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• Heating Stage – In this stage, t
in contact with the heating element, soaking heat from it; the
pressure is reduced to drag pressure (P
value tables in the Appendix.
• Change-over Stage – In this stage, t
shut off from the pipes, the carriage moves apart to the far end
to allow taking the heating element out from in-between the
pipes.
• Joining and Cooling Stage – This stage is characterized by a
succession of events. First, after change-over, the pipe butts are
put together and pressure increases as a linear ramp to drag pres-
sure (P
) plus P
from the welding value table in the Appendix (t
t
5
in the diagram). Then, the joint cools down at P
pressure is completely removed from the the pipes (t
gram) or until pressure is reduced to one-third of P
into t
in the diagram); in the second case, cooling is completed
5
at the reduced pressure.
Pipe and fitting manufacturers may include data on how long
the new joint should not be exposed to external strain. Also, the
applicable welding standard may require a minimum cool-on time
after pressure shut-off (t
t
is not relevant to the welder.
6
P
P
+ P
+ P
P
P
1
1
t
t
P
P
2
2
t
t
1
1
4.3
Performing the Welding Process
To s t a r t w e l d i n g , c l a m p t h e p i p e s i n t o t h e m a c h i n e
chassis. Use the appropriate reducer inserts if the component
size is smaller than the basic machine chassis. When the fourth
clamp of the machine is removed, tees and elbows can be processed.
4.3.1 Facing the Pipe Butts
To ensure that the pipe butts are level, insert the pipe facing tool be-
tween the machine carriages and turn it on. Using the carriage mover
lever on the hydraulic unit, have the movable carriage close in toward
the center in order to bring the pipes into contact with the facing tool.
Use the pressure regulator to adjust the pressure manually while the
facing tool is trimming the pipes.
The farther the carriage mover lever is pushed to the left, the
faster the carriage closes in and the faster pressure increases.
The farther it is pushed to the right, the faster the carriage of
the machine moves apart, and the faster pressure decreases.
Info
Pipe facing should continue until shaving forms a continuous blade
that rolls twice or three times around the pipe ends, so the butts are
level. Facing is stopped by moving the carriage apart with the car-
riage mover lever.
Version April 2020
in the diagram, the pipes remain
2
) plus P
t
in the diagram, pressure is
3
in the diagram). In most cases, however,
6
P
P
+ P
+ P
5
5
+ P
+ P
t
t
t
t
t
t
t
t
2
2
3
3
4
4
Manual Hydr. 250 User's Manual
from the welding
2
+ P
, either until
t
5
in the dia-
5
(10 seconds
5
t
t
t
t
t
t
t
t
5
5
6
6
4
11
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