VR400Ⅱ Professional MMA Welding Machines

OTC DAIHEN VR400Ⅱ IGBT Inverter DC Stick Welder

The VR400Ⅱ is a next‑generation DC stick welder from OTC DAIHEN, featuring IGBT inverter control for easy arc starting. Its perfect constant‑current characteristic ensures an extremely stable welding process. A standard arc force function effectively prevents electrode sticking, improving smooth operation. The compact, lightweight design (only 52.9kg) makes it easy to move and combine with other power sources on site. It is widely used in oil & gas pipelines, pressure vessels, construction, and repair work, and is capable of all‑position welding with cellulose electrodes. Comprehensive safety protections guarantee reliable operation.

✨ Key Technology Advantages

• IGBT inverter control — Easy arc starting, stable arc, high weld quality.

• Perfect constant‑current characteristic — Extremely stable, consistent welding.

• Standard arc force function — Prevents electrode sticking, smooth operation.

• Compact & lightweight — Only 52.9kg, easy to move and stack.

• Cellulose electrode capable — All‑position welding for pipelines.

• Multiple safety protections — Overcurrent, overheat, etc., for safe use.

• Wide current range — 10-400A, 60% duty cycle for versatile applications.

🔧 Primary Applications

Oil & gas pipeline welding, pressure vessel fabrication, construction steel installation, on‑site repairs, especially where portability and cellulose electrode welding are required.

📊 OTC DAIHEN VR400Ⅱ Technical Specifications