
Version March 2015 EN 9
HÜRNER HWT 160–M User’s Manual
HÜRNER Schweisstechnik GmbH
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
F1. Then engage the locking bar next to the
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 F1on the tag next
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 F2, as previously computed according to the formula on the tag
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 F2
on the tag or in the appendix.
Important
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-
cumference.
5.6 Change-over and Jointing
When the heating stage is completed, loosen the locking bar, turn
thehandwheelbacktoremovethecomponentstobejoinedfrom
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 F2and F5on the tag next to the hand wheel
or in the tables in the appendix.
Immediately after contact is established between the component butts,
thejointingforcehastobereached.Buildingthisforce,bycontinuing
to turn the hand wheel until the force indicator shows the value for
F5, has to be done as a consistent and linear increase. F5is the same
as F1. Accordingly, it is computed, depending on the diameter and
wall thickness, with the help of the same formula given on the tag or
looked up in the tables in the appendix.
Theforceincrease,toreachthejointingforce,mustnottakelonger
than indicated below F5on the tag or in the appendix.
5.7 Cooling Stage
Whenthejointingforceisreached,blockthemovablecarriageofthe
machine at its position using the locking bar, in order for this force to
bekept.Itmustcontinuetobeapplied,whilethejointcoolsdown,
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.