MANUFACTURING / Manufacturing & QC
CNC cutting, assembly welding, straightening drilling, shot blasting coating — full-process quality control, supporting overseas project standards and third-party inspection.
MANUFACTURING PROCESS
Every steel component goes through a rigorous manufacturing process and quality inspection to meet project design requirements and export standards.
原材料核验
All steel materials are verified with mill test certificates (MTC), visual inspection and dimensional checks upon arrival. Common grades include Q235B and Q355B (equivalent to ASTM A36 and A572 Grade 50). Special grades can be specified per project requirements. Each batch is traceable through material documentation.
切割下料
CNC laser cutting and multi-head plasma cutting equipment are used for precise cutting of steel plates and sections according to detailed drawings. 30kW laser cutting machines handle high-precision thin plate cutting, while multi-head plasma cutters handle medium and thick plate batch cutting. Nesting optimization maximizes material utilization.
组立焊接
H-beams and box columns are assembled using professional assembly machines, then main welds are applied with twin-wire submerged arc welding machines. Welding procedures follow project standards with certified welders. Critical welds undergo Welding Procedure Specification (WPS) and Procedure Qualification Record (PQR) to ensure quality.
矫正钻孔
Welded members are straightened using 80-ton straightening machines to ensure flange flatness meets specification requirements. Gusset plates and connection plates are drilled with CNC drilling machines for precise hole positioning required for high-strength bolt connections. Dimensional re-inspection is performed after straightening and drilling.
异形构件加工
For complex components such as pipe trusses, box columns and custom connections, 8-axis CNC pipe cutting robots are used for precise cutting and bevel processing. Complex joints are fabricated with manual welding and specialized fixturing to ensure welding quality and dimensional accuracy. All custom components are managed by drawing-based numbering.
表面处理
After welding, components enter the surface treatment process. Shot blasting is performed with 3.2m x 2.8m blasting machines to achieve Sa2.5 grade surface preparation. Epoxy zinc-rich primer and polyurethane finish coats are applied in a dedicated paint workshop. Hot-dip galvanizing or other corrosion protection options are available per project requirements.
质量检验
Full-process quality control includes: raw material inspection, cutting dimensional check, welding visual inspection, non-destructive testing (UT/MT), member dimensional re-inspection, and coating thickness measurement. Quality hold points are set at critical stages, with inspection approval required before proceeding. Third-party inspection (SGS, BV, etc.) is supported per client request.
编号包装
Inspected components are marked and labeled according to erection drawings for quick identification and positioning on site. Packing plans are developed based on member dimensions and transport requirements, including bundling, protection and packing lists. For export projects, container loading plans are provided to maximize container utilization and ensure transport safety.
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