Q355 Steel D28 Welding Table Double Stress Relief Anti Deformation Design

Residual stress is the hidden enemy of welding fixture accuracy. Our Q355 Steel D28 Welding Table Double Stress Relief Anti Deformation Design solves this pain point with a two-stage stress-removing process and an engineered anti-distortion framework. Manufactured from Q355 high-tensile steel and fitted with Φ28 H7 precision holes on a 100mm pitch grid, this modular platform maintains reliable geometric stability under cyclic welding heat and heavy static loading. Swap and combine standard D28 clamps and locators freely for custom jigs — a solid foundation for precision heavy fabrication and automated welding cells.

The entire platform is not a solid steel slab, but rather a box-type welded structure consisting of a top plate, an internal grid of stiffening ribs, a primary bottom girder framework, and supporting legs — all constructed from Q355 low-alloy, high-strength steel:

1. Top Plate: A 25mm-thick Q355 steel plate, cut from full-sized sheets to minimize seams. For extra-large platforms (exceeding 4m), joints are welded using full-penetration, equal-strength groove welds; the seams are then ground flush and subjected to an aging (stress-relief) process.
2. Internal Stiffening Ribs: A symmetrical, grid-like arrangement of ribs spaced at equal intervals. The thickness and height of these ribs are engineered according to the required load-bearing capacity. They are fully welded to both the top plate and the bottom plate with continuous, uniform weld beads to prevent localized stress concentrations. (In contrast, many low-cost platforms use spot-welded or asymmetrically spaced ribs, which are the primary cause of subsequent deformation.)
3. Primary Bottom Girder Framework: Constructed with full-length main girders — rather than short, fragmented square tubing — to resist bending under concentrated loads. High-specification models include additional diagonal bracing to suppress torsional distortion.
4. Supporting Legs: Independent load-bearing legs, bolted to the platform framework (rather than permanently welded) to facilitate leveling, disassembly, and transport. Each leg is equipped with an integrated leveling screw.

• Tabletop thickness: 25mm Q355 steel plate
• Hole system: D28 (Φ28mm holes) in a 100 × 100mm grid, precision-bored to H7 tolerance
• Flatness: Standard ≤0.1mm / 1000mm; high-precision (Grade 0) version ≤0.05mm / 1000mm (achieved via robotic welding)
• Load capacity: Standard 3–5 tons/m²; reinforced-frame version 8–10 tons/m²
• Surface treatment options: Blackening or nitriding (HV550–900) — provides resistance to weld spatter adhesion and rust
• Configuration: 2D (single-sided) welding table / 3D (five-sided) welding table (featuring D28 holes on the top surface and all four sides)