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阐述了穿孔毛管产生同管壁厚差的原因，研究了穿孔和轧管工艺对钢管同管壁厚差的影响。
The reasons for the difference of wall thickness between the perforated capillary tube and the wall thickness of the perforated capillary tube were expounded. The influence of perforation and tube rolling process on the difference of the same tube wall thickness was investigated.