Inverter TIG Arc Welder WS-400 | Multi-functional TIG & MMA Welding Machine

When industrial welding operations demand maximum power, sustained high-duty-cycle performance, and the ability to penetrate the thickest materials, the WS-400 inverter TIG/MMA welding machine delivers. This is not a machine designed for occasional use or light fabrication—it is a heavy-duty industrial tool built for continuous operation in the most demanding manufacturing environments. With 400 amps of output capacity and engineering focused on reliability under extreme conditions, the WS-400 is the choice of heavy fabricators, shipbuilders, and large-scale manufacturers who cannot compromise on welding performance.

Power for the Toughest Jobs

The WS-400 provides 400 amps of welding current, giving operators the power needed to weld thick materials in a single pass that would require multiple passes with lower-output machines. This capability is essential for heavy structural fabrication, where thick steel plates are the norm and productivity depends on rapid deposition rates. In TIG mode, the high output enables welding of substantial thicknesses with excellent penetration and bead control, while in MMA mode, it supports the large-diameter electrodes used for heavy-duty stick welding. The power reserve also ensures that the machine operates well within its capacity during normal welding, reducing stress on components and contributing to long service life.

Professional Full-Bridge Inverter Engineering

The WS-400 is built around a professional-grade full-bridge inverter circuit specifically engineered for high-power, continuous operation. This topology is inherently more robust than simpler inverter designs, distributing electrical loads symmetrically to reduce thermal stress on components and improve overall reliability. The advanced power conversion design also provides superior efficiency, meaning more of the input power is converted to useful welding energy and less is wasted as heat. In heavy manufacturing environments where energy costs are significant, this efficiency provides real economic benefits over the life of the machine.

Stability Under Extreme Conditions

Heavy industrial welding often takes place in challenging conditions—inconsistent grid power, high ambient temperatures, and dusty environments that can compromise less robust equipment. The WS-400 is engineered to maintain stable performance under these conditions, with enhanced power conditioning circuitry that compensates for voltage fluctuations and internal thermal management that prevents overheating during extended high-output operation. This stability ensures that weld quality remains consistent regardless of operating conditions, a critical requirement for applications such as pressure vessel fabrication and structural welding where weld integrity is paramount.

Advanced Safety Protection Systems

The WS-400 incorporates comprehensive overvoltage and overcurrent protection systems that monitor operating conditions continuously and shut down the machine if abnormal conditions are detected. In the heavy industrial environment, where power surges and current overloads can occur without warning, this protection is essential for preventing damage to the machine and ensuring operator safety. The intelligent monitoring system also provides early warning of potential issues, allowing maintenance interventions before minor problems escalate into major failures that cause costly downtime.

High-Frequency Arc Starting for Demanding TIG Applications

In TIG welding, arc starting quality is directly linked to weld quality, particularly when welding reactive metals or in applications where tungsten contamination is unacceptable. The WS-400 employs a powerful high-frequency arc starting system that provides instant, reliable ignition in all conditions, even with long torch cables commonly used in heavy fabrication. The high-frequency spark is strong enough to penetrate contaminant films on the workpiece surface, ensuring a clean start even on materials that have been exposed to the environment. For critical applications, this reliable starting capability reduces the risk of weld defects and improves overall quality consistency.

Optimized Output for Heavy-Duty Wire-Filling

The WS-400's output characteristic is specifically optimized for heavy-duty wire-filling TIG applications, where the ability to add significant amounts of filler metal efficiently is essential. The power delivery curve provides smooth, linear response during filler addition, ensuring that the wire melts evenly and flows properly into the weld pool. This optimization is particularly valuable when welding thick sections where multiple passes are required, as it helps maintain consistent bead profiles and reduces the need for grinding between passes. The resulting weld quality is professional-grade, with smooth, uniform beads that meet the most demanding inspection criteria.

All-Position Welding Capability for Complex Assemblies

Heavy fabrication often involves complex assemblies that require welding in all positions, and the WS-400 is designed to deliver stable performance regardless of torch orientation. The consistent arc characteristics and responsive current control allow operators to achieve quality welds in flat, vertical, horizontal, and overhead positions, eliminating the need to reposition workpieces or modify welding procedures for different positions. This capability is particularly valuable in structural fabrication, where assemblies may be too large or heavy to reposition for optimal welding orientation.

Broad Material Compatibility for Heavy Fabrication

The WS-400 handles the full range of materials used in heavy industrial fabrication. It excels on carbon and low-alloy steels, providing the deep penetration and strong welds required for structural applications. It also handles stainless steel effectively, producing clean, corrosion-resistant welds for process equipment and marine applications. Aluminum alloys, which require careful current control to avoid burn-through, are also within the machine's capability. This material versatility makes the WS-400 a practical choice for fabrication shops that work with diverse materials and processes.

Built for Continuous High-Duty-Cycle Operation

Heavy industrial welding operations require machines that can maintain full output for extended periods, and the WS-400 is designed for exactly this purpose. The cooling system is engineered to handle the thermal demands of continuous high-amperage welding, maintaining component temperatures within safe limits even during prolonged operation. The rugged construction and heavy-duty internal components are selected for durability under the most demanding conditions, ensuring that the machine will continue to perform reliably over many years of service.

A Strategic Investment for Heavy Industry

The WS-400 represents a significant capital investment, but for organizations that depend on welding as a core production process, it is an investment that pays dividends through increased productivity, improved weld quality, and reduced downtime. The combination of power, reliability, and professional features makes this machine a foundation of heavy fabrication capability that will serve the organization well for years to come.

In summary, the WS-400 is the definitive heavy-duty welding solution for industrial applications requiring maximum power, exceptional reliability, and consistent, high-quality results. Its engineering excellence and robust construction make it a trusted partner for the most demanding manufacturing environments.

Technical Parameters of WS-400 Inverter TIG Arc Welder

Rated Input Voltage:AC380V ±15%

Rated Input Capacity (TIG / MMA):24.5 kVA / 29.9 kVA

Rated Input Current (TIG / MMA):37.2 A / 45.5 A

No-load Voltage:60 V

Output Current Adjustment Range:20 – 400 A

Duty Cycle:60%

Enclosure Protection Rating:IP21S

Efficiency:78.6%

Insulation Class:F

Overall Dimension (L×W×H):510 × 240 × 410 mm

Weight:22 kg