Aluminum Sheet Metal Fabrication: Lightweight, Corrosion-Resistant Parts
Aluminum sheet metal fabrication service offering 5052, 6061, and 7075 grades. Laser cutting, CNC bending with springback compensation, TIG welding, and anodizing. One-third the weight of steel with excellent corrosion resistance.
Aluminum Sheet Metal Fabrication: Lightweight, Corrosion-Resistant Parts
Aluminum sheet metal is one of the most versatile materials in manufacturing, prized for its lightweight (one-third the density of steel), corrosion resistance (natural Al₂O₃ oxide layer), excellent thermal conductivity (3× that of steel), and superior formability. These properties make aluminum the first choice for aerospace, automotive, electronics, and consumer product applications.
At FIRMFG, we fabricate aluminum sheets from 0.3mm to 6mm thick using fiber laser cutting, CNC press brake bending with material-specific springback compensation, TIG welding, and progressive die stamping. We stock three primary grades: 5052 (best formability), 6061 (best for welding and structural parts), and 7075 (highest strength).
This guide covers aluminum grade selection, material properties, fabrication processes, design guidelines, surface finishing, and cost factors. Or, skip ahead and request a quote for an immediate price and lead time.
Aluminum Quick Specifications
Key specifications for aluminum sheet metal fabrication across all three grades.
| Specification | Value |
|---|---|
| Material Thickness | 0.3 – 6 mm |
| Dimensional Tolerance | ±0.1 mm |
| Density | 2.68–2.81 g/cm³ (1/3 of steel) |
| Max Sheet Size | 1500 × 3000 mm |
| Bend Radius (5052) | 1× thickness |
| Bend Radius (6061) | 1.5× thickness (T6) |
Aluminum Grades for Sheet Metal
Three primary grades cover virtually all sheet metal applications. Grade selection depends on the required strength, formability, and weldability.
5052-H32
Best for Sheet Metal Forming
The most widely used aluminum alloy for sheet metal fabrication. Excellent formability, good corrosion resistance, and moderate strength. Non-heat-treatable strain-hardened alloy.
Properties: Tensile: 290 MPa | Elongation: 15% | Density: 2.68 g/cm³
Best for: Brackets, enclosures, panels, complex bends
Springback: 1.5–3°
6061-T6
Best for Structural & Welded Parts
Heat-treatable alloy with higher strength than 5052. Good weldability and corrosion resistance. Moderate formability — requires larger bend radii to prevent cracking.
Properties: Tensile: 310 MPa | Elongation: 12% | Density: 2.70 g/cm³
Best for: Structural frames, welded assemblies, heat sinks
Springback: 2–3.5°
7075-T6
Best for High-Strength Applications
Highest strength aluminum alloy, comparable to steel. Poor weldability and difficult to form — requires annealing before bending. Used for aerospace and high-stress applications.
Properties: Tensile: 570 MPa | Elongation: 7% | Density: 2.81 g/cm³
Best for: Aerospace parts, high-stress brackets, military components
Springback: 3–5°
Material Properties Comparison
Side-by-side comparison of 5052, 6061, and 7075 aluminum properties for material selection.
| Property | 5052-H32 | 6061-T6 | 7075-T6 | Note |
|---|---|---|---|---|
| Density | 2.68 g/cm³ | 2.70 g/cm³ | 2.81 g/cm³ | 1/3 of steel weight |
| Tensile Strength | 290 MPa | 310 MPa | 570 MPa | 7075 ≈ mild steel |
| Elongation | 15% | 12% | 7% | Higher = more formable |
| Thermal Conductivity | 138 W/m·K | 167 W/m·K | 130 W/m·K | 3× of steel |
| Corrosion Resistance | Excellent | Good | Moderate | Due to Al₂O₃ layer |
| Formability | Excellent | Moderate | Poor | 5052 is first choice |
| Weldability | Good | Good | Poor | TIG recommended |
5052 excels in formability and corrosion resistance. 6061 balances strength and weldability. 7075 prioritizes strength at the expense of formability and weldability.
Fabrication Processes for Aluminum
Aluminum is processed using the same equipment as steel, but with parameters adjusted for its high reflectivity, thermal conductivity, and softness.
