Aluminium Welding Services VIC 2026 - Get Quotes

TIG, MIG and Spool Guns

Nearly all aluminium welding in Victorian workshops uses one of two processes. TIG welding, short for tungsten inert gas, strikes the arc from a tungsten electrode that does not melt, while the welder adds filler rod by hand, and on aluminium it runs on alternating current so the oxide film is cleaned away as the weld moves. That fine control over heat suits thin sheet, cast parts and visible welds on gates and balustrades where the finish matters. The trade off is speed, because TIG is slow and is usually priced by the hour. For small, careful repairs it remains the default choice.

MIG welding, short for metal inert gas, feeds a continuous wire through the gun and covers long runs and thicker plate far faster than TIG. Soft aluminium wire tangles easily when it is pushed through a long gun cable, so welders use a spool gun that carries a small reel at the handle, or a push pull system that drives the wire from both ends. Most tray, trailer and plate boat work in Melbourne's fabrication shops is done this way, often on production style machines that also handle steel with a quick change of wire and gas. Pulsed MIG machines, which switch rapidly between high and low current, give better control again on thinner sections and leave a neater bead.

Alloys, Filler Wire and Heat Affected Zones

Aluminium is sold as dozens of alloys, each identified by a four digit number, and they do not weld the same way. The 5000 series, including 5052 and 5083, contains magnesium and handles salt water well, which is why it is the standard for plate boats, pontoons and marine fittings on Port Phillip and Western Port. The 6000 series, including 6061 and 6063, is used for extrusions such as tube, angle, fence rails, window frames and ute tray sections. Cast alloys used in engine parts and outboard housings behave differently again. Filler wire has to suit the parent metal, and the two most common are 4043, which flows well and resists cracking on many 6000 series jobs, and 5356, which is stronger, suits marine alloys and keeps its colour if the part is later anodised. A welder who asks what the item is and where it lives before starting is choosing the right filler.

Heat treated alloys lose some strength in the band of metal beside a weld, which matters for anything carrying load. Most owners never see it, because the weakened metal looks exactly like the rest of the part. Material such as 6061 in the T6 temper gets much of its strength from heat treatment, and welding heat softens a band of metal on either side of the joint called the heat affected zone. That band can end up considerably weaker than the rest of the part. It rarely matters on a fence rail, but on a trailer drawbar, crane mount or pontoon frame the design has to allow for it, which is why load bearing aluminium structures are designed and welded to AS/NZS 1665, the standard for welded aluminium structures.

Boats, Pontoons and Houseboats

Victoria has a very large fleet of aluminium boats, from tinnies on the Gippsland Lakes and the Murray to plate boats that cross the Rip at Port Phillip Heads or the Lakes Entrance bar in search of snapper and tuna. They crack for predictable reasons, including pounding in short, steep seas, heavy outboards flexing the transom and trailer rollers that load the hull on a few hard points. A good marine welder looks for the cause first, drills a small stop hole at each end of the crack, grinds out the damaged metal and welds it back with a suitable filler. Where flexing caused the crack, an internal doubler or extra rib is often added to spread the load. Checking the trailer at the same visit makes sense, because many hull cracks start there.

Riveted tinnies need a lighter touch than welded plate boats. Their hull sheet is thin, and welding near rivet lines can buckle the panel and loosen rivets nearby, so weeping rivets are usually replaced or resealed rather than welded over. Plate boats, on the other hand, are built by welding, and repairs to hulls, transoms, rod holders and bait boards are routine for a marine specialist. Pontoons deserve special mention in Victoria, where aluminium houseboat and jetty pontoons on Lake Eildon, Lake Hume and the Murray are repaired on site or on a slipway. That work depends on water levels, access and flotation, and it is usually quoted by the hour after an inspection. Owners should expect the welder to want the pontoon emptied of water and dried before any chamber is opened.

Two cautions apply to every vessel. Underfloor fuel tanks and anything that has held fuel must never be welded until properly drained and gas freed, which means purged of flammable vapour, because what is left inside an aluminium tank can explode when heated, and this is specialist work. Commercial vessels such as charter and fishing boats sit under the national system run by the Australian Maritime Safety Authority, and structural repairs to a vessel in survey generally need the surveyor involved before and after. Recreational boats are the owner's responsibility, so choosing an experienced marine welder matters more than any paperwork.

Ute Trays, Canopies and Trailers

Aluminium ute trays and canopies are standard kit on Victorian farms, trade vehicles and touring rigs, and they take a pounding on gravel roads through the Mallee, Gippsland and the High Country. Typical repairs include cracked headboards and tray corners, broken dropside hinges, split toolbox seams and cracked brackets where the tray bolts to the chassis. Most are straightforward MIG or TIG jobs costing a few hundred dollars. Cracks that keep returning in the same place point to overloading, a missing brace or a tray mounted too rigidly on a flexing chassis, and fixing that cause stops the cycle. Weighing the loaded vehicle at a public weighbridge before paying for the same repair twice is a simple and useful check. Many transfer stations and grain receival sites across regional Victoria have weighbridges open to the public.

