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Midland Tool

Miller Dynasty® 300 Series TIG/Stick Welding Power Source

Item # 951937 Category Tag
  • Intuitive Interface LCD Display – Ensure proper machine setup and parameter selection with informative on-screen explanations and dynamic images.
  • Program Memory – Allows easy naming, saving and recalling of favorite weld settings.
  • Pro-Set Feature (professional settings) – Eliminates the guesswork when setting weld parameters. Use Pro-Set when you want the speed, convenience and confidence of pre-set controls. Simply select the feature and adjust until Pro-Set appears on the display. The Pro-Set feature is available for Balance, Frequency, Pulse and DIG parameters.
  • Locks and Limits – Provides control of the weld parameter ranges minimizing deviations from the welding procedure specifications (WPS).
  • QuietPulse™  – Activated by changing the waveshape for DC pulse welding, creating a slower, more fluid transition between the background and peak amperage to create the least possible audible noise.
  • USB Port – Provides the ability to easily update software, back-up settings and transfer saved weld programs from one unit to the next.
  • Auto-Line:  Allows for any input voltage hookup (120 – 480 V) with no manual linking, providing convenience in any job setting. Ideal solution for dirty or
    unreliable power.
  • Stick Features – Tailored arc control (DIG) allows the arc characteristics to be changed for specific applications and electrodes. Smooth running 7018 or stiffer, more penetrating 6010. Hot Start™ adaptive control provides positive arc starts without sticking.
  • MIG – CV output of the power source gives this unit MIG process capabilities when paired with an ArcReach® 8 or 12 (or other voltage-sensing feeder).
  • Fan-On-Demand™ power source cooling system operates only when needed, reducing noise, energy of contaminants pulled though the machine.
  • Blue Lightning™ – High-frequency (HF) arc starter for non-contact arc initiation. Provides more consistent arc starts and greater reliability compared to traditional HF arc starters.
  • Cooler-On-Demand™ – Feature operates the auxiliary cooling system only when needed, reducing noise, energy use, and airborne contaminants pulled through the cooler.



Maintenance and Repair


Stick (SMAW)

Weldable Metals

Specialty Metals
Stainless Steel

Out Connection


Input Power

208-600 V
3-phase or 1-phase power

Amperage Range

1-300 A (DC)
2-300 A (AC)

Rated Output

250 A at 20 V
60% duty cycle

Input Phase


Input Hz

50 / 60 Hz

Current Type


Weld Output

250 A at 20 V
60% duty cycle

Max Open Circuit Voltage

60 VDC


13.6 in H x 8.6 in W x 22.5 in L


55 lbs


Mounted on a 4-wheel cart