OTC DAIHEN VR400II IGBT Inverter DC MMA Welding System
The OTC DAIHEN VR400II is an industrial-grade IGBT inverter DC Manual Metal Arc (MMA/SMAW) welding power source engineered for structural steel fabrication, pipeline construction, and onsite mechanical erection. Rated at 400 Amperes, it utilizes advanced constant-current inverter control to deliver a smooth, spatter-free DC arc. Equipped with adjustable dynamic Arc Force (dig control) and automatic anti-stick protection, the VR400II effortlessly ignites and maintains stable arcs with all types of coated electrodes—including low-hydrogen basic (E7018), acid, and cellulosic rods—even when operating over long extension cables in harsh outdoor field conditions.
⚙️ Core Technical Specifications & Performance Data
| Specification Parameter | Unit | OEM Specification | |
|---|---|---|---|
| Power Source Model | – | VR-400Ⅱ | |
| Supported Welding Processes | – | DC MMA / SMAW (Stick Welding) | |
| Rated Input Voltage | V, Hz | 3-Phase, 380V ±10%, 50/60 Hz | |
| Rated Input Capacity | kVA (kW) | 17.5 kVA (16.6 kW) | |
| Output Current Range | A | 10 ～ 400 A | |
| Rated Duty Cycle | % | 60% | |
| Dimensions (W×D×H) | mm | 328 × 596 × 580 | |
| Net Weight | kg | 52.9 kg | |
🔧 Engineering & Operational Guide
- Arc Force Regulation: When welding vertical-up or overhead joints with basic low-hydrogen electrodes (E7018), increase the dynamic Arc Force setting to prevent electrode freezing in the puddle during short-arc manipulation.
- Long Cable Operations: In shipyard and structural erection sites requiring welding cables over 50 meters, upgrade cable cross-sectional area to at least 70 mm² to minimize voltage drop and maintain arc starting vigor.
- Inverter Dust Protection: Regularly blow out the internal heat sinks and IGBT module cooling fins with dry compressed air (max 3 bar) to prevent metallic dust buildup from compromising thermal dissipation.
📞 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.
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