Custom TIG & PTA Cladding Process Solutions

Providing advanced surface hardening, PTA powder surfacing systems, and industrial laser cladding processes designed to resist high wear, extreme temperatures, and severe corrosion.

Custom Precision Surfacing Systems

Explore our engineering portfolio featuring high-reliability PTA torches, automated gantry systems, and micro plasma welders.

Technical Roadmap: Evolution of Custom TIG & PTA Cladding

How Shanghai Duomu builds upon traditional Tungsten Inert Gas (TIG) processes to pioneer High-Energy PTA & Laser Cladding systems.

Traditional TIG Processes

Traditional manual/automated TIG (GTAW) delivers highly precise welds, but suffers from low deposition rates (<1.5 kg/h) and is highly sensitive to electrode tip degradation. Standard processes struggle to achieve heavy hardfacing depths without high dilution rates that alter the base chemistry.

PTA Cladding Evolution

Plasma Transferred Arc (PTA) systems constrict the TIG arc using a copper nozzle, raising temperatures to 15,000°C+. Powder feeding reduces dilution to <5% in a single pass while increasing deposition rates up to 10 kg/h, making it optimal for heavy components in mining and petrochemicals.

Precision Laser Cladding

Utilizing high-power diode or fiber lasers to deposit alloy powders with minimal heat-affected zones (HAZ). Ideal for thin-walled parts, aerospace turbine blades, and high-tolerance hydraulic rod remanufacturing where thermal distortion must be near zero.

Technical Insight: TIG, PTA, and Laser Cladding share a core metallurgical foundation: localized melt pool management. While traditional TIG uses solid filler wires, advanced PTA and Laser Cladding leverage spherical gas-atomized powders (e.g., Stellites, Colmonoys, Tungsten Carbides) to configure surface layers with exact hardness (up to 65 HRC) and corrosion resistance properties.

Global Industrial Applications & Macro Performance Scenarios

Industrial components in heavy machinery face extreme mechanical loads, friction, and chemical degradation. Replacing entire assemblies is uneconomical. Automated surfacing and cladding processes present a highly sustainable way to extend part lifespans by up to 300%.

Shanghai Duomu's equipment and custom engineering solutions cover key macro sectors:

Petrochemical & Valves: Hardfacing ball valves, gate valves, and valve seats with cobalt-based alloys (Stellite) using custom ball valve automated welding lines to prevent fluid erosion.
Aerospace & Military: Thin-wall repairing of turbine blades, aero-engine housings, and high-stress landing gear assemblies with precise, low-heat micro plasma welders.
Mining & Heavy Machinery: Overlaying screw conveyors, picks, and dragline parts with Tungsten Carbide (WC-Co) matrices to combat severe abrasive wear.
Metallurgy & Forging: Reinforcing hot forging dies and extrusion rolls to resist thermal fatigue and mechanical impact.

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Shanghai Duomu Cladding Machine Engineering Worksite

Specialized Fields of Implementation

At present, our company's products have penetrated into many fields such as aerospace military industry, nuclear power, petrochemical industry, coal mines, metallurgy and forging, agriculture, water conservancy and electric power, etc.

Agricultural Machinery

Aerospace Military Industry

Petroleum Machinery

Metallurgy Casting

10+

Years R&D Experience

500+

Systems Installed Globally

<5%

PTA Dilution Rate

65 HRC

Max Overlay Hardness

Expertise, Process Optimization & Dilution Management

Understanding the thermodynamics of micro-plasma, PTAW, and Laser cladding to optimize deposit properties.

Why Dilution Control Matters in Cladding

In surface hardfacing (whether using TIG overlays, PTA, or laser systems), the dilution rate defines the percentage of base metal that melts and mixes into the deposited cladding alloy. If dilution is too high (e.g., >15%), the premium properties of the alloy powder (such as cobalt, nickel, or chromium) are degraded by iron migrators from the base carbon steel, requiring multi-layer deposits to achieve the target hardness or chemical resistance.

Shanghai Duomu's PTA powder cladding systems (such as the DML-V03CD and the DJC-LC305) employ a specialized dual-gas system. A central plasma gas generates the pilot arc, while a secondary shielding/powder gas feeds the alloy powder particles directly into the constricted transferred arc. This results in rapid powder melting before the particles touch the base metal, keeping the base metal heat input exceptionally low and achieving a dilution rate of 3% to 8% in a single pass.

Shanghai Duomu Technical R&D Lab & Design

Technical Department & Independent R&D Team

Our dedicated technical department features an independent R&D team that develops, produces, and sells plasma cladding machine equipment. The welding machines we manufacture exhibit highly stable arc performance, allowing for efficient long-term operations.

