widos PSM 20 - Page 22

Kunststoffschweißtechnik
Starting and operating Chapter 5
10.12.2013 Working instructions WIDOS PSM 20 Page 22 of 31
 Drive the slides with identified adjusting force and hitchless to the heating element,
<valve lever> on: “FORWARDS“.
 When the prescribed revolving bead height is reached, reduce pressure. For this purpose,
move the valve lever to position: „Pressure release“ until the desired heating pressure is
built up (heating pressure = approx. 10% of the adjustment pressure).
 The heating up time starts now. Press the stop-watch and compare the actual time with the
nominal time taken from the table.
 After expiration of the heating time, open the slides quickly with <valve lever> to
“BACKWARDS“. Slew out the heating element as quickly as possible and close the slide
smoothly, <valve lever> on “FORWARDS“.
 When the welding pressure is built up, press the stop-watch and keep the control lever for
approximately 10s on position „pressure“ so that the hydraulic accumulator can be filled.
During the cooling time re-adjust pressure, if necessary (the pressure for cooling is the
same as the set adjustment pressure).
 After expiration of the cooling time, release pressure, <valve lever> on: „Pressure release“
 Open the clamping beam with foot valves.
 Remove the welded part to one side.
 open the slides <valve lever> on: “BACKWARDS“.
You must remove the spacer now during angle welding (chapter: 4.3).
While welding angles or pipes, open the front clamping beams (chapter: 4.4) and remove the
welded piece to the front.
Afterwards, necessarily shut the open clamping beams again.