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Mig Welder SWF 425 amp 415V 3 phase Unimig Aluminium Steel Welding KUM425SWF

In stock
Special Price $4,995.00 Regular Price $5,672.78
Save 11.95% off

The WORKSHOP 425 SWF MIG Welder combines immense power with ultra-smooth arc characteristics. It has been designed for users who need a welder to do medium to heavy fabrication, as well as rural applications. It features 30 position switching, giving you the freedom to precisely dial in your welding settings, and a four geared roller drive unit for consistent smooth wire feeding. The high-quality copper-wound transformer with large cooling fans and motors maximises cooling and machine reliability.

Go to greater heights with the addition of the KT50 Separate Wire Feeder feed unit which covers you an extra 10 metres, giving you increased manoeuvrability. It also prevents dust and moisture fouling you wire with its smart enclosed system design meaning no contaminates in your welds.

Built To Last: Designed and manufactured with the best quality components for increased durability and reliability. Workshop series machines feature: Copper wound transformer and smoothing choke, large 300mm cooling fan with enclosed motor, to maximise cooling for high duty cycle operation.

Voltage Steps: 30 position switching, allows precise setting in small increments of welding voltage so the operator can achieve the correct weld penetration.

Geared Four Roller Drive: Geared four roller drive unit, featuring 40mm drive rollers for consistent smooth wire feed. Fitted to all workshop machines.

Package Contents: The UNIMIG Workshop 390 SWF is packaged ready to weld and includes:

  • 1 x Workshop 425 SWF Power Source
  • 1 x KT50 Wire Feeder
  • 1 x 4 metre SB38 MIG Torch
  • 1 x 10 metre 50mm Earth Lead
  • 1 x 10 metre Interconnecting Cables
  • 1 x UNI-MIG Twin Gauge Argon Regulator
  • 1 x 2 metre gas hose
  • 1 x Instruction Manual


UNIMIG is pleased to offer a 3 year warranty on all UNIMIG Workshop Series machine’s*.

*Please note warranty only applies to the power source only


  • Part NumberKUM425SWF
  • Primary Input Voltage415V 3 Phase
  • Voltage steps30
  • Duty Cycle 40 Deg C60% @ 400Amps / 100% @ 310Amps
  • Welding Voltage Range16 - 34V
  • Wire Size0.6 - 1.6mm Ferrous
  • 0.9 - 1.6mm Aluminium
  • 0.6 - 1.6mm Stainless Steel
  • 0.9 - 2.4mm Flux Cored
  • Dimensions (mm)1270 x 940 x 600
  • Weight (Kgs)182
  • Torch optionsSB38 4M & 5M / ARB 400 / 12ft / 15ft & 17ft TWC
  • OptionsAmp-Volt Meter - Part No: AVOPTION
More Information
New Yes
Dimension Width (cm) 94
Dimension Height (cm) 127
Dimension Length (cm) 60
Warranty 3 years
Condition New
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At Best Buys Online, we always strive to offer you the lowest shipping prices possible.

On each product page, we provide an online instant shipping quote with multiple options of shipping to your commercial address (for ex: business, farm, workshop) or your house and with or without tailgate.

To learn about our rates, please try our free instant online shipping calculator and you’ll get an immediate response - a shipping quote that is budget-friendly.


PO BOXES : NO parcels above 22kg and/or longer than 1meter can be sent to a PO Box. Signature is required.

1. Goods are shipped once payment is received in full. We strongly advise all customers that they provide a delivery address where someone is available to sign for the goods during business hours. Sometimes, a forklift will be required to unload at the destination. If customers don’t have means to unload, you may be required to pick it up from a designated courier depot, OR pay an extra fee for the tailgate to unload the item when delivering to your nominated address. Please send us a message or call us (03) 9210 0400 to arrange.

2. All courier companies will attempt delivery of your goods once. If no one is home when delivery is being attempted, a note will be left. A re-delivery will incur extra charges. All second deliveries need to be directly organised with the courier company and paid for before goods are delivered.

3. Once in the hands of the couriers, freight times are outside of our control. However all tracking details are forwarded via email upon dispatch and customers are welcome to contact the relevant freight company, or we are happy to attend to any queries you may have.

4. FREE SHIPPING PROMOTION: This only applies to customers in capital cities. Free Shipping does not apply to regional areas. We can send the item to the nearest freight depot, and we will charge you the difference in freight cost to the capital city and your pick-up location. Please call us on (03) 9210 0400 for further information.
PICK-UP OPTION (No Handling Fee applies)

This option allows you to pick up your order from our Melbourne warehouse at no added cost.

Bookings are essential. Collection available at U5/25 Jersey Rd, Bayswater, Vic 3153.

Once your order has been placed, we will contact to let you know when your order will be available for pickup. (Our operating hours are between 8AM to 5PM Monday to Friday and 9am-3pm on Saturday).