The Güde Uni-Mig 125 SYN is a multiprocess inverter welder for hobby use, with adjustable welding current from 20–120 A, 230 V single-phase power supply, synergic wire feed and IGBT inverter technology. It supports MIG/MAG, flux-cored wire, electrode welding (MMA) and TIG with an optional torch. Distributed in Italy by Krollit, official Güde distributor since 2007.
- Processes: MIG/MAG, flux-cored wire, electrode (MMA), optional TIG
- Welding current: 20–120 A
- Power supply: 230 V single-phase, 50 Hz
- Maximum input power: 4.06 kVA
- Duty cycle (ED) at max current: 15%
- IGBT inverter technology with continuous adjustment
- Wire feed with synergic function
- ANTI-STICK function
- Recommended material thickness: 1–8 mm
- 1 kg plastic wire spools
- 2 m torch
- Net weight: 7 kg
Who uses the Uni-Mig 125 SYN and what for
It is the most compact machine in the Güde inverter range, designed for hobby users, DIY enthusiasts and small home repairs on steel from 1 to 8 mm. The 230 V single-phase supply and weight of only 7 kg make it easy to connect to a household circuit and move around. It covers occasional, short-duration jobs: small welds, repairs to tools, gates, brackets and supports. The ability to use MIG/MAG, flux-cored wire and MMA electrodes, plus TIG with the optional torch, makes it a single solution for beginners and occasional welding needs.
Synergic technology and IGBT inverter
The synergic wire feed automatically sets the wire speed after selecting the process, wire diameter and material thickness, helping less experienced users achieve consistent results. IGBT inverter technology enables fast switching and precise current adjustment, simplifying thin-sheet welding and reducing spatter. The ANTI-STICK function prevents the electrode from sticking to the workpiece in MMA mode.
Who the Uni-Mig 125 SYN is suitable for
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Profile
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Suitability
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Reason
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Hobby user and beginner
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Suitable
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230 V single-phase, 7 kg, synergic wire feed and ANTI-STICK for easy use
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Small home repairs
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Suitable
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1–8 mm thickness and 4 processes in one compact, portable machine
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Occasional thin-sheet welding
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Suitable
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IGBT inverter and continuous 20–120 A adjustment reduce spatter
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Professional workshop or continuous use
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Not recommended
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15% duty cycle and max 1 kg spools are intended for short, occasional jobs
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Not recommended for: continuous professional use, long welds or production work, where a higher duty cycle and larger spools are required, and for aluminium or light alloys without the optional TIG torch and dedicated shielding gas.
General technical specifications
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Mains voltage
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230 V
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Frequency
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50 Hz
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Protection class
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I
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Protection rating (IP)
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21S
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Insulation class
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H
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No-load power
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36,4 W
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Efficiency
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82%
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Maximum mains input power (230 V)
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4,06 kVA
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Protection, time-delay
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16 A
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No-load voltage
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63 V
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Number of settings
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Continuous
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Thermal overload protection
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Yes
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Welding capacity
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Maximum welding current (230 V)
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120 A
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Welding current range
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20–120 A
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Duty cycle (ED) at max current
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15%
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Recommended material thickness
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1–8 mm
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Wire diameter (flux-cored wire)
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0,9 mm
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Maximum wire spool
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1 kg
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Parameters by process
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Process
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Current range
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Notes
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MMA (electrode)
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20–100 A
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ANTI-STICK; electrodes 1.6–3.2 mm
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MIG/MAG
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20–120 A
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Synergic wire feed
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TIG (optional)
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20–100 A
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Requires torch 41690
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Dimensions and weight
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Dimensions (LxWxH)
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380 x 300 x 285 mm
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Package dimensions (LxWxH)
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390 x 280 x 380 mm
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Torch length
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2 m
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Net weight
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7 kg
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Gross weight
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8,5 kg
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GTIN
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4015671516831
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Item code
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20078
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Standard equipment
- 2 m torch
- 1.5 m ground cable with ground clamp
- Electrode holder
- 3 wire guide tips (0.6 / 0.8 / 0.9 mm)
- 1 gas nozzle
- Welding mask
- Chipping hammer with brush
- 0.45 kg flux-cored wire
- Powder-coated sheet-steel housing
- Thermal overload protection
Optional accessories
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Code
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Description
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20038
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Welder trolley
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16921
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Automatic welding helmet GSH-TC-2
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16922
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Automatic welding helmet GSH-K
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16924
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Automatic welding helmet GSH 180-TC-2
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16975
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5-finger welding gloves 6120
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41690
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Complete TIG welding equipment
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Frequently asked questions
Does the Uni-Mig 125 SYN work from a normal 230 V household socket?
Yes. The machine runs on 230 V single-phase power with a 16 A time-delay protection and a maximum input of only 4.06 kVA, so it can easily be connected to a household electrical system without a dedicated installation.
The 15% duty cycle indicates that it is designed for short, occasional jobs rather than continuous use. After prolonged welding, the thermal protection may activate to allow cooling. For questions about the electrical system: +39 0825-1494022.
Which welding processes are ready to use when purchased?
MIG/MAG, flux-cored wire and electrode welding (MMA) are ready as standard, with 20–120 A current. TIG is possible only by adding the optional torch 41690.
In MMA mode it handles electrodes from 1.6 to 3.2 mm with an ANTI-STICK function that prevents sticking to the workpiece. The synergic wire feed automatically sets the speed after selecting process, wire diameter and thickness, simplifying use for beginners.
What steel thickness can it weld?
The recommended material thickness is 1–8 mm, with continuously adjustable current from 20 to 120 A. It is suitable for thin sheet metal and small household repairs.
IGBT inverter technology allows precise current adjustment, useful on thin sheet where it reduces spatter. For thicker materials or frequent use, a model with higher power and duty cycle is preferable.
Which wire spools does it accept, and is filler material included?
It accepts 1 kg plastic spools. It is supplied as standard with 3 wire guide tips (0.6 / 0.8 / 0.9 mm) and a 0.45 kg spool of flux-cored wire, so you can start welding immediately without gas.
The included flux-cored wire enables welding without a shielding-gas cylinder, which is practical for initial jobs. The synergic wire feed maintains a constant speed suited to the selected diameter, reducing jams.
How do service and spare parts work in Italy?
Technical support is provided in Italian and original Güde spare parts are available from Krollit's warehouse in Monteforte Irpino (AV). Support: +39 0825-1494022.
Standardised accessories such as nozzles and wire guide tips use widely available consumables. The powder-coated sheet-steel housing and thermal protection support long-term domestic use.
