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See Chinese contents: GB/T 40385-2021 GB/T 40385-2021: Non-destructive testing of steel tubes -- Digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections
This document specifies the requirements for X-ray digital testing techniques of the longitudinal weld seam or helical weld seam of automatic fusion arc-welded steel tubes for the detection of imperfections, including the radiographic testing of computed radiography (CR) or digital detector arrays (DDAs). This document also specifies the acceptance levels and calibration procedures of digital radiographic testing. This document also applies to the testing of circular hollow sections.
