Explore our leading custom-engineered plasma torches, automated welding systems, and high-performance EDM cladding repair machines.
In modern industrial remanufacturing and surface engineering, the demands on component life cycle management have reached an unprecedented level. Heavy industries including oil and gas exploration, deep shaft mining, marine transport, aerospace propulsion, and steelmaking operate in conditions where abrasive wear, erosive cavitation, and high-temperature oxidation constantly threaten systemic integrity.
As a pioneer in surface treatment systems, Shanghai Duomu provides cutting-edge engineering solutions with high-precision Plasma Transferred Arc (PTA) coating torches, custom laser cladding machines, and intelligent EDM repair platforms. The thermal surfacing efficiency and longevity of these systems depend fundamentally on torch mechanics. Achieving a minimum dilution rate while maximizing deposition rates is the hallmark of professional-grade manufacturing systems.
"PTA hardfacing allows for a highly controlled metallurgical bond with minimal dilution (often under 5%), enabling premium carbide overlays to retain their extreme hardness without being compromised by the underlying substrate metallurgy."
Shanghai Duomu has been a leading manufacturer and exporter of PTA cladding machines and Laser cladding machines for more than ten years with a strong technical background. Our dedicated R&D engineering group focuses exclusively on the development, mechanical simulation, thermal analysis, and production of state-of-the-art plasma cladding machine systems.
Our technical department possesses an independent R&D team which develops, produces, and sells plasma cladding machine equipment. The welding machines we manufacture exhibit exceptionally stable performance parameters, allowing heavy-duty industrial operators to maintain highly efficient, long-term continuous operation.
Additionally, the high-density laser cladding equipment sold by Shanghai Duomu effectively supports large-scale industrial remanufacturing initiatives. Through mature technological workflows, custom gas-flow simulation, and robust hardware configurations, we deliver comprehensive, end-to-end industrial solutions tailored to the world's most demanding working environments.
At present, Shanghai Duomu's products have penetrated into many critical fields such as aerospace military industry, nuclear power, petrochemical industry, coal mines, metallurgy and forging, agriculture, water conservancy, and electric power.
Strategic manufacturing ecosystems, robust R&D pipelines, and cost-efficiency advantages that empower global heavy industrial companies.
Our factories possess deep CNC precision machining capabilities, enabling us to customize internal powder delivery channels, water cooling jackets, and electrode angles to fit proprietary automated lines.
By simulating multiphase fluid flow in-house, our design team optimizes shielding and carrier gas velocities. This results in minimal spatter and maximum powder deposition efficiency on the workpiece.
We source high-purity oxygen-free copper and high-temperature resistant tungsten alloys. Strict ISO-certified testing procedures ensure zero leakage under high-pressure water-cooling demands.
Plasma Transferred Arc (PTA) technology is a high-energy thermal surfacing process. Unlike conventional welding methods (such as MIG or TIG), PTA utilizes a constrained arc generated through a nozzle orifice to produce extremely high thermal energy densities. This concentrated arc melts both the surface of the base metal and the metal alloy powder introduced into the plasma stream. The result is a fully metallurgical weld overlay characterized by high hardness and low matrix dilution.
Custom torches manufactured by Shanghai Duomu, such as the 120A Deep Hole Welding Torch and the 160A PTA Torch, are engineered to balance the thermodynamic characteristics of the arc. Operating at high duty cycles requires efficient heat dissipation. If the internal cooling design of the torch is sub-optimal, the copper nozzle will degrade rapidly due to thermal erosion, leading to arc instability and shifting dilution zones.
In wear-protection engineering, the dilution rate (the percentage of base metal that mixes into the deposited hardfacing layer) determines the final chemical composition and wear resistance of the overlay. A high dilution rate dilutes the high-cost carbide particles (such as tungsten carbides or chromium carbides) with the cheaper, softer base metal.
Through integrated multifunctional systems (such as the DML-V03CD and DML-V03AD), Shanghai Duomu achieves precise control over the arc heat input. By refining current parameters and powder feed velocity, our systems maintain a dilution rate below 5% in a single pass. This ensures that the premium wear characteristics of cobalt-based, nickel-based, or tungsten carbide alloys are fully preserved on the working surface.
The manufacturing industry is shifting rapidly toward complete process automation. Manual cladding often introduces inconsistencies in weld width, overlay thickness, and heat distribution. To address this, Shanghai Duomu designs automatic plasma and laser cladding platforms, such as the DZF-LC401 Straight Seam Automatic Platform and custom 6-Axis Robot Arm Welding Machines.
Integrating a custom torch with a 6-axis robotic manipulator allows for consistent, multi-angle deposition on complex geometries like valve seats, extruder screws, and excavator teeth. Automated systems continually adjust the standoff distance and linear travel speed, eliminating defects like porosity, undercutting, and micro-cracking.
Real-world applications and analysis from metallurgical engineering experts using Shanghai Duomu systems.
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, power generation, and chemical process engineering scale up pressure demands, our custom-valved hardfaced surfaces using the FB-200P automatic plasma welder demonstrate extended lifespans, reducing overall downtime.
Petrochemical Components Industry
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 tungsten carbide overlays using the DML-V03CD plasma powder surfacing system has dramatically reduced abrasive wear rates on the conveyor flight edges, extending component life three-fold.
Bulk Material Handling & Mining Systems
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. Whether you are using a standard manual torch or a custom robotic station, fine-tuning the standoff, arc voltage, and powder carrier gas velocity prevents excessive base metal melting, ensuring maximum wear-resistance.
Surface Coating R&D Labs
Comprehensive answers regarding industrial PTA torches, laser cladding machines, and specialized hardfacing workflows.
Browse our specialized product catalog featuring heavy-duty cantilever systems, custom-designed torches, and automated weld positioners.
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