棱形截面 meaning in English

double wedge section
double-wedge section

Including : the realization and motion method of weld machine working location , the technical method for circular cross - section , rhombus cross - section straight tube and cone tube , and introduced some actual examples of pressure fittings , operating system , motion mechanism ' s construction feature and disposition of the weld machines
包括：合焊机组工位移置的实现方法和运行方式；圆形和棱形截面的直管、锥管整形的工艺方法；通过实例介绍了行车式巨型管合焊机组压力装置、操纵系统、行走机构结构特点和焊接设备的配置。