Hürner WeldControl EF 355 Manuel Utilisateur page 50

In a fully manual welding process, pipe facing, pipe
alignment check, determination of the pressure to
"drag" the carriage along and of the joining pres-
sure (i.e., the maximum pressure of the welding,
reached during bead build-up and joining) have to
be performed in the exact same way as in the WeldContol Mode (see
the relevant sub-sections of Section 4.3). The only difference is that
the display does not provide any hints as to what to do. It just works
as a digital gauge indicating the actual pressure applied to the pipes
(see Display 31). It also shows the nominal temperature the welder
has to set and the actual temperature of the heating element, and it
monitors and controls the temperature throughout the process. The
parameters for proper welding have to be looked up in the welding
value tables in the appendix.
The farther the carriage mover lever is pushed to the left,
the faster the carriage closes in and the faster pressure in-
creases. The farther it is pushed to the right, the faster the
carriage of the machine moves apart, and the faster pressure
Info
decreases.
The nominal temperature, at which the hydraulic and control unit
should keep the heating element, can be changed using the ñ and ò
cursor keys. After such a change, the display shows the actual tem-
perature changing slowly to the new nominal temperature.
The welder must wait for the display to show the new nominal
temperature before using the machine!
Important
The welding proper has the four stages in the diagram below that are
explained in the following sections. It is under the welder's responsi-
bility to verify the correct welding pressures and times.
Before the welding process starts, the drag pressure has to be deter-
mined with care. Move the movable carriage apart, turn the pressure
regulator counter-clockwise as far as it will go, then bring to mover
lever to the close-in position and gradually turn the pressure regula-
tor clockwise. Watch the display and note the pressure that "drags"
the carriage sufficiently to set it in motion. This is the drag pressure
P for this welding.
t
The exact drag pressure depends on various conditions (pipe
size and material, position/altitude of the machine, etc.) and
has to be determined for every welding individually. The
Important
value P is needed to compute the bead build-up, the heat-
t
ing, and the joining pressures needed for jointing (stages t
t , and t in the welding diagram respectively).
2 5
P + P
P
1 t
P
2
t
1
22
EN
P + P
5
+ P
t
t t t
2 3 4
HÜRNER WeldControl EF 355 User's Manual
H Ü R N E R S c h w e i s s t e c h n i k G m b H
t
t
t t
5 6
Nieder-Ohmener Str. 26
35325 Mücke, Germany
*** MANUAL MODE ***
220°C NOM. ---.-bar
219°C ACT. 016.0bar
Display 31
,
1
Version January 2018