ROHR SMINI-120NI ARC – MMA 120amp Inverter Welder


(7 reviews)
  • 12-month warranty and free to call UK based technical support line
  • Euro torch with a scratch start system
  • Runs off a standard UK 3 pin 13 amp plug
  • Includes a storage box for your welder and accessories – earth clamp, clipping hammer and wire brush
  • For experienced and DIY users alike with its intuitive design

Whether it’s aluminium bike frames or reviving your passion for steel sculpture, there’s a Röhr for the job and a Röhr for you!

Have a question? Contact our friendly, expert Röhr qualified staff here

275 in stock (can be backordered)


The SMINI-120NI Gives you Röhr Quality


When it comes to designing and manufacturing welders, Röhr have extensive, unparalleled knowledge. They combine breakthrough technologies to produce some of the most advanced and capable welding machines on the market.

Röhr welders are easy to use and perfectly suited to experienced and new users alike. You can carry out a huge range of welding including vehicle’s, fabrication, house maintenance or more unconventional work where specialist materials require more advanced features. Whether it’s aluminium bike frames or a revived passion for steel sculpture, there’s a Röhr for the job and a Röhr for you!

Exceed your Expectations

Röhr welders are built to last with high-quality components that will ensure reliability for occasional or regular users. This welder uses the latest inverter technologies to dramatically reduce the overall footprint. Inverters dramatically reduce the power required to weld by increasing efficiency by 30% and they produce a consistent power supply giving you the most stable welding arc.

Perfect for a Wide Variety of Welding

This welder is multi-use so you can weld low carbon steel, stainless steel and alloys

Dual “2-in-1” Portable Functionality

This welder uses MMA Arc welding which is ideal for most welding needs and is specifically designed to be highly portable due to its ultra-lightweight design and shoulder strap. The unit produces neat welds that leave you in no doubt that this high-quality welder is designed by Röhr.


  • Voltage: 1 Phase AC 240V
  • Frequency: 50/60HZ
  • Output Current: 20-120A
  • Rated Input Voltage: 24.8V
  • Duty Cycle: 45%
  • Power Factor: 0.73
  • Insulation Grade: F
  • Housing Protection: IP21

In The Box

  • Mini Arc Welder
  • MMA Clamp
  • Earth Clamp
  • Carry Strap
  • Brush
  • Instruction Manual
Rohr Mini Welder for beginners

The Latest IGBT Technology

IGBT is a bipolar transistor with an insulated gate electrode. This semi-conducting device is being increasingly used in power electronics because it combines the advantages of two transistor types: the easy controls of the field effect transistor and the fast switching and high breakdown voltage of the bipolar transistor. The IGBT also offers some robustness against short circuits because it limits the electrical continuity.

Featuring Hot Start

Hot Start automatically boosts the tension at the ignition of the arc, this function facilitates the electrical arc ignition. After ignition, the unit automatically returns to the pre-set voltage.


This function helps to prevent overheating of the electrode by switching off the welding current when the electrode sticks to the material.

MMA Arc Welding

MMA is electrode welding with a coated electrode.

Customer Reviews

7 reviews for ROHR SMINI-120NI ARC – MMA 120amp Inverter Welder


    Absolutely brilliant welder, very impressed with the quick delivery.

  2. Jim Inglis

    Bought via Amazon, arrived promptly, well packed, looks robust. Tried it on a high setting with a 1.5mm rod, found it a wee bit hard to strike but made a beautiful and strong weld. I had the setting slightly too high, but not bad for a first attempt. The fan is fairly noisy but sounds powerful. This should last and do all my needs. Well pleased.

  3. Jonathan

    Extremely satisfied with my little welder it’s a little welder with a lot of punch very very impressed

  4. Les

    Used this today and well impressed I did 24 welds on 50x50x4 box and made a frame it never missed a beat proper good bit of kit down side buy a good mask  but the machine 10 out 10 even comes in a strong box excellent value for the money

  5. David Harrison

    Unbelievable for its size arc start is impressive well worth the money


    I am extremely pleased with the performance of this welder, it strikes up very easily and runs so smoothly. It’s much better than my 40 year old welder which unfortunately passed away last week, delivery was second to none – it came within 2 days! Thank you Union Mart!

    BG from DD

  7. John Mcgartland

    great product at a great price

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