Self-test process
| serial number | Production process | Detection content | Require |
| 1 | Raw material inspection | 1.Material acceptance | Steel plates, steel sections, welding materials, etc. must be accompanied by material certificates |
| 2.Appearance inspection | Check for defects such as rust, scratches, indentations, etc. Whether the size specifications meet the requirements of the drawings | ||
| 2 | Cutting and pre-processing inspection | 1.Dimensional accuracy inspection | Dimensional verification after laser cutting, flame cutting and shearing |
| 2. Bevel quality inspection | Check the groove angle, surface flatness, and the absence of cracks. | ||
| 3. Numbering and identification check | Part numbers should be clear and accurate for easy tracking. | ||
| 3 | Assembly inspection | 1. Component size review | Control of component length, width, angle and tolerance. |
| 2. Connector position detection | Hole position, bolt hole center distance and accuracy. | ||
| 3. Pre-assembly trial assembly | Test assembly of key nodes to check assembly accuracy and matching | ||
| 4 | Welding process inspection | 1. Welding Procedure Qualification (WPS) | Ensure welders have appropriate qualifications. |
| 2. Weld visual inspection | The surface should be smooth, without undercut, pores, cracks, slag inclusions, etc. | ||
| 3. Non-destructive testing (NDT) | Ultrasonic UT: detect internal defects. Magnetic particle MT or penetration PT: detect surface and near-surface cracks X-ray RT: To inspect key welds (usually used for important projects).。Carried out in accordance with GB50205, GB/T11345, GB/T3323 and other standards. |
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| 5 | Anti-corrosion/Pre-painting Inspection | 1. Surface cleanliness inspection | Check the rust removal grade (Sa2.5 or Sa3). |
| 2. Roughness measurement | |||
| 3. Primer adhesion test | |||
| 6 | Inspection after painting | 1. Paint film thickness detection (dry film thickness DFT) | |
| 2. Coating uniformity and defect inspection | Paint film sagging, missing coating, bubbles, etc. | ||
| 3. Color and logo inspection | Whether it is consistent with the drawings or specifications. | ||
| 7 | Finished product inspection | 1. Overall dimensions and diagonal review | |
| 2. Check the rationality of node structure. | |||
| 3. Check the weld and surface again. |