“2016.01.28 Discussion on the ultrasonic testing grade for composite steel plates

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Original title: Composite steel plate for tube sheets, with an ultrasonic testing qualification grade of III. (×) The given standard answer is: 5.3.2.2 in GB/T151. Personal understanding: According to 5.3.2.2 in GB/T151, when using explosive welding to create composite plates, the requirements of grade B1 in NB/T47002 must be met, with a bond rate of 0%. It should be Grade I as per Table 8 of NB/T47013.3. What is not clear is that items 3 and 4 in section 6.2.1 of HG/T20581 specify grade III and grade II respectively. (Is this a difference between the factory acceptance specifications for sheets and the re-inspection procedures carried out by the manufacturing unit on those sheets?) ) A piece of advice: The practice of one question per day is excellent, as it not only enlivens the atmosphere of the forum but also encourages everyone to think actively about learning. However, some questions are not rigorous enough; some are subject to certain prerequisite conditions. One should not pose questions based only on a portion of the criteria, as this can easily mislead people. Additionally, the administrator’s intention behind setting this question is provided after the standard answer to help everyone understand it better. It would also be good to reserve a section at the end of the post where everyone can discuss the topic. Wish: To those working in the field of machinery, that even when they can’t make any money, they can still find a sense of warmth and academic progress on the Haichuan Forum.