Question 1

What diameters are available for aluminium round tubes?

Accepted Answer

Professional aluminium round tubes for event technology are typically available in diameters ranging from 35 mm to 60 mm, matching the chord dimensions of standard truss systems. The most common sizes include 35 mm diameter (used in Naxpro-Truss FD21-24 series), 50 mm diameter (FD31-44 and HD31-44 series), and 60 mm diameter (GS94 heavy-duty truss). Wall thicknesses range from 2 mm to 5 mm depending on load requirements. Custom diameters outside this range may be available for special applications, though they typically require longer lead times and minimum order quantities. When selecting diameter, consider compatibility with Your existing truss system and the load capacity requirements of Your specific application.

Question 2

What is the difference between anodised and powder-coated finishes?

Accepted Answer

Anodised finishes are created through electrochemical treatment that thickens the natural oxide layer on aluminium, providing enhanced corrosion resistance and surface hardness whilst maintaining the metallic appearance. The standard E6/EV1 silver anodised finish offers a neutral, professional look that blends with most truss systems. Powder coating, by contrast, applies a coloured polymer layer that can match any RAL colour specification, providing superior impact resistance and UV stability. Powder coating is thicker (40–80 microns versus 10–25 microns for anodising) and offers better scratch resistance, making it ideal for equipment that travels frequently. Anodised finishes are generally preferred when maintaining precise dimensional tolerances is critical, whilst powder coating excels when specific colour matching or maximum durability is required. Both treatments significantly outperform raw aluminium in terms of longevity and ease of maintenance.

Question 3

Can aluminium round tubes be cut to custom lengths?

Accepted Answer

Yes, aluminium round tubes can be cut to custom lengths using appropriate metal-cutting tools. Professional suppliers typically offer cutting services with tolerances of ±1 mm, ensuring square, clean cuts suitable for immediate installation. Maximum shipping lengths are usually 3 metres for standard delivery services, though longer tubes up to 6 metres can often be arranged for collection or specialist freight. Minimum cut lengths are typically 15 mm, though practical applications rarely require pieces shorter than 100 mm. When ordering custom lengths, consider that cutting processes may leave burrs that require deburring before assembly, particularly if tubes will be inserted into conical connectors or other precision hardware. For field modifications, use metal-cutting band saws or chop saws with carbide-tipped blades to maintain dimensional accuracy and avoid deforming the tube profile.

Question 4

What wall thicknesses are standard for 50 mm diameter tubes?

Accepted Answer

Standard wall thicknesses for 50 mm diameter aluminium round tubes in event technology applications are 2 mm and 3 mm, corresponding to the specifications used in professional truss systems. The 2 mm wall thickness (as used in Naxpro-Truss FD31-44) provides a good balance of weight and strength for moderate load applications, weighing approximately 0.9 kg per metre. The 3 mm wall thickness (HD31-44 specification) offers increased load capacity for heavy-duty rigging applications, weighing roughly 1.2 kg per metre. Less common are 1.5 mm walls for lightweight decorative applications and 4–5 mm walls for extreme load scenarios. When selecting wall thickness, consider the span length, load distribution, and safety factors required by DGUV Vorschrift 17. Thicker walls provide higher load capacity but add weight and cost, so match the specification to Your actual requirements rather than automatically choosing the heaviest option.

Question 5

Are aluminium round tubes suitable for outdoor use?

Accepted Answer

Yes, aluminium round tubes are highly suitable for outdoor use due to the metal's natural corrosion resistance. Aluminium forms a protective oxide layer when exposed to air, preventing further oxidation and rust formation – unlike steel, which requires protective coatings to survive outdoor conditions. For extended outdoor exposure or harsh environments (coastal areas with salt spray, industrial zones with chemical pollutants), anodised or powder-coated finishes provide additional protection and maintain aesthetic appearance over time. Raw aluminium may develop a chalky white patina outdoors, which is harmless but can be unsightly; anodising prevents this discolouration. Aluminium round tubes maintain their structural properties across a wide temperature range, from -40°C to +150°C, making them suitable for outdoor events in all seasons. However, always ensure that connection hardware and mounting systems are also rated for outdoor use, as galvanic corrosion can occur when dissimilar metals are in contact in wet conditions.

Question 6

How do I calculate the load capacity of an aluminium round tube?

Accepted Answer

Calculating the load capacity of aluminium round tubes requires considering multiple factors: tube diameter, wall thickness, span length, material properties (tensile strength, elastic modulus), loading configuration (distributed versus point loads), and support conditions (simply supported, fixed ends, cantilever). For professional event technology applications subject to DGUV Vorschrift 17, calculations must include a safety factor of at least 5:1 and should be performed by a qualified structural engineer. As a rough guideline, a 50 mm × 3 mm tube spanning 2 metres with simply supported ends can typically handle distributed loads of 150–200 kg, but this is not a substitute for proper engineering analysis. Online calculators and beam tables can provide preliminary estimates, but certified load ratings for rigging applications require documented calculations that account for dynamic loads, fatigue considerations, and connection efficiency. When in doubt, consult with the tube manufacturer or a structural engineer familiar with event technology standards.

Question 7

What is the difference between EN AW-6060 and EN AW-6063 aluminium alloys?

Accepted Answer

EN AW-6060 and EN AW-6063 are both aluminium-magnesium-silicon alloys commonly used for extruded profiles, including round tubes for event technology. EN AW-6060 (also designated AlMgSi0.5) contains slightly lower alloying elements and is the standard choice for structural applications in Europe, offering good strength (minimum 215 N/mm² tensile strength in T66 temper), excellent corrosion resistance, and very good weldability. EN AW-6063 (AlMg0.7Si) has marginally higher strength and is more common in North American specifications, though the practical differences in event technology applications are minimal. Both alloys are highly suitable for anodising and powder coating, maintain structural properties across typical operating temperatures, and meet the requirements of professional truss systems. When selecting between them, compatibility with existing certified components is more important than the minor material differences. Most European truss manufacturers, including Naxpro-Truss, specify EN AW-6060 as the standard material.

Question 8

Can aluminium round tubes be welded to truss components?

Accepted Answer

Yes, aluminium round tubes can be welded to truss components using TIG (tungsten inert gas) or MIG (metal inert gas) welding processes with appropriate filler materials. EN AW-6060 and 6063 alloys offer good weldability, though the heat-affected zone adjacent to the weld will experience some strength reduction due to the loss of heat treatment. For load-bearing joints subject to DGUV Vorschrift 17 requirements, post-weld heat treatment (solution treatment followed by artificial ageing) may be necessary to restore full T66 temper properties. All welded connections in rigging applications must be designed and certified by a qualified structural engineer, with documentation demonstrating compliance with EN 1090 and relevant safety standards. Welding should be performed by certified welders experienced with aluminium, as the material's high thermal conductivity and oxide layer require specific techniques. Non-structural decorative welding is less critical but still benefits from proper technique to achieve clean, attractive joints. Always verify that welding will not void warranties or safety certifications before proceeding.

Aluminium tubes round