The moving area of the probe should be cleaned of welding spatter, iron filings, oil stains, and other external impurities. The flaw detection probe should be flat and smooth for free scanning, with a surface roughness of R. ＜ 6.3 μ m, which should be polished if necessary.
For welds with excess height removed, the excess height should be polished to be level with the adjacent base metal. Weld seams with excess height, such as those with undercuts, large bumps, and depressions on the surface, should be appropriately ground and smoothly transitioned to avoid affecting the evaluation of inspection results.
