Ask for aluminium work and the answer you get depends entirely on which alloy is meant. The metal used for an intercooler end tank is not the same metal used for a fuel tank, and neither is the same as the sheet that gets rolled into a fan shroud. Aluminium alloys are grouped by how they gain their strength and by how they behave when they are welded, and those two facts decide most of what a fabricator can do with them.
The practical split is between alloys that are strengthened by alloying elements held in solution and then aged, and alloys that are strengthened only by working the metal. The first group can be quite strong in the right temper, but welding locally destroys that strength. The second group cannot reach the same strength, yet it forms beautifully and keeps more of its character around a weld.
For an intercooler, a catch can or a coolant tank the choice is rarely about maximum strength. It is about formability, weldability, corrosion behaviour and how the finished part will look and last. Those four considerations point to different alloys depending on whether the part is a pressure vessel, a ducted shell or a simple bracket.
6061 is the general-purpose structural choice. It machines well, it holds a shape, and it takes a finish cleanly, which makes it the natural pick for machined end tanks, flanges and fabricated brackets. Its limitation is that welding softens the metal next to the joint, so a part that relies on the parent metal strength right at a weld has to be designed with that in mind.
5052 is the forming alloy. It bends and rolls without cracking, it welds predictably, and it resists corrosion strongly enough for fuel tanks, water tanks, catch cans and ducting. Where a part is a shape rather than a load path, 5052 usually wins on both workability and finish.
3003 is the softer end of the range, used where a part is mostly a skin or a cover and the metal simply has to be flat, light and easy to work. It is not the alloy to specify for a tank that has to hold its shape under pressure, but it does an honest job where stiffness is not the point.
Welding aluminium puts a narrow band of metal through a heat cycle that alters it. In a heat-treated alloy that band loses much of its strength, and it cannot recover it without a full thermal treatment that would be impractical on a finished part. The part therefore ends up with soft zones running along every joint.
This is not a reason to avoid welding; it is a reason to design around it. Fabricators move load away from the joint, add thickness where a joint must carry something, or add a formed feature that stiffens the area. Where a part is a tank or a cover, the soft zone is harmless. Where it is a structural member, it has to be accounted for.
Aluminium also conducts heat away from the weld faster than steel does, so the arc has to work harder to establish a pool. Once the pool is there, it stays fluid and it moves quickly. That combination is why aluminium TIG work looks different from stainless work and why the travel speed and the gas coverage are set quite differently.
Tanks are where aluminium earns its place in an engine bay. A fabricated tank can be shaped around the space available, can carry internal baffles and fittings where they are actually needed, and can be built in a wall thickness matched to the duty. A moulded plastic tank has to be designed around a mould, and a cast one around a pattern.
Internals are the quiet benefit. A fuel tank can carry baffling that keeps fuel around the pickup under cornering. A water tank can carry separators or a defined return path. A catch can can be built with the inlet and outlet positioned so that the vapour has a chance to slow down and separate before it leaves. None of that is possible in a part that was chosen from a catalogue.
Aluminium has one practical caution in tank service. It is not the right metal for every fluid, and the joint and the finish matter as much as the alloy. A clean, well-shielded weld and a sensible surface finish are what keep a tank in service, and that is true whichever of the three alloys is used.
An intercooler is a mixture of processes. The core is a specialised assembly with its own internal structure, and the end tanks and mounting are fabricated around it. That is where aluminium selection matters most in our own range, which covers intercoolers for a long list of platforms and a set of custom builds where no standard shell exists.
End tank geometry is not decorative. The shape of the tank decides how the charge air spreads across the core, and a fabricated tank can be made to guide the flow rather than simply to cap the core. A machined fitting or flange in 6061 at the inlet, welded to a formed 5052 shell, is a normal and sensible combination.
Piping is the third element. Aluminium charge pipes and intake tubes are light and they shed heat quickly, but they flex under the same movement that the engine makes, which is why couplers and the mounting points carry real design weight. Where the pipe meets a silicone hose, the bead and the surface finish decide whether the joint stays put.
Aluminium protects itself with a thin oxide skin that re-forms almost immediately when it is scratched. In an engine bay that is generally enough. The exceptions are where aluminium sits against another metal in the presence of moisture, and where the surface has been left rough from a weld or a cut.
Finishing is where aluminium rewards attention. It can be left as mill finish, brushed to a consistent direction, or polished. A brushed finish is usually the more practical choice for a part that will be handled, because it hides small marks and it can be touched up locally without a visible patch. Polished work looks better in a show engine bay and asks more of the owner.
Where two different metals meet, an isolating gasket or washer is worth the trouble. That single detail prevents the small, slow corrosion that otherwise appears months into service around a mounting bolt.
Aluminium is chosen for three reasons: it is light, it conducts heat well, and it can be fabricated into shapes that no other process produces economically. Each of those brings a corresponding compromise. Light parts need more attention to mounting and vibration. Good conductivity means heat moves into the aluminium and then into whatever it touches. Free form means more fabrication steps, each with its own chance for error.
None of those compromises is severe when the part is designed for them. They become problems when an aluminium part is specified as a direct substitute for a steel or stainless one without any change to the design, because the physical behaviour of the two metals is not the same.
Aluminium work goes smoothly when a few decisions are made before anything is cut. These are the ones that change the drawing.
Those five answers give a fabricator enough to build to, and they avoid the rework that comes from discovering a requirement after the shell is welded.
Aluminium appears across the catalogue, from intake and charge parts to tanks and intercoolers. Our intercooler range includes both fabricated tanks and complete assemblies, and the same alloy thinking applies to the intake side, where titanium fab components show how a different metal is handled for the same duties. TIG work in aluminium and in the other materials is grouped under TIG titanium welding parts, and the material categories themselves are listed on the shop by material page.
If a project spans materials, the surrounding work is worth seeing too: titanium exhaust system and stainless steel exhaust system pages cover the hot side of the same vehicles. Since 2009 the shop has grown to roughly 53,819 sq ft with more than 50 employees, and aluminium parts for tanks, ducting and intercoolers are a steady part of that output.
