Syncrowave® 400 – TIG Runner


For fabricators who need more TIG welding productivity and lower operating costs, new Miller Syncrowave machines are the energy efficient TIG welding power sources that make it easier for any welder to get more work done.

For fabricators who need more TIG welding productivity and lower operating costs, new Miller Syncrowave machines are the energy efficient TIG welding power sources that make it easier for any welder to get more work done.

Fully integrated system

System where the cooling unit runs off the power source and forms a robust and sturdy system with the integrated running gear. The machine is easy to manoeuvre and easy to position at the weld station.


All interaction points with the machine and cooler can be found on the front panels. Turn the machine on from the control panel, check the flow of cooling liquid and top up if necessary, without having to move the machine and without having to access difficult to reach areas.

Comfort and ergonomics

The control panel of the Syncrowave is positioned at the perfect hight. Easy to access all the settings without having to kneel by the machine.

Easy to use

The control panel is giving you access only to the relevant settings for the process you have selected. This keeps the panel clean and simple to understand, making it easy to adjust parameters, and means less time training new employees and more time getting work done.


Is a unique feature on the Miller® Syncrowave. By one touch of a button, the machine reverts to the factory pre-set parameters which will get you started in no time. Simply set the welding amperage and Go.

Perfect arc starts with Blue Lightning™

By selecting the tungsten diameter, you are using, the machine will pre-set a number of critical arc start parameters. This ensure accurate and reliable arc starts every time.

Arc stability

The Miller brand is synonymous with world class TIG arc stability and performance. The Syncrowave is no exception. Enjoy full control of the arc and the weld puddle.

AC TIG Features

Balance control provides adjustable oxide removal which is essential for creating the highest quality aluminum welds.

DC TIG Features

Pulse. Pulsing can increase puddle agitation, arc stability and travel speeds while reducing heat input and distortion.

DC Stick Features

DIG control allows the arc characteristics to be changed for specific applications and electrodes. Lower the DIG setting for smooth running electrodes like E7018 and increase the DIG setting for stiffer, more penetrating electrodes like E6010.
Hot Start™ adaptive control provides positive arc starts without sticking.


Power source cooling system operates only when needed, reducing noise, energy use and the amount of contaminants pulled though the machine.

Wind Tunnel Technology™

Protects internal electrical components from airborne contaminants, extending the product life.

Coolmate™ 3S cooler

11 liters cooling system equipped with a visual flow indicator ensures that the coolant is flowing. An external coolant filter stops foreign objects from entering the water-cooled torch cable for better flow and longer life. Extended cooling capacity ensures maximum productivity. Threeyear cooler warranty.

Arc timer/cycle counter

Records actual welding time and number of arc starts. Great for estimating job costs.

Welding aluminum?

Oxides that form on aluminum melt at temperatures over 2000°C (3.700°F) The aluminum material that is located under this layer of oxide melts at 649°C (1.200°F) The AC squarewave welding current of the Syncrowave 300 automatically removes the layer of oxide which is necessary for producing high-quality welds.

Do you have power fluctuations?

The Syncrowave 300 compensates for power fluctuation without changing your welding parameters. Line voltage compensation works on fluctuating power ±10 percent.

Easy-load cylinder rack

Minimizes cylinder lifting. Cylinder is not included.


Provides AC or DC arc initiation without the use of high frequency.

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.


Adjusts the length of postflow time based on the amperage setting, shielding your tungsten and eliminating the need to set the postflow time.

Miller EuroTorch

Read more in Miller EuroTorch brochure.

What’s included
  • Power Source
  • Water Cooler
  • Running Gear


Pulsed DC TIG (GTAW-P)
Stick (SMAW)


General specification
Title Syncrowave® 400 – TIG Runner
Industries Interests Precision metal fabrication
Maintenance and repair
Light and heavy manufacturing
Tube and pipe
Material Thickness
Weldable Metals
Input Voltage 380/400 V
Input Phase 3-phase power
Input Hz 50 Hz
Amperage Range 5-400 A
Current Type AC/DC
Rated Output 400 A at 26 V, 30% duty cycle
300 A at 22 V, 60% duty cycle
Max Open Circuit Voltage 70 VDC
Weld Output CC
Net Width 521 mm (20.5 in.)
Net Height 1114 mm (43.9 in.)
Net Length 921 mm (36.3 in.)
Net Weight 95.7 kg (211 lb.)
Warranty 3 Years
Miller’s True Blue Warranty