WS-400: 400A IGBT Inverter TIG Welder (GTAW) — Professional AC/DC Precision Welding Machine
WS-400
400A Professional TIG Welding Machine
Part of the TIG Welders product line. Designed and manufactured in Qingdao, China with IGBT inverter technology for reliable industrial performance. CE certified for global export.
Typical Applications: Shipbuilding & Marine, Heavy Pressure Vessels, Power Plant Construction, Heavy Structural Steel, Exotic Alloy Welding, Heavy Equipment Repair
Product Overview
The WS-400 is the flagship 400A AC/DC TIG welder (GTAW) in the WS series, purpose-built for heavy industrial applications requiring maximum power and continuous duty capability. Driven by advanced IGBT inverter technology with full digital waveform control, it delivers 400A of precision welding current with a 60% duty cycle at maximum output and 100% duty cycle at 310A. The WS-400 features the widest pulse frequency range in the series (0.5-2500 Hz), integrated water cooling system, and 30-channel memory storage for complex multi-material fabrication environments.
This professional-grade TIG welder handles aluminum plates up to 18mm, thick stainless steel sections, and exotic alloys with authority. The integrated water cooling circuit maintains optimal torch temperature during extended 400A operation, while the advanced AC balance and frequency controls provide unmatched arc characteristics for every aluminum grade. CE certified and built for three-phase 380V industrial power, the WS-400 is deployed in shipyards, power plant construction, heavy pressure vessel fabrication, and structural steel workshops where welding productivity and X-ray quality results are non-negotiable.
Detailed Specs — WS-400
| Parameter | Specification |
|---|---|
| Model | WS-400 |
| Welding Process | TIG (GTAW) / Stick (SMAW) |
| Rated Input Voltage | AC 380V ±15%, 3-Phase, 50/60Hz |
| Rated Input Power | 13.8 kVA |
| Output Current Range (TIG) | 10 – 400A |
| Output Current Range (Stick) | 10 – 380A |
| Rated Duty Cycle (TIG) | 60% @ 400A / 100% @ 310A (40°C) |
| Rated Duty Cycle (Stick) | 60% @ 380A / 100% @ 295A (40°C) |
| No-Load Voltage | 80V |
| AC/DC Mode | AC / DC (TIG), DC (Stick) |
| Pulse Frequency | 0.5 – 2500 Hz |
| Pulse Duty Ratio | 5 – 95% |
| Pre-Flow Time | 0 – 20s |
| Post-Flow Time | 0 – 60s |
| Up-Slope / Down-Slope | 0 – 20s each |
| Arc Start | High Frequency (HF) / Lift TIG |
| AC Balance (Cleaning Width) | 5 – 95% |
| AC Frequency | 40 – 400 Hz |
| AC Waveform | Square / Triangular / Sine / Soft Square |
| Spot Welding Mode | 0.1 – 20s adjustable |
| Tungsten Electrode Size | 1.6 – 6.4mm |
| Welding Thickness Range | 0.5 – 20mm (steel), 1.0 – 18mm (aluminum) |
| Water Cooling | Integrated (built-in water tank and pump) |
| Efficiency | ≥88% |
| Protection Class | IP23 |
| Insulation Class | H |
| Cooling | Water + Forced Air |
| Memory Presets | 30 channels |
| Dimensions (L×W×H) | 640 × 320 × 520 mm |
| Net Weight | 22 kg |
| Certifications | CE, RoHS (CSA available) |
| OEM Customization | Color, panel layout, input voltage, branding |
Application Scenarios
Shipbuilding & Marine
Heavy TIG welding of aluminum superstructures, stainless steel piping systems, seawater cooling lines, and cupronickel marine hardware on vessels of all classes.
Heavy Pressure Vessels
Root pass and multi-pass TIG welding on thick-wall ASME pressure vessels, reactors, and storage tanks requiring 100% radiographic inspection.
Power Plant Construction
Precision welding of boiler tubes, superheater assemblies, turbine casings, and high-temperature alloy piping in thermal and nuclear power stations.
Heavy Structural Steel
Critical joint TIG welding on high-rise buildings, bridge components, and industrial structures where full-penetration welds are specified.
Exotic Alloy Welding
TIG welding of Inconel, Hastelloy, duplex stainless steel, titanium, and zirconium for chemical processing equipment and aerospace applications.
Heavy Equipment Repair
On-site repair and reclamation welding of mining equipment, earthmoving machinery, crane booms, and heavy industrial gearboxes.
WS-400 vs Adjacent Models
| Model | WS-315 | WS-400 |
|---|---|---|
| Rated Current | 315A | 400A |
| Input Voltage | 220/380V 3-Phase | 380V 3-Phase |
| TIG Current Range | 10 – 315A | 10 – 400A |
| Duty Cycle @ Max | 60% @ 315A | 60% @ 400A |
| 100% Duty Cycle @ | 245A | 310A |
| Pulse Frequency | 0.5 – 2000 Hz | 0.5 – 2500 Hz |
| AC Frequency | 40 – 400 Hz | 40 – 400 Hz |
| AC Waveforms | Square | Square / Triangular / Sine / Soft Square |
| Max Aluminum Thickness | 12mm | 18mm |
| Net Weight | 16 kg | 22 kg |
| Memory Presets | 20 | 30 |
| Water Cooling | External (port ready) | Integrated (built-in) |
| Protection Class | IP21S | IP23 |
| Insulation Class | F | H |
| Best For | Industrial Al fab, aerospace, pressure vessels | Heavy industry, shipbuilding, thick aluminum, exotic alloys |
Technical Highlights
Integrated Water Cooling System
Built-in water tank, pump, and radiator with thermal management circuitry. Maintains optimal torch operating temperature during extended 400A welding sessions without external cooler modules or additional hoses.
Quad Waveform Selection
Four selectable AC waveforms: Square (maximum penetration), Triangular (fast freezing for thin materials), Sine (classic smooth arc), and Soft Square (balanced penetration/cleaning). Optimized for every aluminum alloy and joint configuration.
Heavy-Duty IP23 Protection
Enhanced protection rating for harsh industrial environments. Resistant to water spray and small object ingress, suitable for outdoor shipyard and construction site deployment where standard IP21 machines would fail.
Class H Insulation (180°C)
Premium Class H insulation materials throughout the main transformer and inductor, rated for 180°C continuous operation. Delivers 100% duty cycle at 310A without thermal degradation, unlike Class F (155°C) machines.
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