Welbach AMPERO 225 Manuel D'utilisation page 16

EN
• Tee joint
When welding a tee joint, the edges of both details must be melted identically. To obtain this, provide more heat
to the flat surface as the edge melts faster. Use a ceramic nozzle of the size and length of the non-consumable
electrode to obtain the shortest arc possible. The filler metal must be added to the welding puddle at its begin-
ning.
• Corner connection
In case of a corner connection, both edges of the welded elements must melt, and the welding puddle must be
kept in the centre of the connection line. Such a connection requires a convex weld and, thus, a large amount of
filler metal.
5.4 Aluminium welding with TIG method in AC mode
Aluminium welding with the TIG method in AC mode provides better results in the AC alternating current
mode. To start welding, clean the edges of the welded material thoroughly, removing contamination by means of
chemical agents or mechanically. It is preferable to use argon, 5.0 cleanliness class, as the shielding gas. Depending
on the material thickness, select electrode diameters (see table below). It is recommended to use green tip
electrodes for aluminium welding, potentially gold electrodes.
Welding current Electrode diameter
[A] [mm]
20-75 1
25-110 1,6
60-160 2,4
110-225 3,2
160-310 4
240-370 4,8
30
Material thickness
[mm]
0,5-1,0
1,0-2,0
2,0-3,0
3,0-5,0
5,0-8,0
8,0-10,0
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When using the inverter technique, it is possible to apply additional adjustments facilitating welding: AC
current balance and AC frequency. All TIG AC/DC welders have both these adjustments. Balance adjustment is
done by means of CLEAN SCOPE and CLEAN WIDTH parameters (functions no. 10 and 11 on the control
panel - see description in chapter 5) for welders Ampero 225:
CLEAN WIDTH CLEAN
Percentage difference WIDTH = -
of positive time and 40%
negative current
direction in a single
period of welding
current. By default, this
ratio is 50/50 (setting
parameter "0")
CLEAN
WIDTH =
40%
CLEAN SCOPE CLEAN
Percentage difference SCOPE =
of negative and positive 20%
welding current value in
a single period
NOTE: It is
recommended to set
the CLEAN SCOPE
CLEAN
parameter at 0 for
SCOPE =
WELBACH machines
-20%
AC Frequency AC Freq =
Alternating current 50 Hz
mode output current
frequency.
NOTE:
For most works, it
is recommended to
commence work with
frequency of 60Hz, and
then adjust it as needed.
AC Freq =
100 Hz
EN
Narrow weld.
No cleaning effect.
Deep fusion.
Reduces the
electrode rounding
effect.
Wide weld
Visible cleaning
effect.
Shallow fusion.
Clearly rounds the
electrode.
Wide weld
Visible cleaning
effect.
Shallow fusion.
Narrow weld.
No cleaning effect.
Deep fusion.
Dispersed arc.
Wide weld.
Ideal for padding.
More focused arc.
Narrow weld.
Ideal for spandrel
welding.
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