Trailers need more caution, as a drawbar, coupling mount or axle attachment carries the full towing and braking load and takes a shock at every pothole, and a poorly designed weld on heat treated extrusion can leave it weaker than before. Trailers built or modified for road use must meet national vehicle standards, and couplings and towing components are covered by AS 4177. Significant structural changes to a registered trailer may need certification, and Victoria has its own scheme for assessing modified vehicles, so check the requirements before altering anything beyond a like for like repair. Heavier steel chassis and trailer frames are everyday work for a general welding workshop, which is often just down the road from the aluminium specialists in industrial areas such as Dandenong South and Campbellfield.

Cast Aluminium Repairs

Cast aluminium turns up in outboard motor legs and housings, engine blocks and cylinder heads, gearbox cases, pump bodies, mower decks and older decorative fittings. Castings are harder to weld than sheet or plate as the metal is often porous and has usually soaked in oil, fuel or salt water for years. Cast alloys can also crack as they cool if the heat is not controlled. A careful repair involves degreasing, sometimes baking the part in an oven to drive out oil, preheating, slow AC TIG welding and then machining or grinding back to shape.

Results vary more than with other aluminium work, and a good welder will say so upfront. A broken mounting ear on a gearbox case or a cracked fin on an outboard leg is often a very good repair. A cracked cylinder head or a housing that must stay oil tight under pressure is harder, and replacement may make more sense if a part can be bought at a reasonable price. Many shops quote cast work as an hourly rate with a cap, given that nobody knows what the metal is like until the crack has been ground out. Ask before work starts whether the repair is expected to hold pressure and what happens if the metal will not take a clean weld.

Pool Fences, Gates and Balustrades

Aluminium pool fencing, slat fences, gates, balustrades and handrails are common across Melbourne's suburbs and coastal towns as they do not rust and need little maintenance. Typical repairs include broken welds at rail joints, gates that have dropped after a hinge post cracked, bent balusters and damage from cars, mowers or storms. A portable machine handles most of these on site, and a simple gate repair with easy access is often finished within an hour. Larger panels with several failed joints are usually lifted off and repaired in the workshop instead.

Pool barriers carry legal duties in Victoria. Owners of pools and spas must register them with their local council and obtain a certificate of barrier compliance from a registered building surveyor or inspector, then renew it every four years, and the barrier must meet the standard that applied when the pool was built, typically based on AS 1926.1. Councils can issue notices and fines where a barrier is found to be non compliant, so repairs are worth getting right the first time. A welded repair that changes a gap, creates a foothold or stops a gate self closing can turn a compliant barrier into a failed one. Compliance checks and repairs to existing barriers are the daily work of pool fence repairs and compliance businesses, and new barriers come from pool fencing installation companies.

Balustrades and handrails are safety barriers too, and the National Construction Code sets their height, openings and strength. A cracked weld at the base of a post is not cosmetic, since that is where the load goes when someone leans on the rail. Where the post fixing into a deck or slab has failed, the welding may be the easy part of the job. Damaged barriers on decks and balconies are assessed by balustrade and handrail repair specialists, and complete replacement systems are supplied by balustrade installation companies.

Powder Coat, Anodising and the Finish Afterwards

Welding destroys the finish around the joint, so the finish needs planning before the weld. Powder coat burns and blisters for several centimetres either side of the repair and has to be ground back first anyway. A small repair can be touched up with matching paint, which protects the metal and looks acceptable from a few metres away. For a gate or balustrade at the front of the house, stripping and recoating the whole panel gives a far better match and a longer life. Many welders arrange this through a local powder coater and include it in the quote.

Anodised aluminium is harder, given that anodising is an electrochemical finish that becomes part of the metal surface and cannot be touched up like paint. A welded repair on an anodised window frame or fitting leaves a bright or discoloured patch that stays visible, and re anodising means stripping the whole part and sending it away. For many anodised items, such as window sections and small fittings, replacement is simpler and costs less. Along the bay and the Surf Coast, a coastal grade powder coat and regular rinsing make a noticeable difference to how long any repair looks right. Driveway gates whose motors, sensors and hinges are affected by a repair usually need realigning afterwards, and automatic gate installers can recommission them.

Mobile Welding or the Workshop

Aluminium welds best indoors, since the argon gas that shields the weld pool is easily blown away by even a light breeze across an open driveway. A workshop also has the cleaning gear, preheating equipment and jigs that produce better results, and it avoids a call out fee. Where the item can travel, taking it in is usually the cheaper and better option. Fixed gates, balustrades, pool fences, boats on trailers and houseboat pontoons still need someone to come to them. Mobile welders set up windbreaks, run a generator where needed and plan around Melbourne's changeable weather, and a good one will reschedule if the wind picks up rather than weld in poor conditions.

