Humpty Doo Welding and Fabrication
Territory Proud · Est. 2003

Precision Welding & Fabrication

Industrial welding, fabrication and general engineering for Australia's toughest industries. We service tier one contractors across mining, marine and transport — Australia-wide.

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20+
Years in the trade
Australia-wide
Service coverage
Tier 1
Contractor clients
On-site
Mobile breakdown support

What we do

Built for the demands of heavy industry

Humpty Doo Welding and Fabrication specialises in industrial welding, custom fabrication and comprehensive general engineering. Based in Darwin, Northern Territory, with capabilities spanning the whole top end and Australia-wide. We're the trusted partner for tier one contractors in mining, marine and construction — delivering high-quality, durable solutions tailored to each project.

Our clients

Trusted across mining, marine & civil

Allseas
Aspire
Auriga
Brady Marine Civil
Caporn Piling
Chc
Gapunda Civil Construction
Glencore
Hagstrom Drilling
Hb Group
Hy Tec
North Australian Pastoral
Pinata Farms
Qube Energy
Seaswift
Shell Energy
Sitzler
Smc Marine
Van Oord
Allseas
Aspire
Auriga
Brady Marine Civil
Caporn Piling
Chc
Gapunda Civil Construction
Glencore
Hagstrom Drilling
Hb Group
Hy Tec
North Australian Pastoral
Pinata Farms
Qube Energy
Seaswift
Shell Energy
Sitzler
Smc Marine
Van Oord

Capabilities

Key services

All services →
Mine processing plant conveyor maintenance

Mining

Mining Solutions

Heavy-duty welding and fabrication for mining infrastructure, plant maintenance and critical industrial applications.

Marine vessel hull welding repair

Marine

Marine Fabrication & Repair

Hull repairs, custom mounts, vessel modifications and marine structure fabrication in aluminium and steel.

Welder fabricating a steel frame in the workshop

Fabrication

Aluminium & Stainless

Precision aluminium and stainless steel fabrication for marine, food-grade and architectural applications.

Lathe turning a large steel shaft

Engineering

Machining & Engineering

In-house machining and general engineering for shafts, flanges, bushings and custom components.
Our work

Recent jobs across the Top End

From mine-site gantries to wharf-side refits — a look at what comes out of the workshop and the mobile fleet.

Marine pile welding aerial sparks
Marine
Offshore pier steel piles water gauge
Marine
Pipe welding offshore platform onsite
Marine
Marine construction steel pile driving crane
Marine
Crane lift steel beam marine waterfront
Marine
Marine pile welder confined cage waterfront
Marine
Mine processing plant conveyor maintenance
Mining
Mining water trucks site maintenance
Mining
Excavator bucket weld repair workshop
Mining
Confined space welding inside mine drum
Mining
Mobile welding truck mine site night
Mining
Cat dozer track repair mobile welding
Mining
Steel fabrication workshop box section
General Fab
Gas cutting pipe steel fabrication
General Fab
Structural steel frame fabrication outdoor
General Fab
Elevated steel platform welding crane lift
General Fab
Steel beam grinding fabrication onsite
General Fab
Hardox wear liner mining truck tray
General Fab
Radial drill press steel machining
Machining
Lathe turning threaded steel fitting
Machining
Drill press boring steel section
Machining
Batch machined steel threaded sockets
Machining
Bronze bushing precision machining
Machining
Cnc lathe bronze shaft turning
Machining
Lathe turning large steel shaft
Machining
Large bore pipe flange fabrication site
Pipe & Coded Welding
Pipe piling crane waterway construction
Pipe & Coded Welding
Coded pipe welding team trench
Pipe & Coded Welding
Large pipe welding setup remote site
Pipe & Coded Welding
Pipe flange weld fabrication yard
Pipe & Coded Welding
Coded pipe welding onsite mobile truck
Pipe & Coded Welding
Underground pipe join welding trench
Pipe & Coded Welding
Pipe welding waterfront canal site
Pipe & Coded Welding
Steel pipe install rock cutting hillside
Pipe & Coded Welding
Confined space tank welding blue arc
Offshore
Construction barge crane offshore welding
Offshore
Offshore platform crane structural welding
Offshore
Offshore support vessel marine operations
Offshore
Allseas fortitude pipelay vessel port
Offshore
Offshore vessel deck welding huisman crane
Offshore
Heavy equipment port maintenance welding
Offshore
Marine barge vessel port operations
Offshore
Workshop pipe elbow welding hydrapower
Workshop
Steel plate rolling machine workshop
Workshop
Press brake steel plate bending workshop
Workshop
Cnc plasma cutting table steel workshop
Workshop
Bandsaw cutting steel square tube
Workshop
Structural steel welding fabrication yard
Workshop
Boat hull steel plate repair boatyard
Marine Repair
Ship hull weld seam repair dry dock
Marine Repair
Boat hull underside panel weld repair
Marine Repair
Barge hull compartment cutting repair
Marine Repair
Vessel hull structure welding confined space
Marine Repair
Boat keel skeg weld repair trailer
Marine Repair
Boat hull side plating repair welding
Marine Repair
Steel barge hardstand excavator deck
Marine Repair
Ship deck steel grating fabrication
Marine Repair
Aluminium vessel bow repair boatyard
Marine Repair
Dredge vessel marine port operations
Marine Repair

Ready to start your project?

Ready to discuss your next industrial welding, fabrication or engineering project?

Contact Us Today