MILLER Dynasty 400 Arc / Tig Welder Miller MR907717002

Miller Dynasty® 400 AC/DC Arc & TIG Welder – Industrial Power Source (MR907717002)

The Miller Dynasty® 400 AC/DC Arc & TIG Welder is a high-performance, industrial-grade welding power source engineered for precision aluminum welding, exotic materials, heavy fabrication, and demanding production environments. Offering exceptional arc control, advanced waveform technology, and proven Miller reliability, the Dynasty 400 is built for professionals who require maximum output, consistency, and durability.

Designed for both AC/DC TIG (GTAW) and AC/DC Stick (SMAW) welding, this machine delivers outstanding performance across a wide range of applications while maintaining excellent energy efficiency and operator comfort.

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AC TIG Welding Features

• Independent Amplitude / Amperage Control
  Precisely control heat input to the workpiece and electrode for superior weld quality.

• Balance Control (Extended Ranges)
  Adjustable oxide removal essential for producing high-quality aluminum welds.

• AC Frequency Control
  Adjusts arc cone width to improve directional control and penetration.

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DC TIG Welding Features

• Exceptionally Smooth and Precise Arc
  Ideal for welding exotic and high-value materials.

• AC/DC Pulse Welding

  • Improves arc stability and puddle agitation

  • Increases travel speed

  • Reduces heat input and distortion

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AC/DC Stick Welding Features

• DIG Control
  Tailor arc characteristics to suit specific electrodes and applications

  • Lower DIG for smooth-running electrodes (E7018)

  • Higher DIG for stiffer, penetrating electrodes (E6010)

• Hot Start™ Adaptive Control
  Ensures positive arc starts without electrode sticking.

• AC Frequency Control (Stick Mode)
  Adds arc stability for smoother AC stick welding.

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Advanced AC Waveforms

• Advanced Squarewave – Deep penetration, fast-freezing puddle, high travel speeds

• Soft Squarewave – Smooth, buttery arc with excellent puddle control and wetting

• Sine Wave – Traditional arc feel with quiet operation and good wetting

• Triangular Wave – Reduced heat input, ideal for thin aluminum and fast travel speeds

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Arc Starting & Power Management

Lift-Arc™ Starting

• AC or DC arc initiation without high frequency

• Ideal for sensitive environments

Blue Lightning™ Technology

• High-frequency, non-contact arc starting

• Provides consistent arc starts and enhanced reliability

Fan-On-Demand™

• Cooling system operates only when required

• Reduces noise, energy consumption, and airborne contaminants

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Productivity, Safety & System Protection

Program Memory

• 9 independent memory slots

• Save and recall welding parameters for consistent results

Auto-Postflow

• Automatically calculates postflow time based on amperage

• Preserves tungsten and reduces weld porosity

Meter Calibration

• Allows meter calibration for certification and compliance

Cooler Power Supply (CPS)

• Integrated 120V receptacle for Coolmate™ 3.5 water cooler

VRD (Voltage Reduction Device)

• AS1672.2:2007 Category C compliant

• Improves operator safety in hazardous environments

• VRD can be disabled via Advanced Tech Menu

Wind Tunnel Technology™

• Protects internal electronics from airborne contaminants

• Extends machine life in harsh industrial conditions

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Warranty & Package Details

• Warranty: 3-Year Miller True Blue® Warranty

• Price Includes: Machine only

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Product Information

• Model: Miller Dynasty® 400

• Processes: AC/DC TIG (GTAW), AC/DC Stick (SMAW)

• Cooling Compatibility: Coolmate™ 3.5

• Part Number / SKU: MR907717002