Fumes, Fire Danger and Safety Around the Job

Welding fumes are classified as causing cancer by the International Agency for Research on Cancer, and aluminium welding also produces intense ultraviolet light and ozone. A welder working at your home should use fume extraction or ventilation and set up screens to protect people nearby. Keep children, pets and neighbours well back from the arc, as its light can burn eyes and skin at a distance. Businesses can find guidance on welding hazards and controls from WorkSafe Victoria.

Fire is the seasonal risk across much of the state. During the declared fire danger period in country Victoria, and especially on total fire ban days, hot work such as welding, cutting and grinding in the open is tightly restricted and may only proceed under strict conditions, if at all. Rules differ between the metropolitan area and CFA country, so check the current fire danger rating and restrictions before booking outdoor work in summer, particularly on rural blocks and in bushland fringe suburbs. The Country Fire Authority publishes current restrictions and safety guidance at CFA. Apartment buildings, marinas and commercial sites often require a hot work permit as well, and arranging it before the welder arrives avoids a wasted call out.

Regional Considerations Across Victoria

Melbourne's aluminium specialists cluster in industrial areas such as Dandenong South, Braeside, Campbellfield, Bayswater and Laverton North, with marine specialists near the bay around Mordialloc, Hastings and Williamstown. Rates in Melbourne sit toward the upper end of the ranges on this page. Travel across the city adds to mobile work, so a welder close to the job often quotes more competitively. Geelong and the Bellarine have a strong base of marine and trailer work serving Corio Bay and Port Phillip.

Gippsland combines boats on the Gippsland Lakes and the Lakes Entrance bar with farm ute trays and equipment inland. The north east and the Murray, from Lake Hume to Echuca, bring houseboat pontoons, trailer boats and river fittings. Farming regions in the Wimmera, the Mallee and the Western District have fewer aluminium specialists, so owners often take items to Bendigo, Ballarat, Horsham or Warrnambool, or combine several jobs into one visit. Regional welders in these areas often travel on set days each week, which can lower the travel component of a mobile quote. Shade structures with aluminium posts along the coast also need salt aware repairs, and shade sails and awnings specialists handle the fabric and fittings.

What Aluminium Welding Costs in Victoria

Workshop rates for aluminium welding in Victoria typically run $90 to $145 an hour, and many shops set a minimum charge of around an hour for small jobs. A mobile welder usually adds a call out fee of $110 to $240. Small cracks, broken tabs and brackets generally cost $90 to $280 to repair. Gate, fence and balustrade repairs run $150 to $580, depending on access and whether refinishing is included. Melbourne jobs generally sit toward the top of each range, while regional workshops are often slightly lower.

Larger jobs vary more widely, with ute tray and trailer repairs usually landing between $200 and $1,150 and cast aluminium repairs between $150 and $650. Boat hull cracks and pontoon repairs commonly cost $300 to $1,700, and major transom or pontoon work costs more. Custom toolboxes, racks and frames run $600 to $3,400. Powder coating after welding and gas freeing a fuel tank are often extra. Standard steel gates and fences around the same property may be cheaper through handyman fence and gate repair services when no aluminium welding is involved.

What to Look Out For

Choose a welder who works with aluminium regularly and can show photos of similar jobs. Reviews that mention the same kind of item, such as boats or pool fences, are more useful than general praise. Ask which process and filler wire they will use and how the metal will be prepared before welding. Be wary of anyone who welds over paint, salt or grease, or who offers a quick fix on a trailer drawbar or boat transom without looking for the cause. Good aluminium welders are happy to talk through the method, the filler and the finish before they pick up the torch.

Get the price for refinishing in writing, given that a cheap weld on a powder coated gate can become an expensive job once the coating is added. Never allow welding near a fuel tank that has not been gas freed, and make sure any repaired pool barrier still passes its compliance requirements. Consumer rights on repairs and fabrication are explained by Consumer Affairs Victoria. Disputes that cannot be settled directly with the business can be taken to VCAT.

How to Get Useful Quotes

Describe the item and how it is used, whether a plate boat that crosses the Rip, a houseboat pontoon, a ute tray on a farm vehicle or a pool gate. Clear daylight photos of the damage from a few angles, and one of the whole item, help the welder judge the job. Mention the size of the crack or break and whether the item can be brought to a workshop. Include the make, model and age where relevant, along with whether the item is powder coated or anodised.

Mention any previous repairs to the item, since old welds and patches change the approach. For boats, say whether a fuel tank sits near the damage and whether the vessel is used commercially. Ask each welder to state the process, filler, preparation, refinishing and warranty in writing. Aluminium framed screens and doors are normally proprietary products, so security doors and screens suppliers usually replace the damaged part instead of welding it.