In modern heavy manufacturing, critical machinery components in mining, power generation, petrochemical processing, and metallurgy are constantly subjected to severe wear mechanisms—including high-stress abrasion, adhesive wear, severe corrosion, and high-temperature thermal fatigue. Standard substrate metals often fail prematurely under these harsh operating conditions, leading to unexpected plant downtime and skyrocketing maintenance costs.
As an established high-quality plasma arc welding machine manufacturer, Shanghai Duomu delivers state-of-the-art Plasma Transferred Arc (PTA) cladding and laser cladding machinery. These advanced surfacing systems deposit highly durable metallurgical alloys onto base metals, forming a protective barrier that extends the operational life of components by up to 500%. By optimizing heat input and powder delivery, our equipment minimizes the dilution rate while maximizing structural integrity.
Explore our specialized plasma torches, laser cladding gantries, and automated hardfacing systems engineered for extreme industrial performance.
Ultra-precise overlay cladding designed to resist marine rust and high friction on hydraulic piston rods.
Thermally stable, non-consumable electrodes optimized to provide stable pilot arc ignition for PTA processes.
Compact, high-density plasma arc torch ideal for narrow grooves and precise internal bore cladding.
Automated multi-axis control system for applying protective overlays to heavy flight screw conveyors.
Heavy-duty modular gantry system capable of processing large-scale sheets and flat steel surfaces.
Dual-column structural design providing ultimate stability for long-stroke cladding of industrial rollers.
Engineered specifically for aerospace gas turbine and power plant turbine blades repairing.
Compact, mobile cladding unit for rapid on-site repair and emergency industrial component servicing.
Shanghai Duomu has stood at the forefront of the surface engineering sector for over a decade. We have established ourselves as a reliable manufacturer and exporter of Plasma Transferred Arc (PTA) cladding systems and laser cladding machinery. Rooted in rigorous scientific R&D, our technologies are built to withstand the demands of heavy industrial production environments.
Our core mission is to provide global enterprises with robust, customizable, and highly efficient thermal surfacing solutions. By combining advanced plasma power supplies with modern CNC and robotic control platforms, we deliver machinery that optimizes metallurgy, reduces operational cost, and ensures consistent quality.
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Our dedicated in-house research and development department works continuously to innovate plasma cladding technologies. By refining powder delivery mechanics, optimizing electrode configurations, and developing advanced closed-loop control software, our systems achieve stable performance under continuous, long-term operational stresses.
In addition to our core PTA machinery, Shanghai Duomu's laser cladding line supports large-scale industrial remanufacturing. We combine mechanical engineering, materials science, and automation programming to build fully integrated, turn-key industrial setups customized to your process requirements.
Consult an EngineerPlasma Transferred Arc (PTA) welding is an advanced thermal surfacing process used to apply wear- and corrosion-resistant metallurgical layers over a wide range of substrate materials. The process utilizes a collimated, high-energy plasma arc to melt both the surface of the base metal and a filler material—typically metallic powder or wire fed into the arc.
Unlike conventional Gas Tungsten Arc Welding (GTAW/TIG) or Gas Metal Arc Welding (GMAW/MIG), the PTA arc is highly concentrated and stable, restricted by a cooled copper nozzle. This high energy density produces a narrow heat-affected zone (HAZ), reduces dilution rates (commonly between 3% and 10%), and allows for high deposition rates. As a result, critical surfaces can be clad with expensive alloys, such as cobalt-, nickel-, or iron-based powders, without compromising the alloy properties through excessive mixing with the substrate.
Modern surface engineering often requires choosing between PTA cladding and Laser Cladding. Both methods create excellent metallurgically bonded layers, but their thermal dynamics differ:
| Parameters | Plasma Transferred Arc (PTA) Cladding | Laser Cladding (Diode / Fiber) |
|---|---|---|
| Heat Source | Constrained electric plasma arc | High-density laser beam |
| Metallurgical Bond | Strong, fully fused metallurgical bond | Strong, fully fused metallurgical bond |
| Dilution Rate | 3% - 10% (optimized systems) | 1% - 5% (extremely low dilution) |
| Heat Input | Moderate to High | Low (minimal thermal distortion) |
| Deposition Rate | High (up to 6+ kg/hour) | Low to Moderate (1 - 3 kg/hour) |
| Capital Investment | Cost-effective setup and tooling | Higher capital equipment cost |
Our facility manufactures both equipment types, allowing us to recommend the ideal process based on your budget, production volumes, and thermal distortion tolerances.
