SY/T 6423.2-2013 Petroleum and natural gas industries.Non-destructive testing (NDT) methods of steel tubes.Part 2: Automated ultrasonic testing of the weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections has been changed from SY/T 6423.3-1999 Petroleum and natural gas industries.Non-destructive testing (NDT)methods of steel tubers for pressure purposes.Ultrasonic testing of the weld seam submerged arc-welded steel tubes for the detection of longitudinal and/or transverse imperfections.
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