Migatronic Sigma Galaxy 400 is an inverter MIG/MAG power source with pulse and double pulse, with adjustment from 15 to 400 A. The duty cycle at a temperature of 40°C is 400 A at 40% and 280 A at 100%, and the arc voltage runs from 14.6 to 36 V. The supply is 3 x 400 V with a 28 A fuse, and the torch is liquid cooled.
What this machine is for
This is a source for heavy industry, shipyards and plants prefabricating high alloy steels and aluminium. Double pulse orders the ripple on aluminium and on stainless steel, giving a face close to a TIG bead at a pace typical for MIG/MAG. The synergic programs set the parameters once you point to the material and the wire, so repeatability does not rest on the operator's skill alone, and the welds can meet the requirements of class B to ISO 5817.
The machine has three solutions of its own from Migatronic. IGC steers the flow of shielding gas in real time, in the ignition phase as well, where normal regulators lose the most gas. The maker gives a saving of up to 50%, and a calmer gas flow also limits porosity in the weld. IAC watches droplet transfer in the short arc and reacts before the short circuit, so the root run in pipes and plate is surer, also with changes of the free wire stick out and with wider gaps.
Power ARC narrows and focuses the arc. The maker gives up to 30% deeper penetration than with a classic spray arc, which lets you reduce the bevel angle, use less wire and put in less heat, and so straighten less after welding. To that comes air carbon arc gouging with a carbon electrode, that is removing faulty runs of welds and preparing the groove for welding again.
The arc voltage range from 14.6 V to 36 V covers the short arc on thin parts and the spray arc on thick sections. Together with current adjustment from 15 A that gives one station for very different tasks, from sheet to a load bearing structure.
Features and equipment
- Pulse and double pulse: an even ripple on aluminium and on stainless steel, less spatter and control over the amount of heat.
- Synergic programs: you choose the material and the wire, and the controller picks the rest.
- IGC, that is gas flow control: gas dosing in real time, per the maker a saving of up to 50% and a calmer, laminar flow.
- IAC, that is short arc control: the system predicts the short circuit and steadies the arc, which helps with the root run without access from inside.
- Power ARC: a focused arc with penetration deeper per the maker by as much as 30%, for thick steel structures.
- Air carbon arc gouging: weld repairs and edge preparation with a carbon electrode.
- Liquid cooling built into the source.
- A graphic interface readable without knowing the language of the menu.
- Operating manual in Polish and a card of synergic programs in PDF format.
Air carbon arc gouging also makes this source a repair machine. A current of 400 A is enough to remove faulty runs of welds with a carbon electrode and to prepare the groove for welding again, so you carry out repairs where you weld.
Synergic programs and a memory of settings shorten the training of less experienced operators. The controller watches the relation between the voltage and the wire speed, and the welder trims the arc length for the position and the thickness of the material.
Technical data
| Brand | Migatronic |
|---|---|
| Model | Sigma Galaxy 400 |
| Supply | 3 x 400 V |
| Mains fuse | 28 A |
| Welding current range | from 15 to 400 A |
| Duty cycle at 40°C | 400 A at 40%, 280 A at 100% |
| Arc voltage range | from 14.6 V to 36 V |
| Processes | synergic MIG/MAG, pulse, double pulse, air carbon arc gouging |
| Own functions | IGC, IAC, Power ARC |
| Cooling | liquid, built in |
| MIG torch | new, 4 m, liquid cooled |
| Earth cable | 3 m |
| Supply cable | 5 m |
The gas flow control works in the background and needs no handling, but you will see the gain from it only on the cylinder bill after a few weeks of work. It is the same with the short arc control system: at the root what counts is how many corrections are left after the first pass.
What you get
- Migatronic Sigma Galaxy 400 power source
- new MIG welding torch 4 m, liquid cooled
- earth cable 3 m
- supply cable 5 m
- operating manual in Polish and a card of synergic programs
What to watch out for
Double pulse needs a different torch technique than a normal MIG/MAG: the speed of your hand has to match the rhythm of the pulsing, otherwise the ripple comes out uneven. That is a matter of a few tries, but without them the effect close to TIG will not appear by itself. On stainless steel watch the amount of heat as well, because the corrosion resistance of the joint depends on it.
The supply is 3 x 400 V with a 28 A fuse. The duty cycle counted at 40°C is 400 A at 40% and 280 A at 100%, so for continuous work plan the current closer to 280 A. Liquid cooling is built into the source, and you check the fluid level and the tightness of the circuit after delivery. For gouging you need a separate carbon holder and compressed air.
The IGC and IAC functions pay off only once you set them for your joints and your gas, so plan a few tries on scrap. Before you buy settle which wire diameters you want to feed, because the set of rolls, the guide liner and the contact tips depend on that.
How we sell used machines
This unit was checked in our service workshop in Krotoszyn with measurements to PN-EN 60974-4 and a load test. The price includes the first year of the basic service package: an inspection with cleaning of the machine and a validation measurement. Further years can be added. We ship across the European Union, collection in person by appointment.
