Heating Stage; Change-Over And Jointing; Cooling Stage - Hürner HWT 160-M Manuel Utilisateur

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
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Continue turning the hand wheel until the
force indicator on the right-hand side of the
machine indicates the force level valid for
F . Then engage the locking bar next to the
1
hand wheel to lock the movable carriage of
the machine in this position.
The bead build-up stage is completed when
the weld bead that is forming reaches the
height, which depends upon the wall thick-
ness (S), indicated below F
to the hand wheel (see photograph below)
or in the tables in the appendix.
5.5

Heating Stage

At the end of the bead build-up stage, the force must be reduced
to F , as previously computed according to the formula on the tag
2
next to the hand wheel (see photograph above) or looked up in the
appendix. To do this, unlock the locking bar next to the hand wheel,
turn the wheel in the opposite direction, and re-engage the locking
bar to block the carriage in this position.
The force thus set has to be constantly applied in the heating stage. The
heating stage is completed after the duration that is indicated below F
on the tag or in the appendix.
Despite the reduced force, the contact of the components
and the heating element must be ensured throughout this
stage. It must not be lost anywhere on the compoment cir-
Important
cumference.
5.6

Change-over and Jointing

When the heating stage is completed, loosen the locking bar, turn
the hand wheel back to remove the components to be joined from
the heating element, tilt the heating element away from in-between
them and bring the components in contact with each other using the
hand wheel.
The longest acceptable duration for this process is the one indicated
in the column between F
or in the tables in the appendix.
Immediately after contact is established between the component butts,
the jointing force has to be reached. Building this force, by continuing
to turn the hand wheel until the force indicator shows the value for
F , has to be done as a consistent and linear increase. F
5
as F . Accordingly, it is computed, depending on the diameter and
1
wall thickness, with the help of the same formula given on the tag or
looked up in the tables in the appendix.
The force increase, to reach the jointing force, must not take longer
than indicated below F
5.7

Cooling Stage

When the jointing force is reached, block the movable carriage of the
machine at its position using the locking bar, in order for this force to
be kept. It must continue to be applied, while the joint cools down,
for as many minutes as indicated in the rightmost column of the tag
next to the hand wheel or in the appendix. Like all other durations,
it depends on the wall thickness.
Version January 2018
on the tag next
1
and F on the tag next to the hand wheel
2 5
on the tag or in the appendix.
5
HÜRNER HWT 160–M User's Manual
2
is the same
5
9
EN