D16 3D Welding Tables

1) Cast iron model (HT300/HT250): Integrally cast using the resin sand process, featuring a thickened base plate and dense reinforcing ribs; the seamless, one-piece construction eliminates localized deformation, cracking, and defects such as sand holes or porosity.
2) Steel model (Q355): Constructed from 20–25mm thick bent steel plates with a fully welded frame and multi-layer bottom reinforcement; offers a lightweight design and faster delivery.

First stage: Artificial annealing at 600–700°C to eliminate internal stresses caused by casting or welding;
Second stage: Vibratory stress relief combined with prolonged natural aging to release residual stresses, ensuring long-term dimensional stability during use and suitability for high-precision robotic welding applications.

The D16 3D welding table features a monolithic design CNC-milled on five faces, with the top surface and all four sides machined in a single setup;
Holes are drilled in a 50×50mm grid pattern, with diameters strictly controlled to H7 tolerances (Φ16.065–16.149mm);
The table surface features a clearly engraved 50mm grid, and the edges are rounded to prevent accidental impact damage.

The D16 3D welding tables are sealed within a furnace filled with ammonia (NH₃) and held at a constant temperature of 500–570°C for an extended period. At these high temperatures, the ammonia decomposes to release active nitrogen atoms that diffuse into the steel's surface layer, forming hard nitrides; this process enhances hardness, wear resistance, and rust resistance.

A fully automated lapping platform is used to correct flatness and perpendicularity; each hole is inspected using a coordinate measuring machine (CMM), and a complete set of precision data is recorded for the inspection report.