MR315 MR400 Professional MMA Welding Machines

OTC DAIHEN MR315 / MR400 DC Stick Welders

The MR315 and MR400 are classic thyristor‑controlled DC stick welders from OTC DAIHEN. Their perfect constant‑current characteristic delivers an extremely stable welding arc for consistent weld quality. A built‑in arc force function effectively prevents electrode sticking, ensuring smooth operation. With a high duty cycle, they excel in medium and thick plate welding. The MR315 covers 20-315A, while the MR400 offers 40-400A, accommodating various thicknesses. Ruggedly built, they are widely used in steel structures, pressure vessels, pipe installation, and heavy machinery.

✨ Key Technology Advantages

• Constant current characteristic — Extremely stable arc, consistent weld quality.

• Arc force function — Prevents electrode sticking, smooth operation.

• High duty cycle — 60% duty cycle for continuous medium/thick plate welding.

• Wide current range — MR315 (20-315A), MR400 (40-400A).

• Rugged & durable — Classic thyristor technology for harsh industrial environments.

🔧 Primary Applications

Steel structure fabrication, pressure vessels, pipe welding, heavy machinery, shipbuilding, bridge construction – medium and thick plate welding.

📊 OTC DAIHEN MR315 / MR400 Technical Specifications Comparison