Equipment Steel Structure Quality Inspection Process: Comprehensive Control from Raw Materials to Finished Products
In the steel structure manufacturing industry, strict quality inspection is crucial to ensure product safety and durability. As a professional Equipment Steel Structure Manufacturer in China, Jiaxing Dingshi Machinery Manufacturing Co., Ltd provides high-standard steel structure products through advanced equipment and a robust quality control system. Below is our end-to-end quality inspection process:
1. Raw Material Inspection
- Steel Material Incoming Check: Verify material certificates (e.g., Q235B, Q355B) and inspect chemical composition, mechanical properties, and dimensional tolerances.
- Surface Quality Inspection: Ensure no cracks, rust, or delamination defects.
- Third-party Retesting (if required): Conduct lab tests for critical parameters (e.g., tensile strength, impact toughness).
2. Cutting & Forming Inspection
- Laser Cutting Accuracy: Using 30kW laser plate-cutting and 20kW laser tube-cutting machines to ensure cutting dimensions meet ±0.5mm tolerance.
- Bending & Rolling Inspection: After forming with a 600-ton press brake, verify curvature, angles, and straightness using 3D measuring instruments.
3. Welding Quality Control
- Welder Qualification: All welders are certified (e.g., AWS, EN 287).
- Weld Inspection:
- Visual Testing (VT): Check for surface defects like porosity and undercut.
- Ultrasonic Testing (UT) / Magnetic Particle Testing (MT): Detect internal flaws in critical load-bearing welds.
4. Machining & Dimensional Verification
- Machining Center Precision: 4m/6m gantry machining centers and vertical machining centers ensure hole positions and flatness meet requirements.
- CMM Measurement: Full-dimensional scanning of complex components against 3D drawings.
5. Surface Treatment & Coating Inspection
- Sandblasting/Shot Blasting (Sa2.5 Grade): Remove mill scale using a 30m shot-blasting machine to achieve surface roughness (40-70μm).
- Coating Adhesion Test: Cross-cut test performed after painting in a 300m² spray booth and 70m² curing room.
6. Final Inspection & Delivery
- Full Dimensional Recheck: Verify assembly interfaces, bolt holes, and other critical dimensions.
- Load Testing (if applicable): Simulate real working conditions for structural strength validation.
- Documentation: Provide material reports, inspection records, and certificates (e.g., ISO 3834, EN 1090).
Dingshi Machinery, backed by RMB 25 million in fixed assets and a stringent quality control system, ensures all steel structure products comply with international standards (e.g., AISC, DIN, GB), supporting safe and efficient project execution. Contact us for customized inspection solutions!
Impact of Steel Structure Surface Treatment (Sandblasting/Painting) on Durability
As a specialized manufacturer of equipment steel structures in China, Jiaxing Dingshi Machinery Manufacturing Co., Ltd fully understands the critical impact of surface treatment processes on the durability of steel structures. With our 15,000 m² production facility and over RMB 25 million in fixed assets investment, we have established a complete surface treatment production line including a 30 m shot blasting machine, 300 m² paint booth, and 70 m² curing room, ensuring optimal anti-corrosion performance for every steel structure product.
Sandblasting Treatment: The First Line of Defense for Durability
Our 30 m shot blasting machine achieves Sa2.5 grade surface cleanliness, which is crucial for coating adhesion. Through high-speed steel shot impact, we can:
- Completely remove mill scale, rust and impurities from steel surfaces
- Create ideal surface roughness of 40-70μm
- Significantly improve mechanical bonding between coating and substrate
Painting Process: Multi-layer Protection System
In our 300 m² modern paint booth, we employ a scientific coating system:
- Primer: Zinc-rich epoxy primer for cathodic protection
- Intermediate coat: Micaceous iron oxide epoxy for enhanced barrier protection
- Top coat: Polyurethane finish for UV resistance
Curing Process: Ensuring Coating Performance
The dedicated 70 m² curing room provides:
- Constant temperature and humidity curing environment
- Complete crosslinking and curing of coatings
- Optimal mechanical properties and chemical stability
Quality Verification
We ensure painting quality through multiple tests:
- Cross-cut adhesion test (achieving ISO Class 1)
- Dry film thickness measurement (complying with ISO 19840)
- Salt spray test (1000+ hours)
Practical Application Performance
Our surface treatment process has been successfully applied to:
- Offshore platform steel structures (resistant to salt spray corrosion)
- Chemical equipment (resistant to chemical media)
- Outdoor building steel structures (UV resistant)
Jiaxing Dingshi Machinery Manufacturing Co., Ltd ensures excellent durability of steel structure products in harsh environments through our comprehensive surface treatment system, providing customers with long-life, low-maintenance steel structure solutions. We continuously optimize process parameters and keep pace with international anti-corrosion technology developments to create greater value for our customers.