Effects of segregation on the mottling appeared on radiographs of stainless steel weldments.
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In previous work it has been shown that diffraction effects in the relatively coarse-grained metal of the weld is a prime cause of the mottling.<BR>However, the mottling is most commonly observed in thin welds when one is using low voltage X-rays, with which differential absorption will be greater. There appears to be a possibility that a part of the mottling might be due to small differences in X-ray absorption in individual grains in the metal.<BR>The extent of the contribution of the differential absorption to the mottled appearance of radiographs has, therefore, been studied using austenitic stainless steel welds.<BR>Experimental results show that the extent of the contribution from the differential absorption is unimportant in so far as the austenitic stainless steel weld is concerned.
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