UNIMIG Razorweld 250 SWF MIG / TIG / MMA


Razorweld 250 SWF L
Razorweld 250 SWF Front
Razorweld 250 SWF R 2
Razorweld 250 SWF L
Razorweld 250 SWF Front
Razorweld 250 SWF R 2

UNIMIG Razorweld 250 SWF MIG / TIG / MMA

Available in stock


The MIG250SWF is an inverter-based MIG welding machine with added MMA and DC TIG function. The machine is equipped with a separate 4 roll gear driven wire feeder and 10m interconnecting cables. The MIG function allows you to weld with both Gas and  Gasless wire applications. Adjustment of Voltage & Wire Feed at the feeder makes for easy setting of welding parameters and gives the convenience of remote adjustment from the power source.

Crater Current setting delivers perfect finishing of the weld, the  electronic Inductance offers fine adjustment of the arc characteristic and Burn Back adjustment leaves the wire out ready for the next weld. Wire Inch and Gas Check provides set up of wire feed and gas setting without wastage of wire or gas. Added MMA welding capability delivers easy and high quality welding using electrodes, including cast Iron, stainless and low hydrogen.

Connection of the 26V TIG torch provides quality lift arc DC TIG welding of steel, stainless steel and copper. 240v single phase gives great portability, providing more flexible use for site and home workshop locations. Ideal for general engineers, maintenance workshop and rural workshops.

Designed and built to our specification. Certified to – AS/NZ60974-1

Key Features

Latest IGBT inverter technology
MIG/MAG with Gas and Gasless wire function
VRD (Voltage Reduction Device)
DC TIG welding with lift arc start
Stepless Voltage & Wire Speed controls at wire feeder
Variable Inductance
Burn Back control
2T/4T trigger function
Adjustable Crater Current function
Gas Check
Wire Inch
Digital Volt / Amp meters
Geared 4 roll wire feeder
Euro style MIG torch connection
10m interconnecting cables
Heavy duty trolley with tool draw
Spool Gun / Push Pull Ready

Quick Overview

Part No: KUMJR250SWF


The Razorweld 250 SWF is the ideal machine for light to medium industrial work. The machine is single phase 240V and also portable and perfect for workshop use. With the added benefit of the Seperate Wire Feeder (SWF) the operator is able to remove the wire feeder from the power source up to a distance of 10 metres. This is ideal in workshops when moving the complete machine isn’t an option. 

The MIG function provides superb arc characteristics when using either Gas Shielded or Gasless Wires. The machine features an adjustable Burnback control and easy to use panel layout to get your job done faster. 

The machine is also a very capable MMA (Stick) welder capable of running most MMA Electrodes up to 4.0mm. An added feature of Hot Start helps when striking an Arc to minimise the Electrode sticking to the work piece. 

The Razorweld 250SWF is Push Pull ready and is capable of running a 6 metre Push Pull gun which is ideal for Aluminium work adding yet another feature to this machines capabilities.

Another feature is the Razorweld 250SWF is also a DC TIG welder with Lift Arc function. DC TIG will allow welding of materials such as Mild and Stainless Steels as well as Bronze, Copper and Chrome Moly’s.

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




The machine features a geared roller drive unit, for consistent smooth wire feed, this assists with using longer MIG Torches.



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 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



1 x Razor MIG 250 SWF Power Source

1 x SWF Wire Feeder

1 x SB24 4 metre MIG Torch

1 x 10 metre Arc Welding lead set including twist lock electrode holder & 500 Amp earth clamp

1 x 10 metre Interconnecting cables

1 x MIG Trolley

1 x UNIMIG Twin Gauge Argon Regulator

1 x 2 metre Gas Hose with connections

1 x Instruction Manual

Ready to buy? Find a LOCAL dealer



  • Part NumberKUMJR250SWF
  • Primary Input Voltage240V 1 Phase
  • Rated Input Power KVA10.8 KVA
  • ieff AMPS26.6A MIG / 28.0A MMA
  • Rated Output MIG30A/15.5V - 250A/26.5V
  • Rated Output MMA10A/20.4V - 250A/30.0V
  • Welding Current Range10 - 250 Amps
  • Duty Cycle 40 Deg C - MIG35% @ 250 Amps
  • Duty Cycle 40 Deg C - MMA35% @ 225 Amps
  • Dimensions (mm)630 x 235 x 420mm
  • Weight Power Source (Kgs)40.6
  • Weight Wire Feeder (Kgs)14

Optional extras & accessories