the entry threshold for small and medium-sized enterprises. With the continuous maturity of technology and the improvement of the industrial ecosystem, laser cladding technology will play a greater role in the green transformation and high-end upgrading of the manufacturing industry.