OTC DAIHEN VR400THF DC TIG / MMA Inverter Welding System
The OTC DAIHEN VR400THF is a premium dual-purpose DC TIG (GTAW) and Manual Metal Arc (MMA/SMAW) inverter welding power source designed for high-precision manufacturing. Operating at up to 400 Amperes, it features advanced IGBT inverter control that maintains exceptional arc stability across an ultra-wide current range—from heavy root passes down to a delicate 4 Amperes for micro-TIG welding of thin stainless steel sheet, titanium assemblies, and medical instrumentation. Equipped with reliable high-frequency (HF) arc start and comprehensive initial/crater current control, the VR400THF eliminates electrode contamination and crater cracking in critical pipe and pressure vessel fabrication.
⚙️ Core Technical Specifications & Performance Data
| Specification Parameter | Unit | OEM Specification | |
|---|---|---|---|
| Power Source Model | – | VR-400THF | |
| Rated Input Voltage | V, Hz | 3-Phase, 380V ±10%, 50/60 Hz | |
| Rated Input Capacity | DC TIG (GTAW) | kVA | 13.7 (13.0 kW) |
| DC MMA (SMAW) | 18.0 (17.1 kW) | ||
| Output Current Range | DC TIG (GTAW) | A | 4 ～ 400 |
| DC MMA (SMAW) | 10 ～ 400 | ||
| Rated Duty Cycle | % | 60% | |
| Dimensions (W×D×H) | mm | 328 × 596 × 580 | |
| Net Weight | kg | 56.5 | |
🔧 Engineering & Operational Guide
- High-Frequency Arc Start: Maintain clean tungsten electrode tips and correct shielding gas pre-flow settings to ensure consistent, contactless high-frequency arc ignition without high-voltage electromagnetic interference.
- Crater Fill Parameters: For pipe root passes and pressure vessels, always engage the crater repeat mode (4T) and set slope-down times appropriately to prevent crater shrinkage cracks and pinholes at arc termination.
- Grounding & HF Shielding: Keep the work return lead short and securely clamped directly to the workpiece. Proper grounding protects CNC positioning tables and adjacent sensors from high-frequency ignition noise.
📞 Contact for Global B2B Pricing & Technical Support
Anhui Oujie Automation Technology Co., Ltd. is your authorized supplier for genuine OTC DAIHEN industrial welding power sources, automated wire feeders, and robotic welding cells. We guarantee 100% authentic equipment for your production lines.
⚡ Fast global shipping. Genuine guarantee. Professional automation support included.
