How to find the right Aluminum I-Beams AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in Aluminum I-Beams

Alloy and temper: 6061-T6 for load-bearing beams; 6063-T5/T52 only for architectural or light trim use 6061-T6 has much higher yield strength. 6063 is chosen for surface finish, not for carrying load.
Beam standard: Confirm whether it is an Aluminum Association (AA) standard I-beam or an American Standard (S-shape) profile before matching to drawings Two beams with the same nominal depth can have different flange widths, web thicknesses and section properties.
Section dimensions and weight per foot: Check depth, flange width, web thickness, flange thickness and weight per foot against your calculation, not just the nominal depth Stiffness and strength depend on the full cross-section. Nominal depth alone does not fix them.
Deflection versus steel: Aluminum's elastic modulus is about one-third of steel's. A same-size swap deflects roughly three times as much under the same load Undersized aluminum beams usually fail by sagging or bouncing before they fail in strength.
Welding plan: Design for reduced strength in the heat-affected zone if the beam will be welded. Prefer bolted connections where possible Welding 6061-T6 removes much of the temper's strength near the weld.
Cut length and tolerances: Order cut-to-length with stated length tolerance. Check straightness and twist on long pieces Extrusions can bow or twist, and stock lengths may need trimming to fit your span.

Kaiser Aluminum: Major North American producer of structural extrusions and shapes.
Hydro: Large global extruder, also supplying structural profiles.
Bonnell Aluminum: US extruder of standard and custom aluminum shapes.
Arconic: Former Alcoa products business, producing extrusions and structural products.

Listings that do not state the alloy, temper and full cross-section dimensions
Using 6063 or unspecified-alloy beams for structural spans
Swapping in an aluminum beam at the same size as a steel beam without checking deflection
Bolting directly to carbon steel in wet or outdoor settings without isolation or stainless fasteners, because of galvanic corrosion

Not at the same size. It is lighter and corrosion-resistant, but much less stiff, so it usually needs a deeper section to match steel's deflection.

I-beams have narrower, often tapered flanges. Wide-flange shapes have wider flanges and resist sideways buckling better on long unbraced spans.