Under what circumstances can the diffraction time-of-flight method (TOFD) replace radiographic testing (RT) as a non-destructive testing method for containers?
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This post was last edited by WallaceLee on 2022-6-25 20:39. As the title suggests: 1. Under what circumstances can the diffraction time of flight method (TOFD) replace ray testing (RT) as a non-destructive testing method for containers? 2. On what standard is this explained and clarified?
Refer to the discussion on non-destructive testing: can the diffraction time-of-flight ultrasonic testing (TOFD) method replace radiographic testing? https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=817996&shareuid=301199
This post dates back almost a decade; I’m curious to know how the TOFD testing technology has developed in recent years Can it replace RT?
It is now widely used in thick-walled vessels (such as those with a thickness greater than 26 mm), but based on the current situation, it cannot replace RT.
The last edit to this post was made by zxhslm on 2021-3-11 at 17:28. According to 8.6.1.3 of GB/T12337-2014, radiographic testing should be preferentially used for the butt-welded joints of austenitic steel spherical tanks, while diffraction time-of-flight ultrasonic testing is the preferred method for spherical tanks made of other materials. I’m not sure if this falls under the situation mentioned by the original poster. For an explanation of the selection method, please refer to the standard definition.
Thick-walled vessels, the final butt weld between the head and the cylinder that cannot be accessed from the inside of the vessel, on-site welding inspections, and various other situations