Fabrication & Welding

Sigma specialises in fabrication, forming, and welding for the world’s most demanding aerospace programmes. From lightweight fabrications to large complex assemblies, we manufacture to the tightest specifications across a full range of aerospace-grade materials including aluminium, titanium, steel, nickel, and cobalt-based alloys.

Where complex structures meet exacting standards

Complex Fabrications & Assemblies

Highly complex fabrications and critical components up to 2m in diameter or 1.6m³, produced across aluminium, titanium, steel, nickel, and cobalt-based alloys. Make to print and design-make services available.

Where complex structures meet exacting standards

Complex Structures & Precision Welding

End-to-end precision welding across classified and non-classified parts, with in-house x-ray examination and full quality management. Manual and automated processes across the full range of aerospace-grade metals.

Where complex structures meet exacting standards

Fusion Welding

Manual and automated TIG, plasma, MIG, and MMA welding by certified engineers working to validated data cards. Electron beam and laser welding available through our extended supply chain network.

Where complex structures meet exacting standards

Resistance Welding

Spot, stitch, seam, and micro spot welds across aluminium, titanium, steel, nickel, and cobalt-based alloys. All welds validated against approved data cards and subject to x-ray examination where mandated.

Where complex structures meet exacting standards

Sheet Metal Details & Assemblies

Simple to complex sheet metal parts encompassing laser and waterjet features, formed, riveted, welded, and finished with metal treatments. Traditional hand sheet metal work, wheeling, and mechanical assembly capabilities included.

Where complex structures meet exacting standards

Hydraulic Press Forming

Panel stretch forming up to 3m x 3m, stringer stretch forming up to 6m, and circular casing sizing up to 1.5m diameter. Heat forming capability across multiple sites.

Where complex structures meet exacting standards

Metal Manipulation

Comprehensive metal forming and manipulation across a broad range of aerospace-grade materials. Supporting complex fabricated structures from initial forming through to final assembly.

Where complex structures meet exacting standards

Precision Fabricated Structures

Structures from test rigs and assemblies through to specialist low-volume components. Every structure subject to stringent quality and non-destructive inspection procedures before delivery.

Where complex structures meet exacting standards

Lagging: Thermal & Acoustic

Bespoke acoustic and thermal insulation designed, manufactured, and installed for harsh aerospace environments. Proven across aerospace, power generation, oil and gas, and automotive applications.

Where complex structures meet exacting standards

Thermal Conversion

Annealing, solution, and precipitation hardening for a wide range of aluminium alloys. All equipment Nadcap accredited, regularly maintained, and calibrated to the latest corporate standards.