In the production of H.F. butt spiral welded pipe, the vertical roll extruding installation with fixed position are changed into horizontal roll installation with fixed pressure.

• 在高频对接螺旋焊管试验生产中，将恒位置立辊挤压装置改为恒压力平辊装置，对两种装置的摩擦参数进行了分析比较。