ODM Spot Welding Suppliers & Manufacturers

For critical CNC-milled and turned features, we consistently hold tolerances to ±0.005 mm, with standard production features held to ±0.01 mm. For spot-welded multi-component sub-assemblies, our in-house pneumatic and servo-controlled positioning jigs maintain center-to-center hole tolerances within ±0.05 mm post-fusion. Final achievable tolerances depend on the specific alloy, sheet thickness, and thermal geometry, and are reviewed in detail during our 24-hour DFM engineering audit.

We employ Medium Frequency Direct Current (MFDC) inverters and projection welding geometries instead of raw capacitive spikes. By designing raised embossments or coined projections onto the stamped metal component, the thermal energy is concentrated precisely at the contact node during the first few milliseconds ($t_w$). Water-cooled copper-zirconium electrodes deliver continuous holding pressure during the forge phase, completely containing molten nuggets and eliminating superficial heat discoloration on class-A exterior surfaces.

Precision 3-, 4-, and 5-axis CNC machining, Swiss lathe turning, metal progressive stamping, and custom spot/projection welding are executed in Sunmy-owned Shenzhen plants. Specialized heavy casting and specific chemical electroplating are performed by ISO-certified, audited long-term tier-1 partners. All final quality control, coordinate measuring machine (Zeiss CMM) inspection, weld shear destructive tests, and First Article Inspection (FAI) reports are conducted directly in-house by our QA engineers before overseas packaging.

Sunmy signs a legally enforceable bilateral Non-Disclosure Agreement (NDA) with your organization before transferring any 3D models or product specifications. You interface directly with our internal engineering leads in Shenzhen—eliminating trading agents or unvetted subcontract networks. All digital files (.STEP, .IGES, .DWG) are stored on encrypted internal servers with role-restricted engineering access.

Yes. We facilitate early rapid prototyping via multi-axis CNC billet milling, wire EDM, and single-point manual resistance welding fixtures. This enables our clients to carry out tensile load validation, vibration testing, and aerodynamic checks. Once the design freeze is completed, we transition the part to high-efficiency progressive stamping tooling and multi-head automated spot welding cells for scalable mass production.

Each batch includes a complete quality assurance dossier: raw material heat-lot test certificates (EN 10204 3.1), CMM dimensional verification reports, pull-force/shear strength destruction test records, plating/coating thickness readings (XRF), and RoHS/REACH compliance documentation.