500 amps. 100% duty cycle. Five welding processes.
Meet the BT Weld FAB 500HD Air: a heavy-duty industrial MIG welder built for demanding Australian fabrication workshops.
Heavy fabrication does not leave much room for waiting. Across Australian structural steel, mining repair, agricultural equipment and trailer manufacturing, long runs and repeat production call for a welding system that can keep pace with the workshop.
The BT Weld FAB 500HD industrial welder combines 500A output with a published 100% duty cycle at 40°C, a separate four-roll wire feeder and five welding processes. Available through BT Weld resellers across Australia, the air-cooled package is designed for professional workshops working across structural steel, heavy equipment, trailers and other demanding fabrication jobs.
At a glance: The FAB 500HD Air is a three-phase 415V industrial welding package supporting synergic and manual MIG, gas and gasless MIG, DC scratch-start TIG, MMA and gouging. It includes a separate four-roll wire feeder, trolley, toolbox, torch, regulator and leads.
Watch the BT Weld FAB 500HD in action
A 500A industrial MIG welder for demanding production
The headline figure is not just the maximum amperage. BT Weld publishes a 100% duty cycle at 500A, measured at 40°C over a ten-minute period. At the rated condition, that represents the full ten minutes of the duty-cycle test period available for welding.
For a production workshop, this rating matters when jobs involve repeated welds or long runs at high current. It helps the operator assess the machine against the real rhythm of the work, not only a peak-output figure.
Important: Duty cycle is a standardised equipment rating. Actual operation still depends on ambient conditions, setup, maintenance, process, consumables and the complete system. Follow the machine instructions and site requirements.
Why the FAB 500HD suits Australian fabrication workshops
Australian fabrication businesses often need one system to cover production welding, repair work and changing materials. The FAB 500HD is designed around that mixed workload, with the output for heavy plate and the process choice to move between fabrication and maintenance tasks.
Its combination of sustained output, a mobile separate wire feeder and gouging capability makes it worth considering for structural steel fabrication, mining and earthmoving equipment repair, pressure-vessel work, agricultural machinery and trailer manufacturing. The right configuration still depends on the weld procedure, site conditions and production demands.
Five processes from one industrial platform
The FAB 500HD gives a workshop several ways to approach a job:
- Synergic and manual MIG: choose assisted setup or direct parameter control.
- Gas and gasless MIG: configure the machine for the selected wire and working conditions.
- DC TIG: scratch-start operation for suitable repair and fabrication tasks.
- MMA stick: electrode capability from 1.6 to 5mm.
- Gouging: remove defective metal or prepare an area for repair with the optional K4 arc-air gouging torch and appropriate setup.
This process range can be useful when the workload moves from production MIG to repair work and weld removal. The machine is also listed for mild steel, stainless steel, brass and copper, with aluminium capability in MIG mode when correctly equipped.
A separate wire feeder for practical workshop access
The FAB Feed four-roll wire feeder is separate from the power source. This lets the operator position the feeder closer to the work while the power source remains on its trolley. The standard package includes a 2m interconnection cable, with 5m, 10m and 15m options listed as upgrades.
The drive system accepts wire from 0.6 to 2.4mm and suits D200 and D300 spools. Matching the drive rollers, liner, contact tip and torch to the wire is essential, particularly when changing material or diameter.
Built for heavy fabrication and plate up to 30mm
BT Weld publishes a maximum plate thickness of 30mm for the FAB 500HD. Plate capacity is not a one-setting guarantee: material, joint design, preparation, welding position, process and number of passes all affect suitability. Take representative job details to a demonstration and assess the complete procedure.
The machine also offers 2T, 4T, S4T and spot-weld modes, weld-parameter storage and a voltage reduction device. A 32A three-phase plug is fitted to the 3m primary lead, while the trolley and toolbox provide a practical base for organising the system.
BT Weld FAB 500HD Air specifications
| Specification | Published detail |
|---|---|
| Model / part number | FAB 500HD Air / 659500 |
| Input power | Three-phase 415V, 50-60Hz, ±15% |
| Duty cycle | 100% at 500A, measured at 40°C over 10 minutes |
| Welding current | MIG 30-500A; TIG 10-500A; MMA 10-500A |
| Processes | Synergic/manual MIG; gas/gasless MIG; DC scratch-start TIG; MMA; gouging |
| Wire / electrode range | Wire 0.6-2.4mm; electrodes 1.6-5mm |
| Published plate capacity | Up to 30mm, application dependent |
| Protection / insulation class | IP21S / S |
| Dimensions / weight | H138 × L95 × W59cm / 153kg |
| Warranty | Five-year limited warranty |
What comes in the air-cooled package?
The standard package includes the 415V FAB 500 power source, trolley, separate FAB Feed four-roll wire feeder, toolbox, 2m interconnection cable, 3m BZ36 HD MIG torch, 3m primary lead with fitted 32A three-phase plug, 4m earth lead with heavy-duty brass G clamp, fitted and spare drive rollers, torch hanger, argon twin-gauge regulator, and warranty/manual card.
Available upgrades include longer interconnection cables, longer MIG torches, an SPX36 spool gun, a K4 arc-air gouging torch, water cooler and BZ501 water-cooled MIG torches. Confirm the correct configuration and included accessories with your reseller before ordering.
Frequently asked questions
Is the FAB 500HD single phase?
No. The FAB 500HD Air requires three-phase 415V power and is supplied with a 32A three-phase plug fitted. Have the electrical supply assessed by a qualified person against the machine requirements and intended load.
Can the FAB 500HD weld aluminium?
Aluminium is listed for MIG welding only. Use the appropriate wire, drive setup, torch or optional spool gun, shielding gas and procedure for the alloy and application.
Does it include a separate wire feeder?
Yes. The air-cooled package includes the FAB Feed four-roll wire feeder and a 2m interconnection cable. Longer interconnection cables are available separately.
Can it be converted to a water-cooled setup?
A 7L water cooler, coolant and BZ501 water-cooled MIG torches are listed as upgrade options. BT Weld also offers a dedicated water-cooled package. Ask a reseller which configuration suits the intended current and welding duration.
How can I assess it for my workshop?
Book a demonstration and provide details of the material, joint, wire, gas and production cycle you expect to use. Testing a representative job gives you a more useful basis for choosing the system.
Where can I buy the FAB 500HD in Australia?
Use the BT Weld reseller locator to find a welding supplier near you in Australia. You can also request a demonstration before deciding which air-cooled or water-cooled package suits your workshop.
Put the workshop workhorse to the test
If your Australian workshop needs high output, sustained production and the flexibility to move across several welding processes, see how the BT Weld FAB 500HD fits your operation. Review the specifications, discuss the complete package and arrange a demonstration using your application requirements.
View the air-cooled package or find a BT Weld reseller.
Compare more BT Weld welding machines for Australian fabrication, workshop and site applications.
Published ratings and package details are supplied by BT Weld / Dynaweld. View the FAB 500HD Air specification sheet. Product suitability depends on the complete application and setup.
