ROHR SMINI 140NI: DUAL MMA & ARC 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

364 in stock (can be backordered)



The power source offered by this machine is stronger, more concentrated and produces a more stable arc. Its response is quicker and it can even be adjusted for speciality welding to make the arc softer or harder.

It can weld stainless steel, alloy steel, carbon steel, copper and other colour metal. It can apply to electrodes of different specifications and materials, including acidity and fibre. It can operate at high altitude, the open air and inside and outside environments. It is compact in volume, light in weight, easy to install and operate.


Key Features:

  • For repair and maintenance work indoors and outdoors
  • Suitable for stick/electrode welding (MMA welding)
  • Body made of powder coated steel sheet
  • Compact and robust construction
  • Hot-start function facilitates ignition of the arc
  • Mobile use

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 vehicles, fabrication, house maintenance or more unconventional work where specialist materials require more advanced features.



  • Voltage: 1 Phase AC 240V ±15%
  • 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

  • 1 x Welder
  • 1 x MMA Clamp
  • 1 x Earth Clamp
  • 1 x Strap
  • 1 x Brush
  • 1 x Instruction Manual
Mini Arc Inverter Welder

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 140NI: DUAL MMA & ARC Inverter Welder

  1. geokovac

    Great little welder.Wasn’t sure about it at first,but Im glad I bought it.Work as it should,neatly fits into the provided carry case,and its light.Got all what you need to start except the rods.This model could be turned into a tig,just need to get the right attachments.Used it a few times now,no problem with it whatsoever.Burn the 2.5 mm rods with ease.

  2. Mike Griffiths

    Brilliant little welder. Arrived yesterday and already put to work on the farm. Has done everything I hoped.

  3. Simon Nixon

    This product is great for light to medium jobs and is light and portable. It even comes in a handy case to carry it, gloves and welding sticks.

    Great value for money.

  4. Justin Chaney

    Fantastic little unit for the price. Small, portable and easy to use, much better than my old bulky arc welder. Super fast delivery. Really pleased.

  5. Peter Whittard

    great little welder just the job
    Super fast delivery 
    Comes with a very good hard case
    Highly recommend

  6. Peter Whittard

    Great purchase, super fast delivery
    Great little welder just the job and very comes in a very handy strong case
    Very pleased and recommend

  7. David Staley

    Incredible value for money even better delivery ordered first thing on Monday morning in my hand at 07:50 Tuesday morning.
    The product build quality is excellent. A really good welder .

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