Performing The Butt Welding; Facing The Pipe Butts; Checking Pipe Alignment And Determining Drag Pressure - HURNER Hydr. 355 2.0 Manual De Instrucciones

ternal strain. Also, the applicable welding standard may
require a minimum cool-on time after the pressure was
shut off from the new joint (t
cases, however, t
4.3

Performing the Butt Welding

To start welding, clamp the pipes into the machine chassis.
Use the appropriate reducer inserts if the component size is
smaller than the basic machine chassis. If Tees, elbows, and
other short pipeline components are planned to be welded,
reconfigure the machine chassis as described in Sect. 3.4.
4.3.1

Facing the Pipe Butts

To ensure that the pipe butts are level, insert the pipe fac-
ing tool between the machine carriages and turn it on. Us-
ing 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
Info
right, the faster the carriage of the machine moves
apart, and the faster pressure decreases.
Pipe facing should continue until shaving forms a continu-
ous 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 carriage mover lever.
If you discover after the facing process that the butts are
still not flush and level, start over, insert the facing tool
and repeat the process. When facing is properly done, pipe
alignment has to be checked.
4.3.2

Checking Pipe Alignment and Determining Drag Pressure

When the pipes are properly faced, close in the movable
carriage completely to check whether a potential vertical
and horizontal pipe misalignment is within the tolerance
allowed by the applicable welding standard. If pipe align-
ment is in order, the welding proper can start. If the mis-
alignment is outside tolerance, the pipes must be readjusted
in the clamps and, if needed, facing has to be repeated.
When pipe alignment is appropriate, move the carriage
apart using the carriage mover lever; make sure the mov-
able carriage is as far apart as possible before continuing.
Turn the maximum pressure regulator counter-clockwise as
far as it will go to have zero pressure in the hydraulic circuit.
14
EN
in the diagram). In most
6
is not relevant to the welder.
6
HÜRNER Manual Hydr. 355 2.0 User's Manual
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Version October 2021