The fillet weld of the high recollection box and tube seat of the No.1 unit of a power plant, the nozzle specification: Φ51×4, material: P91, 950 nozzle seats were comprehensively tested by FGI-3D technology, and the test results found that there were cracks and defect signals on the fillet weld of two tube seats, and magnetic particle verification was conducted, and the test results were consistent.
