TIG Welding Machine

OTC DAIHEN MR315T DC TIG/Pulse TIG/Stick Welder

The MR315T is a classic thyristor‑controlled DC TIG welder from OTC DAIHEN. Its unique constant‑current characteristic delivers a stable arc with a near 100% instantaneous arc start rate. Three welding modes — DC TIG, DC pulse TIG, and DC stick — enable high‑quality, efficient welding of materials such as mild steel, stainless steel, nickel alloys, and copper alloys. Low‑frequency pulse current produces uniform, aesthetically pleasing single‑side welding with back formation, and performs excellently on dissimilar metals, different thicknesses, and gapped workpieces. For multi‑layer welding, a combination of pulse TIG and stick welding boosts efficiency. Widely used in pressure vessels, petrochemical, stainless steel products, power construction, and on‑site fabrication.

✨ Key Technology Advantages

• Constant‑current characteristic — Stable arc, near 100% arc start.

• Three‑mode versatility — DC TIG, pulse TIG, stick welding for multiple materials.

• Low‑frequency pulse current — Single‑side welding with back formation, uniform beads.

• Excellent on dissimilar/gapped workpieces — Handles varying thickness and gaps.

• Efficient multi‑layer welding — Combine pulse TIG and stick for higher productivity.

• Wide application range — Pressure vessels, petrochemical, power, on‑site work.

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

🔧 Primary Applications

Pressure vessels, petrochemical pipelines, stainless steel fabrication, power construction, on‑site welding of steel structures – TIG welding of mild steel, stainless steel, nickel alloys, copper alloys, and stick welding.

📊 OTC DAIHEN MR315T Technical Specifications