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unimig-razorweldRazorweld ARC140 is an inverter-based welding machine produced using the latest in IGBT technology. This machine is reliable, robust and stacked with features that you can expect from UNIMIG. The DC MMA welding capability delivers a smooth and incredibly stable arc allowing easy welding with electrodes producing high quality welds including cast Iron, stainless and low hydrogen.

The Razorweld ARC140 is equipped with DC Lift TIG Arc function that allows quality DC TIG welding of steel, stainless steel, bronze and copper. The Lift Arc function is superb and delivers perfect arc ignition. The Razor Arc 140 creates a remarkably smooth stable arc leading to high quality TIG welds.

The Razorweld ARC140 is an exceptional machine that is suitable for a wide range of applications including light industrial use, site welding, farming, along with repair and maintenance applications. The Razorweld Arc140 is packaged in a tough PVC carry case with your choice of MMA option accessories or MMA/TIG option accessories. The-ARC140 gives you the best of both worlds great portability, with the power to get the job done.

Built to our specification and manufactured in compliance to AS/NZ60974.1

Key Features
•    Latest IGBT inverter technology
•    Hot start (improves electrode starting)
•    VRD (Voltage Reduction Device)
•    Arc Force (boosts current to prevent electrode extinguishing)
•    Excellent arc stability with all electrodes
•    Lift Arc ignition (prevents tungsten sticking during arc ignition)
•    Ultra-smooth DC TIG welding current
•    Thermal overload protection
•    Generator compatible (recommend 9.0 KVA minimum)
•    Tolerant to variable power supplies

Quick Overview


Power and Portability

The Razorweld 140 DC MMA/TIG is a professional MMA/TIG Inverter capable of producing high quality welds. The machine is fitted with a 10 AMP plug as standard. The machine also features keyable VRD (Voltage Reduction Device) which is a benefit when wanting to run Low Hydrogen Electrodes. The Razor ARC 140 can run MMA Electrodes up to 3.25mm*.

The Razor Arc 140 also has the feature of Lift Arc TIG. Lift Arc is a form of arc ignition that is simple, safe and is far superior to scratch start.

Lift Arc ignition allows the arc to be easily started by simply touching the tungsten to the work piece then lifting it up to start the arc. This prolongs the Tungsten Electrode’s lifespan and helps maintain a clean Tungsten.

*Always refer to the recommended polarity setup as stated on the electrode packaging.


Keyable VRD

Voltage Reduction Device (VRD) is a safety feature when operating in MMA/Stick mode.
VRD reduces the maximum unloaded open circuit voltage across the output terminals. This makes the machine safer to use and is an industry standard in the welding industry.

Unimig has taken VRD to the next level by adding a Key which allows the user to switch the VRD on or off to assist in running electrodes which are harder to start such as Low Hydrogen Electrodes.


UNIMIG is pleased to offer a 3 year warranty on all Razorweld machine’s*.
UNIMIG offers warranty across Australia with four UNIMIG service centre’s in Sydney, Melbourne, Brisbane & Perth. We also have authorised service centres across Australia as well.UNIMIG’s focus is to assure the buyer is getting reliability, performance and peace of mind with a quality product.

UNIMIG also offers an additional 6 months warranty free of charge when you register your product online via the UNIMIG website.

*Please note warranty only applies to the power source only


Package Contents

The UNIMIG Razorweld 140 DC MMA/TIG is packaged ready to weld and includes,

  • 1 x Razor Arc 140 DC MMA/TIG Power Source
  • 1 x 4 metre Arc Welding lead set including twist lock electrode holder & 300 Amp earth clamp
  • 1 x Lightweight Heavy Duty PVC Carry Case
  • 1 x Machine Carry Strap
  • 1 x Instruction Manual


  • Part NumberKUMJRRW140CA
  • Primary Input Voltage240V 1 Phase
  • Rated Input Power KVA7 KVA
  • ieff AMPS9.7A MMA / 9.7A TIG
  • Rated Output140A / 25.6V MMA - 140A / 15.6 TIG
  • Welding Current Range10 - 140 Amps
  • No Load Voltage9V
  • Duty Cycle 40 Deg C - MMA15% @ 140Amps
  • Duty Cycle 40 Deg C - TIG DC20% @ 140AMps
  • Dimensions (mm)311 x 250 x 130
  • Weight (Kgs)4.7

Optional extras & accessories

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