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介绍一种经过改进后的磁粉探伤仪，用它来进行压力容器内外焊缝表面及大型焊接件焊缝表面的探伤，可节省人力，减轻劳动强度，提高探伤速度和工作效率。
An improved magnetic particle flaw detector is introduced to detect flaws on the surface of weld and weld on the inside and outside of pressure vessel and on the surface of large weldments, which can save manpower, reduce labor intensity and improve inspection speed and working efficiency.