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4.4.1 Bead Build-up Stage
Use the welding value tables in the Appendix to look up the joining
pressure (maximum pressure to be applied during bead build-up and
joining) appropriate for your situation. Then set the maximum pres-
sure regulator to the appropriate pressure while observing the actual
pressure displayed on the screen, and move apart the carriage of the
machine. Insert the heating element (heating plate), move the carriage
in on the plate and press the pipe butts to the plate at a pressure of
P
+ P
for the bead build-up duration given in the welding value tables
1
t
in the Appendix (t
in the diagram).
1
4.4.2 Heating Stage
After the bead build-up stage (t
pressure must be decreased to below or equal to the level of P
The decreased pressure will then be applied for the entire duration of
the heating stage (t
in the diagram), in which the pipe butts continue
2
to soak heat from the plate. Use the welding value tables in the Ap-
pendix to determine the heat-soaking time (t
pressure (P
+ P
) applicable to your welding situation.
2
t
In the Manual Mode and in the WeldControl Modes, two ways
to reduce the applied pressure are available. Either open the
pressure release valve or press the START/SET key. Pressing
the START/SET key reduces the pressure only as long as you
Info
hold the key down.
Full contact has to be continuously established between the
heating plate and the bead, even with lower pressure. While
heating, if contact between them is lost somewhere along the
Important
circumference, welding has to be aborted and repeated.
4.4.3 Change-over Stage
After the end of the heating, or heat-soaking, stage, set the carriage
mover lever on the hydraulic unit to its move-apart position in order
to move the carriage to the far end. Then remove the heating element
from in-between the pipes.
The change-over has to be followed immediately by the joining stage.
The change-over time given for your welding situation in the tables
in the Appendix (t
) must not be exceeded. If it is, welding has to be
3
aborted and repeated.
4.4.4 Joining and Cooling Stage
Set the carriage mover lever to its close-in position again in order to
move the pipe butts in on each other and to build the joining pres-
sure (P
+ P
) according to a consistent increase. Watch the value on
5
t
the display screen. Building the joining pressure must correspond to a
linearly increasing ramp and its duration must neither be longer nor
shorter than indicated for your welding situation in the welding value
tables in the Appendix at t
Once the joining pressure is reached and has stabilized at P
pressure will be kept at this level until the end of the joining phase (t
the diagram). In this stage, the new joint also starts cooling down.
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 (t
gram). In most cases, however, t
Version January 2018
in the diagram) was completed, the
1
) and the heat-soaking
2
.
4
is not relevant to the welder.
6
HÜRNER WeldControl EF 315 User's Manual
+ P
.
2
t
+ P
, the
5
t
in
5
in the dia-
6
23
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