Facing Component Butts; Checking Component Alignment; Bead Build-Up Stage - Hürner HWT 160-M Manuel Utilisateur

The butt-welding machine is de-
signed exclusively for use with
the supplied heating element.
Important
The use of any other heating ele-
ment puts the welding operation
at risk of yielding a poor outcome
and will in all cases dispense the
manufacturer from assuming any
liability or responsibility for the
product.
Segmented-bend joints are ac-
ceptable only with a 15 degree angle (positioning bolts of
each clamp properly placed at the opposite ends of its slots).
Important
If other positions of the bolts in the slots are used, to experi-
ment with other angles between the components, this will
dispense the manufacturer from assuming any responsibility
for the proper welding outcome and any liability in case of
bodily injury or material damage.
As a preparation to the welding process and prior to it, the applicable
welding forces F have to be computed or looked up in the tables in
the appendix (see Sect. 5.4 ff. below).
The heating element enables manual temperature control. The tem-
perature required for the welding operation can be set with the turn-
ing selector based on the provided scale. As long as the red indicator
light is on, the heating element is heating to the nominal temperature.
When the green indicator light lights up and the red one goes off, this
temperature has been reached and welding can be started.
5.2

Facing Component Butts

Place the facing tool between the component butts, position its front
support around the shaft, and start it. Then use the hand wheel to
move the movable carriage of the machine in on the fixed carriage,
in order for the facing tool to work both component butts.
Facing is properly completed when a continuous blade of material is
cut from both component butts.
Do not put your hand into the operating area of the facing
tool while facing is in progress and remove shavings only
Caution
after the facing tool stops.
5.3

Checking Component Alignment

After facing, verify once again that the alignment of the components
is correct and that any gap is within tolerance. Re-clamp them if
needed.
5.4

Bead Build-up Stage

Insert the hot heating element between the two components to be
joined and close both of them in on it using the hand wheel.
During the bead build-up, the force F
is dependent upon the diameter (D) and the wall thickness (S) of the
component to be welded, and has to be looked up in the tables in the
appendix or computed according to the formula given for the force F
on the tag next to the hand wheel (see photograph next page).
8
EN
has to be applied. This force
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HÜRNER HWT 160–M 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
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Clamp Positioning Bolts
1
Version January 2018