A cladding system's performance is tied closely to the alloys it deposits. Shanghai Duomu PTA systems are optimized for a variety of metal powders:
Shanghai Duomu's customized automated cladding systems operate across multiple demanding global industries.
Applying tungsten carbide coatings to plowshares, harvester blades, and tillers to prolong equipment life in highly abrasive soils.
Precision refurbishment of gas turbine blade tips, structural components, and high-performance wear sleeves with low distortion.
PTA cladding of drill collars, stabilizer bands, and mud pump rotors to resist downhole corrosion and extreme friction.
Hardfacing continuous casting rollers and hot forging dies to withstand cyclical thermal shock and high load levels.
As industrial manufacturing adopts Industry 4.0 standards, thermal cladding systems are transitioning toward fully automated, closed-loop processing. Shanghai Duomu is actively developing and integrating new features to meet these demands:
Deploying heavy industrial hardware internationally requires strict adherence to global safety and manufacturing guidelines. Our design and fabrication departments ensure that all Shanghai Duomu machinery complies with international standards, including:
We support our international clients with remote diagnostic systems and global field engineers, helping to ensure rapid installation, commissioning, and operator training.
Technical clarifications on PTA and Laser Cladding operation, material selection, and hardware customization.
Advanced planar surfacing stations, heavy manipulator positioners, and specialized bore welding systems.
Specialized internal cladding solution for long pipes, valves, and cylindrical inner walls.
Multi-axis cladding system designed for sealing surfaces of ball valves used in high-pressure oil lines.
Square-wave AC/DC inverter system designed for high-purity aluminum joining and overlay processing.
Our flagship 400A heavy-duty PTA system, optimized for continuous multi-shift industrial deposition.
Designed for producing flat wear-resistant plates, liner boards, and square chute components.
Flexible cantilever mechanical configuration optimized for handling bulky workpieces.
Handheld operational configuration offering mobility for on-site mold and tool steel repairs.
Precision rotational and tilt work-holder, fully integrated with PLC for synchronized motion.
We design and build customized setups, automatic laser cladding lines, automatic plasma cladding units, and robotic systems tailored to your production goals.
Highly accurate vertical cladding station designed for mass production of critical valving seats.
A versatile dual-purpose unit supporting both traditional welding joint preparation and surfacing.
Upgraded system architecture for complex path profiles and multi-alloy overlays.
Equipped with high-precision optical scanning heads to repair compressor and turbine blades.
Specialized indexing rotary table for uniform coverage on hemispherical ball valve profiles.
Utilizes laser surface heating and rapid self-quenching to increase surface hardness.
Heavy-duty automated lathe bed configuration designed for consistent, high-yield cladding on long-stroke hydraulic pistons.
Technical updates, case studies, and application feedback from heavy industrial operations.
"The PTA Welding Valve Application Guide is not just a process choice for valve manufacturers facing high wear, high corrosion, and high-temperature erosion working conditions, but also a key path to improving product competitiveness. As industries such as petrochemical, gas, and power generation demand longer equipment life, transitioning to automated PTA cladding systems has significantly reduced our scrap rates."
"In industries such as mining, cement, power generation, steelmaking, chemical processing, and biomass energy, screw conveyors are often regarded as auxiliary equipment. However, maintenance data shows that they are among the most frequent causes of unplanned production shutdowns. Applying a hardfaced stellite overlay with the DLG-NC401 system increased our flight conveyor operational lifespan by four times."
"In Plasma Transferred Arc (PTA) hardfacing, achieving a high-quality overlay is not only about selecting the right alloy powder or optimizing welding parameters. One of the most critical factors that directly affects overlay performance is the dilution rate. Shanghai Duomu systems allow us to maintain a consistent dilution rate of under 5%, preserving the full wear-resistant properties of our carbide powders."
"In industries such as Oil & Gas, Mining, Power Generation, Cement, and Heavy Equipment Manufacturing, hardfacing is no longer just a repair process. It has become a critical technology directly related to equipment lifespan, downtime costs, maintenance frequency, and overall operating margins. Decoupling the heat source from powder delivery in Duomu PTA units gives us the control needed for complex geometries."
"In industries such as oil & gas, petrochemical, power generation, mining, and marine engineering, industrial valves are constantly exposed to severe operating conditions including high pressure, extreme temperatures, corrosive media, abrasive wear, and sand erosion. Using Shanghai Duomu's automated ball valve welding setups has allowed us to increase production throughput while maintaining a uniform, defect-free seal face."
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