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简述了１６２０ｍｍ内承式螺旋焊管机组的组成及其特点，论述了内承式成型法的优点，通过试验验证提出了调型数学关系式，为设计与应用提供了科学依据。
The composition and characteristics of 1620mm internal screw-spliced spiral welded pipe unit are briefly described. The advantages of internal forming method are discussed. The mathematic relation of adjusting type is presented through experimental verification, which provides a scientific basis for design and application.