D28 3D Welding Table for Shipyard and Marine Fabrication
Our D28 3D Welding Table for Shipyard and Marine Fabrication is a robust modular fixturing solution specially designed for shipbuilding and offshore steel fabrication. The full 5-sided D28 hole grid supports 3D multi-direction clamping. With stress-relieved box structure and nitrided working surface, it stays stable under heavy loads and harsh marine workshop environments. It can be freely combined to build large work bases for hull parts, lifting lugs and marine pipe assemblies, greatly cutting your cost on custom fixed jigs.
Dimensions & Specifications
| Table Size (L × W) | Hole Pattern | Material Option | Total Uniform Static Load |
|---|
| 1000 × 800 mm | Φ28mm H7, 100×100mm grid, 5-sided holes | Q355 Steel (Nitrided) / HT300 Cast Iron | Up to 3 tons |
| 1500 × 1000 mm | Φ28mm H7, 100×100mm grid, 5-sided holes | Q355 Steel (Nitrided) / HT300 Cast Iron | Up to 4 tons |
| 2000 × 1000 mm | Φ28mm H7, 100×100mm grid, 5-sided holes | Q355 Steel (Nitrided) / HT300 Cast Iron | Up to 6 tons |
| 3000 × 1500 mm | Φ28mm H7, 100×100mm grid, 5-sided holes | Q355 Steel (Nitrided) / HT300 Cast Iron | Up to 8 tons |
| 2000 × 4000 mm | Φ28mm H7, 100×100mm grid, 5-sided holes | Q355 Steel (Nitrided) / HT300 Cast Iron | Up to 10 tons |
- 5-sided holes: Holes machined on tabletop + four vertical side faces for 3D multi-angle clamping.
- Nitriding: Surface hardness HV550-900, nitrided layer depth 0.3-0.5mm, anti-weld spatter & mild salt spray resistance.
- Load capacity: Refers to evenly distributed static load. Concentrated single-point load is not recommended.
- Scalability: Multiple welding tables can be spliced together via D28 locking pins for large hull segments and marine structures.
- Customization: Custom dimensions, local reinforced plate and slag trough available upon request.
CNC Machining Process for Holes
- Welding of the complete box structure → Manual stress-relief aging → Rough milling of all six faces → Secondary aging → Precision CNC milling, drilling, and reaming of five faces in a single setup
Key Point: The top surface and four side walls are machined in a single setup. This ensures perpendicularity between the holes, the top surface, and the side walls, eliminating cumulative errors caused by multiple re-clamping operations. Many low-cost manufacturers machine the top surface and side plates separately; this results in poor perpendicularity after assembly and causes cross-face tooling to jam.
Hole machining process: Drilling → Counterboring/Enlarging → Precision reaming to H7 tolerance. The Φ28 H7 specification implies a hole diameter tolerance of 28mm (+0.021 / 0 mm), ensuring smooth insertion and removal of locating pins while maintaining minimal clearance for stable, repeatable positioning.
C2 chamfering at hole openings: Removes burrs to prevent scratching the outer surface of locating pins and prevents welding spatter from snagging on the hole edges.
X/Y coordinate grid lines: Laser-etched markings on the table surface (not paint). Painted markings peel off quickly when exposed to the high-temperature welding spatter common in shipyards; laser-etched markings are wear-resistant and suitable for long-term use in layout and scribing inspections.
Core Difference: Standard manufacturers machine the plates before welding the box structure, leading to welding deformation that distorts hole spacing. We perform overall CNC machining only after the box structure is formed and stress-relieved, ensuring long-term stability in hole spacing accuracy.
Product Highlights
3D Clamping Across All Surfaces: D28 holes on the top and all four sides enable multi-angle clamping—including side, vertical, and inclined orientations—making the positioning of complex, irregular hull components highly convenient.
Infinite Scalability: Multiple platforms can be joined using locating pins and bolts to create massive tooling bases spanning tens of meters—ideal for large hull sections, a critical requirement for shipyards.
Tooling Reusability: A single set of fixtures can accommodate components for various ship types, eliminating the need to fabricate custom welding jigs for each batch; this significantly reduces tooling costs and minimizes changeover times.
Resistance to Thermal Welding Deformation: A box-type reinforcement structure combined with aging treatment effectively controls dimensional deviations caused by welding shrinkage in steel hull structures.
Compatibility with International Standards: The D28 system is a globally recognized standard for 3D welding tooling, ensuring compatibility with fixtures from European and American brands—facilitating projects for overseas shipyards.
Product Certifications
Our D28 3D Welding Table meets EU Machinery Directive 2006/42/EC and follows EN ISO 12100 machinery safety standards. CE marking confirms the table's mechanical safety design, including anti-collision rounded edges, built-in lifting lugs and stable load-bearing structure. A signed Declaration of Conformity is available upon request for your customs clearance and site audit.
Ready to discuss your marine fabrication project requirements?
Contact us today to get a custom quote and technical data sheet for our D28 3D Welding Table for Shipyard and Marine Fabrication.
Our engineering team is ready to help you select the right table size and fixturing kits to optimize your shipyard welding workflow.
