What we check
Structural fabrication is high volume and repetitive, so the inspection plan relies on sampling: a share of welds by NDE, set dimensional checks and coating readings per lot. We agree the sampling plan with you before the first visit so the reports can be compared from lot to lot.
Where steel structures are fabricated in China
Large fabrication yards for modules and offshore structures are in Qingdao, Tianjin, Nantong, Zhoushan and Zhuhai. Building and pipe-rack steel is fabricated in most industrial provinces.
Non-conformances we find most often
- Undercut, porosity or incomplete fusion on fillet welds.
- Bolt holes misaligned at trial assembly.
- Surface cleanliness below Sa 2½ before priming.
- Dry film thickness below the specified minimum.
- Member marks missing or not matching the shop drawings.
Questions buyers ask
Do you witness trial assembly?
Yes. Trial assembly is often a hold point for pipe racks and modules. The inspector checks overall dimensions, bolt hole alignment and connection fit before the steel is dismantled for shipping.
Can you inspect galvanizing?
Yes. We measure coating thickness against ISO 1461 or ASTM A123 and check for bare spots, ash and drainage defects.