spiral cone
2.It is? feasible to replace lap welding with butt welding to improve quality of mid?diameter spiral weld pipe?In this paper,cone?cylinder?mandrel forming and horizontal roll extruding technology for butt welding is reported??φ219 mm×7 mm pipe has been produced successfully?Test results show that butt welding can be used in production of spiral weld pipe???
4.A cone-shaped pulley with a spiral groove, used in a cord- or chain-winding clock to maintain even travel in the timekeeping mechanism as the force of the mainspring lessens in unwinding.
5.During past year, 28 times of measurements for two units of B plant of Zhelin hydropower station were made , the states of pressure pulsation in the draft cone tube, head cover and spiral case of units were acquired under different water heads, and the influences of that on safety and stability of units operations were also acquired.

