Miller Dynasty 300 – Premium AC/DC TIG & Stick Welder

Item No. MR907818003

Overview

The Miller Dynasty 300 is a high-performance welding system engineered for demanding industrial applications, delivering both exceptional quality and flexibility. At just 25 kg it’s surprisingly portable for its power class — yet robust enough to handle heavy-duty TIG and stick tasks.

Featuring a highly efficient inverter design and Auto-Line™ technology (capable of input voltages from 208-600 V without manual linking), the Dynasty 300 is built for on-site versatility and uptime in dynamic environments.

Key Features

• AC/DC TIG (GTAW) and Stick (SMAW) capability — covers pulsed TIG, air carbon arc (CAC-A) and more.
• Auto-Line™ input flexibility — no manual input link changes when moving between different site power supplies.
• Intuitive LCD interface shows parameter settings and visual setup cues, reducing guess-work for operators.
• Program Memory to save custom weld settings. Includes USB port for firmware updates and transferring saved programs between machines.
• Compact footprint: 352 mm (H) × 216 mm (W) × 555 mm (D); approx. 25 kg.

Typical Applications

Designed for environments where precision and reliability matter:

• Aerospace
• Construction & infrastructure
• Heavy fabrication & manufacturing
• Railcar repair
• Ship & boat building
• High-purity / process work

Why It Works For You

• Portable but serious: Ideal for both site work and fixed workshop use thanks to its low weight for a 300 A class machine.
• One machine, many jobs: Handles a wide range of materials, thicknesses and processes (TIG and Stick in one unit).
• Consistent results across operators: Save and recall proven settings for repeatable quality.
• Input voltage flexibility: Auto-Line™ automatically adapts to available power, reducing downtime and setup hassle.

Specification Highlights

• TIG (GTAW) – 3-Phase: 2–300 A (AC) / 1–300 A (DC)
  60% duty cycle: 250 A @ 20 V
• TIG (GTAW) – 1-Phase: Same current range
  60% duty cycle: 250 A @ 20 V
• Stick (SMAW) – 3-Phase: 5–300 A
  60% duty cycle: 250 A @ 30 V
• Max open-circuit voltage: 60 V DC
• Dimensions: 352 mm (H) × 216 mm (W) × 555 mm (D)
• Weight: approx. 25 kg

Brand

Miller is known globally for premium welding equipment. The Dynasty series is trusted by industry professionals for clean arc starts, intuitive controls and long-term durability in demanding production environments.

Ready for a Quote?

Talk to us today about package pricing, lead time and accessories for the Miller Dynasty 300 (MR907818003).