Explore our top-tier engineering solutions, highly optimized for industrial durability, precision surfacing, and micro-plasma repair applications.
Shanghai Duomu has been a leading manufacturer and exporter of PTA cladding machine and Laser cladding machine for more than ten years with a strong technical background. Our continuous focus on innovation and surface modification engineering has allowed us to deliver state-of-the-art equipment to industrial operators globally. We specialize in configuring multi-axis automated robotic systems, high-density plasma arc machines, and intelligent EDM repair setups designed to withstand the most abrasive, corrosive, and high-temperature operating environments.
Stainless steel is highly valued across global industries for its corrosion resistance, aesthetic properties, and exceptional mechanical strength. However, joining and cladding stainless steel requires a deep understanding of its metallurgy. The key factor behind its corrosion resistance is chromium, which forms a passive chromium oxide (Cr₂O₃) layer on the surface. When executing various stainless steel welding methods, heat input must be carefully managed to prevent sensitization—a metallurgical phenomenon where chromium carbides precipitate along the grain boundaries at temperatures between 450°C and 850°C. This local depletion of chromium leaves the material highly susceptible to intergranular corrosion.
Depending on the microstructural phase, stainless steels are classified into four primary families:
Choosing the right joining or surface modification technique relies heavily on the specific mechanical requirements, dimensional tolerances, and alloy compositions of the project. Below, we compare the primary industrial techniques manufactured and supplied by Shanghai Duomu.
TIG welding remains the standard for high-purity, thin-section stainless steel welding. However, traditional TIG exhibits low penetration depth and slower deposition rates. To solve this, Shanghai Duomu supplies the **S-TIG (Super-TIG)** system. By utilizing specialized activating fluxes or optimized current frequencies, S-TIG increases the depth-to-width ratio of the weld bead by up to 300% without increasing heat input. This eliminates the need for complex V-groove preparations on plates up to 8mm thick, reducing consumables usage and labor costs.
PAW offers a highly concentrated, column-like arc, resulting in greater keyhole penetration and higher travel speeds than traditional TIG. In surface engineering, **PTA Cladding** has revolutionized wear-resistant overlays. By feeding metal powder (such as Stellite, Colmonoy, or Tungsten Carbide blends) directly into the plasma arc, PTA creates a dense, metallurgically bonded protective layer. A key benefit of our PTA systems is the ultra-low dilution rate (under 5% in a single pass), preserving the alloying properties of the clad material with minimal penetration into the base metal.
Laser cladding uses a high-power laser beam to melt a thin layer of the substrate and a simultaneously fed alloy powder. The high energy density allows for rapid melting and solidification. The heat-affected zone (HAZ) is extremely narrow, minimizing thermal distortion and residual stress. Laser cladding is the preferred method for high-value components like aerospace turbine blades and high-precision hydraulic shafts, where maintaining dimensional tolerance is critical.
For micro-defects, blowholes, and wear on injection molds or precision dies, traditional arc welding causes too much thermal distortion. Intelligent EDM repair systems use high-frequency electrical discharges to deposit electrode material onto the workpiece. The process generates virtually no heat, preventing annealing, distortion, or stress cracks.
I have an independent R&D team, which develops, produces and sells plasma cladding machine equipment. The welding machine has stable performance and can maintain efficient long-term operation. In addition, the laser cladding equipment sold by the company can effectively support large-scale remanufacturing projects. We have mature technological means to provide complete sets of industrial equipment solutions. Our lab focuses on reducing dilution rates, developing automated robotic trajectory algorithms, and custom alloy powder formulations to match unique wear and corrosion challenges.
We design, configure, and customize automated systems tailored to industry-specific components like hydraulic rods, picks, valves, and screw shafts.
As a premier China-based manufacturer, Shanghai Duomu leverages the robust industrial ecosystem of the Yangtze River Delta. This proximity allows us to secure high-quality structural steel, advanced electronic components, gas regulation valves, and high-purity tungsten materials at competitive rates. We pass these efficiency savings directly to our global customers.
Our manufacturing facility operates under a strict Quality Management System (QMS) matching ISO 9001 standards. Key factors driving our production resilience and efficiency include:
At present, the 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.
Our hardfacing systems deposit high-durability carbide overlays on plow blades, subsoilers, and harvester cutting mechanisms, extending their service life in abrasive soil conditions.
Precision micro plasma arc systems and laser cladding setups are used to repair high-performance titanium and stainless steel turbine blades, maintaining tight tolerances and structural integrity.
We supply corrosion-resistant cladding systems for drill collars, pump shafts, and mud motor components exposed to harsh downhole environments and corrosive drilling fluids.
Heavy duty automated plasma surfacing equipment is applied to rebuild and reinforce metallurgical rolls, continuous caster rollers, and forging dies under high-temperature fatigue.
The demand for advanced surface modifications and high-precision welding methods is growing globally. As heavy industries face rising raw material costs and supply chain constraints, extending the life of existing components through remanufacturing is more critical than ever.
Shanghai Duomu supports this shift by establishing an international network of technicians and local distributor hubs. We provide comprehensive service from initial consulting to deployment:
See how industrial operators apply our technologies to solve critical wear, corrosion, and dilution challenges.
"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, and marine demand more resilient materials, Duomu's PTA overlay systems offer reliable protection against premature failure."
"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. Implementing automatic plasma screw cladding has dramatically increased our uptime."
"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 seek corrosion resistance or impact wear protection, Duomu's control systems keep dilution below 5%."
"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. Automated overlay systems have transformed our bottom line."
"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. Custom PTA overlays are the only viable solution to maintain valve seal integrity."
Get authoritative answers to key technical questions about advanced stainless steel welding, PTA cladding, and EDM repair.
Complete your manufacturing configuration with our selection of specialized welding torches, robotic arm systems, and high-purity tungsten electrodes.
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