The welding is composed of the following parts:frame,movable and
stationary platens with clamping devices,magnifying,control
device,transmission mechanism,guide,adjusting device,pneumatic and hydraulic pressure
system,cooling water system,welding transformer,button switch panel and
control cabinet etc.The clamping device is operated by pneumatic
pressure in initial pressing and by hydro-pneumatic pressure in advanced
pressing.Under the condition of an equal clamping force,this sort of
pressure system is more compact than the single pneumatic pressure type
and has a quicker clamping speed as compared with the single hydraulic
pressure type. http://www.autoweldingmachine.com