Laser Cutting
Fiber laser cutting for clean edges, minimal HAZ, and tight tolerances. No burr or oxide layer on aluminum.
CNC Bending
Press brake bending with material-specific springback compensation. 5052 bends easily; 6061 requires larger radii.
TIG Welding
AC TIG welding with 4043/5356 filler. Clean, precise welds for structural joints and sealed enclosures.
Stamping
Progressive die stamping for high-volume aluminum parts. Ideal for connectors, terminals, and brackets.
Design Guidelines for Aluminum
Aluminum has different bending and welding characteristics than steel. Follow these DFM rules to prevent cracking, distortion, and dimensional issues.
| Feature | Recommended | Minimum |
|---|---|---|
| Min Bend Radius (5052-H32) | 1.0× thickness | 0.8× thickness |
| Min Bend Radius (6061-T6) | 1.5× thickness | 1.0× thickness (risk of cracking) |
| Min Bend Radius (7075-T6) | 3.0× thickness | 2.0× thickness (annealing recommended) |
| Hole-to-Bend Distance | 3× thickness + bend radius | 2× thickness + bend radius |
| Weld Heat-Affected Zone | Minimize HAZ with pulsed TIG; 6061 loses 40% strength near weld | Post-weld heat treatment for structural parts |
| Avoid Stress Concentration | Use large radii on corners and transitions | 0.5mm radius minimum on all corners |
| Anodizing Compensation | +0.025mm per side (Type II) | +0.05mm per side (Type III) |
| Max Part Dimensions | 1500 × 3000 mm | 2000 × 4000 mm (extended bed) |
DFM Tips for Aluminum
- Use 5052 for complex bends — it has the best formability of all aluminum grades.
- Increase bend radius to 1.5× thickness for 6061-T6 to prevent stress-corrosion cracking.
- Orient bends perpendicular to the rolling grain to maximize formability.
- Account for HAZ strength reduction (40% for 6061) when designing welded aluminum structures.
- Specify anodizing type and compensation on drawings — Type II needs +0.025mm, Type III +0.05mm.
- Design generous corner radii (0.5mm+) to prevent stress concentration and fatigue cracking.
Surface Finishing for Aluminum
Aluminum accepts more surface treatments than any other metal. Anodizing is the most popular, providing integral protection that will not chip or peel.
| Finishing | Suitable Grades | Notes |
|---|---|---|
| Anodizing (Type II) | All aluminum grades | Most common finish: decorative, corrosion-resistant. Link: /surface-finishing/anodizing |
| Hardcoat Anodizing (Type III) | 6061, 7075 (best) | HV 400-600 hardness, 25-100μm oxide layer |
| Powder Coating | All aluminum grades | Unlimited colors, 60-120μm thick, 500h+ salt spray |
| Electrophoresis | All aluminum grades | Uniform coating on complex geometries |
| Brushing/Polishing | All aluminum grades | Decorative finish, brushed or mirror |
| Chromate Conversion | All aluminum grades | Pre-paint treatment, electrical conductivity retained |
What Drives Aluminum Fabrication Cost?
Aluminum material costs 2-3× more than steel, but processing costs are similar. Grade selection and scrap recycling significantly affect total cost.
Material Cost 2-3× Steel
Aluminum raw material is 2-3× more expensive than carbon steel, but processing cost is similar due to easy machinability
Scrap Recyclable
Aluminum scrap has high resale value, reducing net material cost by 30-50% for high-scrap parts
5052 Most Economical
5052 is the most cost-effective grade for sheet metal — widely available, easy to form, lower price than 6061
7075 Premium
7075 costs 3-5× more than 5052 and requires special handling, annealing before bending, and cannot be welded
Cost by Grade and Thickness
| Grade | Thickness | Sheet Price | Fabrication | Note |
|---|---|---|---|---|
| 5052-H32 | 1.0mm | $8 – $12 /m² | $5 – $15 /part | Most economical |
| 5052-H32 | 3.0mm | $22 – $32 /m² | $8 – $25 /part | Standard brackets |
| 6061-T6 | 1.0mm | $10 – $15 /m² | $8 – $20 /part | Welded parts |
| 6061-T6 | 3.0mm | $28 – $40 /m² | $12 – $30 /part | Structural parts |
| 7075-T6 | 1.0mm | $30 – $50 /m² | $15 – $40 /part | Aerospace only |
| 7075-T6 | 3.0mm | $80 – $120 /m² | $25 – $60 /part | High-stress parts |
Prices are indicative for raw material and basic fabrication. Anodizing, welding, and complex geometries are quoted separately. Volume discounts apply at 50+ parts.
