Used Weldmax 600BT-2 Multi-Process Inverter Welder with Separate Wire Feeder (Black Thunder)

The used Weldmax 600BT-2 “Black Thunder” is a 600-amp, three-phase IGBT multi-process inverter welder. It comes with a separate heavy-duty wire feeder and a power source trolley. It’s built for structural steel, heavy-section fabrication and long production runs. It welds gas-shielded MIG and gasless flux-cored wire [and MMA stick, confirm], with stepless voltage and wire-speed control. It’s ready to weld out of the box: the 32A three-phase plug comes fitted to a 10 m primary lead, and the package includes a 12 m interconnecting cable, a 4 m Euro-connection MIG torch, a 10 m heavy-duty earth lead and an argon regulator. Every unit has been fully inspected and tested by the QWS workshop before sale, and it costs well under the price of a new 600A package.

A 600A industrial multi-process welder without the new-machine price

A 600-amp power source suits fabricators doing heavy plate, structural and repair work who need to run large-diameter wire hot, for long periods. Because it’s a multi-process machine, one power source can cover several welding processes on the same job. Buying used from a specialist distributor gets you that capacity for less, without the risk of a private sale. Every 600BT-2 sold by QWS has been checked for output stability, wire feed performance and reliability by our own workshop. Expect some cosmetic wear. The machine underneath is in very good working order.

Weldmax is the QWS house brand. Lifetime product support and parts back-up come straight from the team who sold you the machine.

Key features

• 600A IGBT multi-process inverter. High output for heavy-section steel and structural welding. It handles MIG, flux-core MMA stick, gouging, DC TIG from one power source.
• Separate heavy-duty wire feeder. The 4-roll drive gives a steady, consistent feed at high amperage and with larger wire.
• 12 m interconnecting cable. Leave the power source where it is and take the feeder to the work.
• Power source trolley included. Move the machine easily around the workshop or yard.
• Euro torch connection. Fits the industry-standard Euro connector, so replacement torches and consumables are easy to find.
• 10 m primary lead with fitted 32A three-phase plug. Plug it in and weld, with reach to outlets away from the job.
• Stepless voltage and wire-speed adjustment. Fine-tune the arc for each joint, plate thickness and position.
• 2T/4T trigger modes. Use 4T latch mode on long runs to cut down on trigger-finger fatigue.
• Thermal overload protection and heavy-duty cooling. Made for hot, dusty Australian workshops and long shifts.
• Generator-compatible. Can run from a suitably sized generator for remote work.
• Fully workshop-tested. Inspected and test-welded by QWS before dispatch.

Ideal applications

• Structural steel and heavy fabrication
• Production and workshop MIG welding
• Heavy machinery, mining and earthmoving equipment repair
• Long-run industrial welding with large-diameter solid or flux-cored wire
• Site and maintenance work where one machine needs to do more than one process

What’s included

• Weldmax 600BT-2 multi-process inverter power source (used, very good condition)
• Power source trolley
• Separate heavy-duty 4-roll wire feeder
• 12 m interconnecting cable
• 4 m MIG torch with Euro connection
• 10 m earth lead with heavy-duty G-clamp
• Argon gas regulator with hose
• 10 m primary lead with 32A three-phase plug fitted
• Drive rolls for steel and stainless steel
• Owner’s manual 
• 3 month warranty

Technical specifications

Frequently asked questions

Is a used 600A MIG welder worth buying?
It can be, if you buy from a supplier who tests and backs the machine. This Weldmax 600BT-2 has been inspected and test-welded by the QWS workshop, comes as a complete ready-to-weld package with a trolley, and includes a 3 month warranty. You get industrial 600A capacity for much less than a new machine of the same size.

What does “multi-process” mean on the Weldmax 600BT-2?
It means one power source can run more than one welding process. The 600BT-2 handles gas-shielded MIG and gasless flux-core through the wire feeder and MMA stick welding direct from the power source, as well as gouging. You don’t need a second machine for those jobs.

What power supply does the Weldmax 600BT-2 need?
It runs on 400V three-phase power. It comes with a 10 m primary lead and a 32A three-phase plug already fitted. Have a licensed electrician confirm your outlet and circuit breaker suit the machine before connecting.

What torch connection does it use?
The included 4 m MIG torch uses a standard Euro connection, so replacement torches, liners and consumables are widely available.

Can the Weldmax 600BT-2 weld gasless flux-core wire?
Yes. It handles gas-shielded MIG with solid wire and gasless flux-cored wire, so it suits both workshop and outdoor site work.

What’s the advantage of a separate wire feeder?
With a separate wire feeder, the heavy power source stays on its trolley while you take the lighter feeder to the job. The 12 m interconnecting cable gives you plenty of reach around large fabrications, and the 4-roll drive feeds larger wire more reliably than a 2-roll system.

Can I run the Weldmax 600BT-2 from a generator?
Yes, it’s designed to be generator safe.

What thickness steel can a 600A MIG weld?
A 600A MIG is built for heavy-section steel, structural members and thick plate, often with multi-pass welds. The actual single-pass penetration depends on the wire, the gas, the joint preparation and the welding position. Talk to QWS about your application.

Does it come ready to weld?
Yes. The package includes the trolley, torch, earth lead, argon regulator, and a 10 m primary lead with the 32A plug fitted. Add wire and shielding gas and you’re ready to go.

Can I finance a used welder through QWS?
Yes. QWS offers equipment finance, including lease-to-own options. Contact the sales team to discuss.