The flaws in NB/T47014-2011
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According to page 51 of the standard NB/T47014-2011, it is possible to manufacture pqr values of 25, thereby achieving full coverage. But this domestic standard has one flaw: 25mm should not be considered a standard thickness for steel plates. So why can’t steel plates with a thickness of 24mm or 26mm replace those with a thickness of 25mm? Is there really a significant difference in the weldability of 24mm and 26mm steel plates compared to 25mm steel plates? http://bbs.hcbbs.com/thread-1410181-1-1.html
When preparing weld overlay test specimens, the thickness of the base layer is usually chosen to be the minimum value; in that case, 25 is practically useless. Because choosing a value less than 25 means the coverage area will be greater than the selected thickness; generally, efforts are made to choose a value as small as possible.
When preparing weld overlay test specimens, when selecting the thickness of the base layer of the specimen, it is advisable to choose the minimum value possible