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P
+ P
P
1
t
t
1
right, the faster the carriage of the machine moves
apart, and the faster pressure decreases.
The nominal temperature, at which the hydraulic and con-
trol unit should keep the heating element, can be changed
using the ñ and ò cursor keys. After such a change, the dis-
play shows the actual temperature changing slowly to the
new nominal temperature.
Be sure to 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
above that are explained in the following sections. It is the
welder's responsibility to verify the correct welding pres-
sures and times.
Before the welding process starts, the drag pressure has to
be determined with care. Move the movable carriage apart
and turn the maximum pressure regulator counter-clock-
wise as far as it will go to have zero pressure in the hydrau-
lic circuit. Then push the carriage mover lever to its close-in
position while simultaneously turning the maximum pres-
sure regulator gradually clockwise. Watch the display and
note the pressure that "drags" the carriage sufficiently to
set it in motion. This is the drag pressure P
The exact drag pressure depends on various condi-
tions (pipe size and material, position of the ma-
chine, etc.) and has to be determined for every
Important
welding individually. The value P
pute the bead build-up, the heating, and the join-
ing pressures needed for jointing (stages t
t
in the welding diagram, respectively).
5
4.4.1
Bead Build-up Stage
Use the welding value tables in the Appendix to look up the
joining pressure (i. e., the maximum pressure that will be
reached during the process, in the bead build-up stage and
at the end of the joining stage) appropriate for your situ-
ation. Then set the maximum pressure regulator to the ap-
propriate pressure while observing the actual pressure dis-
Version November 2022_1
P
5
P
+ P
2
t
t
t
t
2
3
4
for this welding.
t
is needed to com-
t
Weld Control 250 User's Manual
+ P
t
t
t
5
6
, t
, and
1
2
t
27
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