Additionally, our laser cladding equipment supports large-scale industrial remanufacturing projects. We offer mature metallurgical and system-integration technologies to deliver fully customized turn-key cladding lines to customers worldwide.

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The Importance of Electrode Calibration in TIG & Plasma Arcs

A stable arc requires precise electrode geometry. In precision TIG and micro-plasma processes, even minor deviations in the tungsten electrode tip's angle or concentricity will cause arc wander, uneven weld bead profiles, and potential tungsten inclusion defects.

Using a high-precision tungsten calibrator is critical. Precise grinding and calibration ensure that the electrode maintains a consistent point profile, which stabilizes the arc pressure and heat input. This level of repeatability is essential for automatic robotic setups (like the DH1440-B06 automatic plasma surfacing robot) to achieve flawless, repeatable weld overlays.

Field Reports & Engineering Testimonials

Read about industrial application insights and feedback from engineering teams on our wear-facing, valve cladding, and conveyor repair solutions.

"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 and power generation expand, Duomu's PTA cladding units provide reliable, low-dilution cobalt overlays."

Petrochemical Valve Engineer Shanghai, China

"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 downtime. Our overlay systems apply hard carbide layers to screw flights, increasing uptime significantly."

Maintenance Director Heavy Industry Plant

"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's torches control this variable with high precision."

Metallurgist Advisor Materials Research Institute

"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 productivity."

Hardfacing technology application review

Operations Lead Global Machinery Group

"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. Duomu's custom ball valve automated welding machinery has resolved these issues by depositing wear-resistant Stellite powder seamlessly."

Lead Process Specialist Valves Manufacturing Co.

Custom TIG & PTA Cladding FAQ

We address the critical engineering questions that process designers, procurement officers, and welding engineers ask about hardfacing systems.

Q1: What is the primary difference between traditional TIG and Plasma Transferred Arc (PTA) cladding? +

Traditional TIG (GTAW) uses a non-consumable tungsten electrode under an inert shielding gas shield, with filler wire added manually or via wire feeder. The arc is relatively wide and unconstrained. PTA cladding constricts the arc through a specialized water-cooled copper nozzle, creating a highly focused column of plasma at significantly higher energy densities. PTA uses metal powders rather than wire, allowing the feeding of custom alloy mixtures (like tungsten carbide blends or cobalt-based alloys) directly into the arc, achieving lower dilution rates (<5%) and higher deposition rates (up to 10 kg/h) compared to traditional TIG overlays.

Q2: How does Shanghai Duomu design custom setups for hydraulic rod and ball valve cladding? +

We develop dedicated systems tailored to specific component geometries. For instance, the DQF-LC602 Ball Valve Automated Welding Equipment features multi-axis rotational positioners synchronized with a precision PTA or Laser torch to cladding valve spheres uniformly. For hydraulic rods, we offer systems like the DYY-LC501 Hydraulic Rod Automatic Plasma Cladding System, which incorporates linear travel rails and rotating chucks with integrated pre-heating control to prevent cracking during deposition on high-strength steel shafts.

Q3: Why is high-precision tungsten calibration necessary for micro-plasma and high-performance TIG/PTA welding? +

The stability and focus of the welding arc are heavily dependent on the geometry of the tungsten electrode. Any eccentricity or surface roughness on the tip can cause arc instability, weld wandering, and uneven heat distribution. In micro plasma arc welding or high-current automated PTA applications, a Tungsten Calibrator ensures precise grind angles, tip diameters, and concentric alignment, allowing for long-run automated processes without weld deviations.

Q4: What alloy powders can be used with PTA and laser cladding systems? +

Our systems support a wide range of gas-atomized metal powders, including Cobalt-based alloys (Stellite 6, Stellite 12), Nickel-based alloys (Colmonoy series), Iron-based alloys (for wear-resistant builds), and composite powders containing Tungsten Carbide (WC-Co/Ni) matrices. These materials are chosen based on the target application's wear mechanism, such as abrasive wear, adhesive wear, cavitation, or high-temperature oxidation.

Q5: Can laser cladding replace PTA cladding entirely? +

No, the two technologies are complementary. Laser cladding offers a smaller heat-affected zone (HAZ), lower dilution (often <2%), and superior precision, making it perfect for expensive, thin-walled components like aerospace blades or precise shafts. However, PTA cladding has much higher deposition rates, lower capital investment, and is better suited for heavy-duty, thick-layer overlays (e.g., coal mining picks, cement grinding rolls, large industrial valves) where higher deposition efficiency is preferred.