Issues regarding penetrant testing of the bottom weld bead in the furnace tube of SH3417
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Dear teachers, according to clause 7.2.2 of SH3417, 100% penetrant testing must be carried out on the root pass of furnace tube welding, and 100% radiographic inspection must be performed on the welds of butt joints. Since radiographic inspection is required, why is penetrant testing also needed? Is it to avoid unnecessary rework?
Penetrant testing is what I refer to here as coloring treatment; it is used to check for cracks on the surface of welds. On the other hand, flaw detection is used to identify welding defects such as slag inclusions and bubbles within the welds; if such defects are found, they must be removed and the weld reworked. That’s how I understand it