ROTHENBERGER ROWELD D 2/10 - Manual (Page 25)

ENGLISH 23
Driven by a powerful electric motor (1), the welding rod (2) is fed into the extruder (3) and granu-
lated by the extruder screw in the process. The screw forces the granulate into the extruder noz-
zle, melting it into a homogeneous, completely plastified mass. As the molten material exits the
extruder nozzle, it is moulded by a welding shoe (4) to the geometry of the weld seem to be de-
posited.
Preheating of the base material to be joined is accomplished by a preheating nozzle (5) which is
supplied from an integrated hot air unit (6). Air supply is via an on-board blower.
Melt and preheat temperatures are controlled separately. The set point and momentary values
are displayed concurrently.
For the drive interlock to be released for starting, the melt and preheat air temperatures must be
above the start interlock temperature and the startup timer must have timed out. The start inter-
lock temperature and the startup time can be separately set for the melt and preheat air.
The temperature-controlled start interlock prevents the drive from starting if there is still unmol-
ten material in the extruder, thus precluding damage to the unit.
The output rate is variable so that the preheat temperature can be matched to the weld thick-
ness.
5 Startup and Shutoff
5.1 General
In addition to the operating instructions and the national and local accident prevention regula-
tions applicable at the place of use, the acknowledged technical rules for safe and proper work-
ing practices must be observed.
Any working practices posing a safety risk are prohibited.
Before starting / shutting off the hand extruder, make sure to carefully read the instructions un-
der section “Safety”.
Only trained and qualified personnel may be assigned to the operation of the hand ex-
truder.
5.2 Preparation
• Place hand extruder on a firm support and secure them against toppling over as shown in
the illustration.