not more than 2 percent of the thickness of the plate. They containidentification markings and holes that must show clearly at each end ofthe radiograph. The entire length of the welded joint is photographed.The purpose of these penetrometers is to ensure the correct exposuretime of the x-ray. An image of the holes in the penetrometer appearson the x-ray film, and therefore any flaws of equal or larger sizewould be expected to appear. The ASME code specifies the acceptancestandard as to the size of porosity and defects from slag inclusion
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