Aluminum Sheet Metal FAQ
Answers to the most common questions about aluminum sheet metal fabrication at FIRMFG.
QWhat is the difference between 5052 and 6061 aluminum for sheet metal?
5052-H32 is a non-heat-treatable strain-hardened alloy with excellent formability — it bends easily with a minimum radius of 1× thickness and is the first choice for brackets, enclosures, and formed parts. 6061-T6 is a heat-treatable alloy with higher strength but moderate formability — it requires a larger bend radius (1.5× thickness) and may crack if bent too sharply. 5052 is preferred for complex bends and forming, while 6061 is preferred for welded structures and parts requiring higher strength.
QHow do you handle aluminum bending springback?
Aluminum exhibits moderate springback (1.5–3.5°) depending on the alloy and temper. Our CNC press brake stores springback compensation data per alloy: 5052-H32 requires 1.5–3° overbend, 6061-T6 requires 2–3.5°, and 7075-T6 requires 3–5°. For consistent results, we use bottom bending or coining for critical-tolerance parts, which reduces springback to near zero. We also recommend orienting bends perpendicular to the rolling grain for maximum formability.
QIs aluminum welding difficult?
Aluminum welding requires special procedures compared to steel. The high thermal conductivity (3× that of steel) means heat dissipates rapidly, requiring higher amperage. The oxide layer (melting point 2072°C vs aluminum 660°C) must be removed mechanically or by AC TIG before welding. We use AC TIG welding with 4043 (general purpose) or 5356 (higher strength) filler wire. 5052 welds excellently, 6061 is weldable but loses strength in the HAZ, and 7075 is generally not recommended for welding.
QCan aluminum parts be anodized?
Yes, anodizing is the most popular surface treatment for aluminum. It creates an integral aluminum oxide layer that will not chip or peel. Type II anodizing (10-25μm) provides decorative colors and corrosion resistance. Type III hardcoat anodizing (25-100μm, HV 400-600) provides extreme wear resistance. Note that anodizing builds up on the surface, so threaded holes need pre-machining compensation: +0.025mm per side for Type II and +0.05mm for Type III. See our /surface-finishing/anodizing page for details.
QWhat is the minimum thickness for aluminum sheet metal?
We can fabricate aluminum sheets as thin as 0.3mm. However, very thin sheets (below 0.5mm) are prone to warping during laser cutting and require special handling during bending. For thicknesses below 0.5mm, we recommend using stamping or deep drawing instead of press brake bending. The maximum thickness depends on the process: 6mm for laser cutting and bending, 12mm for welding. Common thicknesses in stock: 0.5, 0.8, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0mm.
QHow much does aluminum sheet metal fabrication cost?
Aluminum sheet metal fabrication costs 2-3× more than equivalent steel parts due to higher material cost. However, the weight savings (1/3 of steel) often justify the premium for aerospace, automotive, and electronics applications. 5052 is the most economical grade, costing 20-30% less than 6061. 7075 costs 3-5× more than 5052 and is reserved for high-stress aerospace applications. Aluminum scrap has high recyclable value, which can offset 30-50% of material cost for high-scrap parts.
Applications of Aluminum Sheet Metal
Aluminum is used wherever weight reduction, corrosion resistance, or thermal management is critical.
Electronic Enclosures
Device housings, PCB enclosures, heat dissipation cases
Aerospace Parts
Lightweight structural parts, panels, brackets
Automotive Lightweighting
Body panels, battery trays, structural components
Heat Sinks
Thermal management, cooling fins, heat exchangers
Signage & Displays
Architectural panels, branded signage, display frames
Consumer Products
Appliance housings, decorative hardware, lifestyle products
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Learn MoreStart Your Aluminum Project
Upload your CAD files and get a free aluminum fabrication quote within 24 hours. Our engineers provide grade selection advice, DFM feedback, and anodizing recommendations at no cost. 5052/6061/7075 in stock, 3-day turnaround.