Sheet metal fabrication is the physical foundation underneath virtually every engineered product in Indian manufacturing — from automotive chassis and agricultural implements to architectural facades and solar mounting. At Autotek Steel Engineers, 36+ years of precision fabrication have shaped a manufacturing capability that handles everything from single-piece prototypes to large-volume production runs, with tubular pipe frame specialisation that few Indian fabricators match. This guide walks through what we do, how we do it, and how procurement engineers should benchmark a fabrication supplier.
Our fabrication capabilities
Cutting
- CNC laser cutting — precision profile cutting on sheet up to 20mm thick; excellent edge quality, minimal heat-affected zone.
- CNC plasma cutting — cost-effective on heavier sections.
- Shearing — high-volume straight-cut operations.
- Mechanical sawing — tube and section cutting.
Forming
- CNC press brake bending — multi-axis back gauge, programmable sequences for complex bend patterns.
- Tube bending — mandrel and rotary draw bending for tubular pipe frames.
- Rolling — cylinders, curves and architectural radii.
Joining
- MIG / MAG welding — production welding of steel sheet and tube structures.
- TIG welding — precision and stainless-steel work.
- Spot / resistance welding — high-volume thin sheet assembly.
- Mechanical fastening — riveting, clinching, self-piercing rivets.
Integrated surface finishing
- In-house powder coating, CED coating, zinc plating, heat-resistant painting and liquid painting — complete fabricate-and-finish under one roof.
Tubular pipe frame specialisation
Tubular pipe frames — the welded tube structures that form agricultural implement frames, automotive seat structures, two-wheeler sub-frames, furniture skeletons and architectural handrails — demand specialised fabrication competence. Unlike flat sheet metal, tube fabrication requires:
- Accurate tube mitring — computer-generated fishmouth cuts for clean, strong joints.
- Jig-based welding — purpose-built fixtures to hold geometry true during heat distortion.
- Post-weld stress relief where structural tolerance demands it.
- Inspection and geometry verification — CMM or laser tracker checks against 3D model.
Our Rudrapur facility (Sai Auto Industries) is specifically equipped for high-volume tubular pipe frame fabrication supporting automotive and agricultural OEM supply chains.
Prototype to production workflow
- RFQ & drawing review — 24-48 hour turnaround on technical quotes, including DFM feedback.
- Prototype — single-piece and low-volume builds on shared CNC time; first-article inspection report delivered.
- Pilot run — 50-200 piece validation batch; process capability study (Cp, Cpk) on critical dimensions.
- Production run — dedicated scheduling; SPC monitoring on key dimensions.
- Finishing & delivery — integrated coating + packaged-for-delivery.
Tolerances & standards
Typical sheet-metal fabrication tolerances achievable in our lines:
Tolerances are tied to ISO 2768 (general tolerance medium class) by default; tighter tolerances on specific features available per customer drawing.
Quality systems
- ISO 9001-2008 certified quality management system.
- In-house CMM inspection for critical features.
- Process capability studies — Cp/Cpk reporting on dedicated production runs.
- First-article inspection on every new part number.
- Traceability — material certificates, heat numbers preserved through production.
Industries we fabricate for
- Automotive & two-wheeler OEMs — chassis brackets, tubular frames, body panels, fasteners.
- Agricultural & construction equipment — implement frames, tractor hoods, excavator covers.
- Architectural & construction — facade panels, railings, louvres, canopy structures.
- Furniture manufacturers — tubular office chair and desk bases, filing cabinet frames.
- Renewable energy — solar mounting structures, wind-tower hardware.
- Aerospace & defence-grade work — precision sub-assemblies with traceability.