OTC DAIHEN MR315 / MR400 Thyristor DC MMA Welding System
The OTC DAIHEN MR Series (MR315, MR400) represents time-tested industrial durability in Manual Metal Arc (MMA/SMAW) welding. Utilizing classic thyristor phase-control technology and heavy-duty copper transformer coils, these DC power sources deliver unyielding current stability and deep weld penetration that modern lightweight inverters cannot replicate under extreme mechanical abuse. Perfectly suited for boiler manufacturing, mining equipment maintenance, and heavy steel erection, the MR series ignores severe grid voltage fluctuations and heavy airborne dust, providing welders with an aggressive, highly controllable arc for all structural electrode classifications.
⚙️ Core Technical Specifications & Performance Data
| Specification Parameter | MR-315 | MR-400 |
|---|---|---|
| Rated Input Voltage | 3-Phase, 380V ±10%, 50/60 Hz | 3-Phase, 380V ±10%, 50/60 Hz |
| Rated Input Capacity | 18.0 kVA (14.4 kW) | 26.3 kVA (20.4 kW) |
| Output Current Range | 20 ～ 315 A | 40 ～ 400 A |
| Rated Duty Cycle | 60% | 60% |
| Dimensions (W×D×H) | 348 × 592 × 642 mm | 400 × 607 × 770 mm |
| Net Weight | 113 kg | 145 kg |
🔧 Engineering & Operational Guide
- Thyristor Phase Control Advantage: The robust transformer and thyristor architecture provides superior arc vigor and arc-length compensation when welding over rust, mill scale, or heavy primer coatings in structural field repairs.
- Remote Control Pendant: Connect the optional wired remote control box to allow welders working inside boilers or atop structural scaffolding to fine-tune welding current instantly without returning to the power source.
- Main Transformer Maintenance: In heavy manufacturing environments, inspect the internal main transformer windings annually. Clean off accumulated industrial grime to maintain optimal transformer heat dissipation and prevent dielectric breakdown.
📞 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.
