Service Overview
Full-Service Metal Weldments & Turnkey OEM Fabrication
Qiaodi Steel delivers end-to-end manufacturing solutions for heavy structural weldments, machine frames, pressure-tight enclosures, and complex OEM metal assemblies. Operating from Wuxi—China’s primary industrial manufacturing and steel distribution hub—we integrate raw material sourcing, laser cutting, precision bending, certified welding, machining, and final mechanical assembly under one roof.
Whether you require heavy-duty stainless steel base frames for industrial pumps, structural skid platforms, or multi-component mechanical assemblies, our certified welders and mechanical engineers work directly with your STP, STEP, DWG, and PDF CAD models to deliver fully tested, ready-to-integrate OEM solutions.
Core Capabilities & Assembly Services
- 01 / Certified Structural & Sheet Metal Welding
- Capabilities: TIG (GTAW), MIG (GMAW), Flux-Cored (FCAW), and Submerged Arc Welding (SAW) for stainless steel, carbon steel, and structural alloy frameworks.
- Compliance: Experienced welders trained in AWS D1.1 (Structural Steel), AWS D1.6 (Stainless Steel), and EN ISO 3834 welding quality standards.
- 02 / Heavy Machine Frames & Skid Fabrication
- Capabilities: Large-scale structural frame welding, pump/compressor skids, tank structures, and heavy equipment bases with minimal thermal distortion.
- Process: Pre-welding fixture design, stress-relieving heat treatment, and post-weld precision CNC machining on critical mounting surfaces.
- 03 / Turnkey OEM Mechanical Sub-Assemblies
- Capabilities: Complete assembly of welded frames with custom CNC machined parts, pipe fittings, flanges, fasteners, hardware, and bought-out components.
- Testing: Trial assembly verification, thread fit checks, structural alignment, and operational clearance testing prior to packaging.
- 04 / Post-Weld Surface Treatment & Finishing
- Capabilities: Weld seam grinding, pickling & passivation for stainless steel, shot blasting, sandblasting, high-durability powder coating, and hot-dip galvanizing.
Technical Specifications & Inspection Standards
Manufacturing Standards & Quality Verification
| Parameter | Technical Specifications & Capabilities |
| Welding Processes | TIG (GTAW), MIG/MAG (GMAW), FCAW, Spot Welding, Orbital Pipe Welding |
| Supported Materials | Stainless Steel: 304, 304L, 316, 316L, 310S, Duplex 2205 / 2507 Structural & Carbon Steel: Q235, Q355, S235, S355, A36, 1045, 4140 Aluminum Alloys: 5083, 6061-T6, 7075 |
| Welding Quality Standards | AWS D1.1 / AWS D1.6, ISO 3834, ASME Section IX |
| Machining After Welding | Post-weld CNC milling and boring on large frame mounting surfaces (Up to $\pm 0.02\text{ mm}$ flatness) |
| Non-Destructive Testing (NDT) | Liquid Penetrant Inspection (PT), Magnetic Particle Testing (MT), Ultrasonic Testing (UT), X-ray Radiography (RT) |
| Accepted Drawing Formats | 3D Models: STP, STEP, IGES, X_T / 2D Engineering Drawings: DWG, DXF, PDF |
Quality Control & Trial Assembly Verification
- Rigorous NDT & Weld Inspection: 100% visual inspection (VT) of all weld seams for throat size, undercut, and porosity, backed by Liquid Penetrant (PT) and Ultrasonic Testing (UT) upon project requirements.
- Post-Weld Machining Accuracy: Mounting pads and pin holes are CNC-machined after stress-relieved welding to guarantee tight parallelism, perpendicularity, and hole-center tolerances.
- 100% Pre-Shipment Trial Assembly: OEM assemblies undergo complete factory dry-fitting and clearance verification to ensure trouble-free integration at your facility.
- Full Documentation Package: Delivered with EN 10204 3.1 Material Traceability Certificates, Weld Inspection Reports, CMM/Dimensional Inspection Logs, and Surface Treatment Reports.
Custom Packaging & Export Protection
- Heavy-Duty Structural Crating: Large weldments and frames are secured on custom steel-reinforced wooden skids or framed pallets.
- Corrosion & Impact Protection: Wrapped with anti-corrosion VCI plastic film, protective bubble wrap, and wooden corner blocks to prevent transport damage during ocean transit.
- Container Loading Supervision: Custom tie-down straps, steel cables, and dunnage bags used inside ocean containers to guarantee zero movement.