HF225 manual hydraulic butt welder
Simply Better.
Simply Better.
Simply Better.
Simply Better.
FUSIONMASTER®
and
DIXON
®
are registered trademarks of Dixon Industries Pty. Ltd.
©August 2002
Revised August 2013
Page 13
6.
Notes About Heater Plates And Temperature
6.1.
PE Welding Temperatures
Polyethylene pipe is weldable at temperatures ranging from 180°C to 260°C. However butt fusion
parameters typically specify 220 ±15°C which is the required surface temperature of the heater
plate.
Temperatures greater than 240°C when coupled with long heat soak times may result in
diminution of the anti-oxidants in the pipe.
Cold joints will result if the weld temperature is too low, or the heat soak time is too short, or the
time between removal of the heater and butting the pipes together is too long.
Caution:
Either situation may lead to premature joint failure.
6.2.
Heater Plate Temperature
Heater plate temperature displays generally indicate the internal heater temperature. Actual
surface temperature may vary from the display, and will also fluctuate, for the following reasons.
1.
The rate of heat loss from the heater surface depends on the design of the heater
plate and temperature controller. The surface temperature could be significantly
different to the thermometer indication. This variation will be greatest on cold,
windy days. Always use a shelter when welding in these conditions.
2.
As power input cycles on and off the temperature will be highest just after the
power cycles off and lowest just as it cycles back on.
3.
The temperature is unlikely to be exactly the same at every point on the heater
surface due to manufacturing tolerances.
4.
As heat is transferred into the pipe during heat soak, the heater temperature
initially falls but eventually returns to the set point.
6.3.
Measuring Surface Temperature
1.
Always wait 5 minutes after the heater has first reached set temperature for the
temperature to stabilize before recording measurements.
2.
Take readings at several points (at 3, 6, 9, 12 o’clock) on both sides of the heater,
at the diameter of the pipe being welded.
3.
FUSIONMASTER
heater plates are fitted with non-stick replaceable cloth. It is
essential to use a contact probe to force the cloth into intimate contact with the
plate. (Incorrect readings will result when the cloth system traps an insulating air
layer between the cloth and the heater surface.)
4.
If a contact probe is used it should be held in position for several seconds before
the reading is taken.
5.
If an infra red pyrometer is used incorrect reading are likely to result unless:
•
the emissivity is set at 0.95 for use on the non-stick cloth;
•
the device is held square to the surface being measured;
•
the non-stick cloth is forced into intimate contact with the heater plate (see
suggestion below).
6.
Never use an infra-red pyrometer to take a reading from a shiny aluminium
surface (such as a
FUSIONMASTER
heater without cloths, or the outer rim of
a heater plate) or an error will result.
Suggestion
Use a "spot control adapter" fitted to an Infra-red pyrometer for consistently
accurate measurements. When pressed squarely against the heater surface
the infra-red beam is correctly focused every time, and intimate contact
between the heater plate and non-stick cloth is assured.
Note:
It
is
not
physically
possible
for
heater
surface temperatures to
vary significantly from
one point to another. If
such
a
variation
is
observed, it is most
likely to result from
using
an
incorrect
temperature measuring
technique.
