ESAB Aristo U6 User manual

Aristo®
Instruction manual
0459 287 501 US 20170331 Valid for: from program version 2.14P
U6

TABLE OF CONTENTS
0459 287 501 © ESAB AB 2017
1INTRODUCTION............................................................................................ 4
1.1 Do this first................................................................................................ 4
1.2 The control panel's working method...................................................... 4
1.3 Control panel ............................................................................................ 5
1.4 Symbols in the display ............................................................................ 6
1.5 Update of software ................................................................................... 6
2MENUS .......................................................................................................... 7
2.1 The main menu and the measurements menu ...................................... 7
2.2 The selection menu .................................................................................. 7
3MIG/MAG WELDING ..................................................................................... 8
3.1 Settings ..................................................................................................... 8
3.2 Explanation of functions.......................................................................... 10
4TIG WELDING................................................................................................ 15
4.1 Overview ................................................................................................... 15
4.2 Settings ..................................................................................................... 15
4.3 Explanation of functions.......................................................................... 16
5MMA WELDING............................................................................................. 21
5.1 Settings ..................................................................................................... 21
6ARC-AIR GOUGING...................................................................................... 23
6.1 Settings ..................................................................................................... 23
7GENERAL FUNCTIONS ................................................................................ 24
7.1 Remote control unit.................................................................................. 24
7.2 Settings ..................................................................................................... 24
8MEMORY MANAGEMENT ............................................................................ 25
8.1 Store welding data.................................................................................... 25
8.2 Recall welding data .................................................................................. 26
8.3 Delete welding data .................................................................................. 27
9LOCK CODE.................................................................................................. 28
10 FAULT CODES .............................................................................................. 29
10.1 General ...................................................................................................... 29
10.2 List of fault codes..................................................................................... 29
10.3 Fault code descriptions ........................................................................... 30
11 ORDERING SPARE PARTS .......................................................................... 35
DIAGRAM ............................................................................................................. 36
WIRE AND GAS DIMENSIONS............................................................................ 37
MENU STRUCTURE............................................................................................. 39

TABLE OF CONTENTS
0459 287 501 © ESAB AB 2017
ORDERING NUMBERS........................................................................................ 46
Rights reserved to alter specifications without notice.

1 INTRODUCTION
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1 INTRODUCTION
This manual describes the operation of the U6 control panel.
For general information on operation, see the wire feed unit and power source operating
instructions.
1.1 Do this first
This menu appears on the display the first time you start the power unit.
When delivered, the control panel and display are set to English. There are 14 languages
stored in the control panel: to change to the one you want, do as follows.
Press to reach the first selection menu.
Press to reach the configuration menu.
Press (the soft button on the right beneath the display) until the correct language is
shown in the display.
1.2 The control panel's working method
The control panel can be said to comprise two units: the primary memory and the welding
data memory.

1 INTRODUCTION
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In the primary memory, a complete set of welding data settings are created, which can be
stored in the welding data memory.
When welding, the process is always controlled by the content of the primary memory. For
this reason, it is also possible to recall welding data settings from the welding data memory
to the primary memory.
Note, the primary memory always contains the most recently set of welding data settings.
These can be recalled from the welding data memory or individually altered settings. In other
words, the primary memory is never empty or “reset”.
1.3 Control panel
1. Display
2. Knob for setting the voltage
3. Knob for setting the wire feed speed and
current
4. Soft pushbuttons (function keys), see
further explanation below
5. MENU button
Soft pushbuttons
The functions of these buttons (i.e. what each one does) change, depending on the
sub-menu shown in the display. The particular function for each button is shown by the text,
in the bottom line of the display, corresponding to the buttons. (A white dot beside the text
indicates that the button is active.)
When the text in this manual advises you to press a button of this type , the intention
is that you should press the function key beneath the relevant display text.
MENU pushbutton
This pushbutton brings you to the selection menu (see item <>), if you are in the main menu.
If you are in some other menu, it moves you back up one menu.

1 INTRODUCTION
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1.4 Symbols in the display
Back to the main menu.
Move the cursor down to a new setting parameter.
Change the function in the selected line.
Increase the value.
Decrease the value.
1.5 Update of software
If this warning is shown in the display, it means that the power source doesn’t support this
function.
Contact an authorized ESAB service engineer to obtain updated software.

2 MENUS
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2 MENUS
The control panel uses several different menus: the main menu, the measurements menu,
the selection menu, the process menu, the settings menu, the configuration menu and the
memory menu. A startup display is also shown on startup, with information on the type of
panel and the software version in use.
2.1 The main menu and the measurements menu
The main menu always appears immediately after
startup, showing the current set values. If you are in
the main menu when you start to weld, the menu
changes automatically to show the measured values
(the measurements menu). The measured values
remain on the display even after welding stops.
Other menus can be accessed without losing the measured values.
The set values are only displayed, instead of the measured values, when a knob is turned,
or the welding method changed.
2.2 The selection menu
Use the selection menu to select the next menu level
you want to go to: process, settings, configuration, or
memory.
The process menu The settings menu
Use this menu to
change the welding
process, material
type, etc.
Use this menu to set
welding parameters,
such as gas preflow,
hot start time, crater
fill time, etc.
The configuration
menu
The memory menu
Use this menu to
change the language,
measurements units,
etc.
Use this menu to
store, recall and/or
erase various stored
welding data settings.
There are ten storage
positions for welding
data.

3 MIG/MAG WELDING
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3 MIG/MAG WELDING
The arc in MIG/MAG welding melts a filler wire (the electrode), which is continuously fed into
the weld, with the molten zone being protected by a shielding gas.
Pulsing the current affects the transfer of molten droplets from the wire , to produce a stable,
spatter-free arc even at low welding data.
3.1 Settings
MIG/MAG welding without pulsing
Settings Setting range In steps of Default setting
2/4-stroke 1) 2-stroke or 4-stroke - 2-stroke
Crater filling OFF or ON - OFF
Crater fill time 0 - 5 s 0.1 s 1.0 s
Hot start OFF or ON - OFF
Hot start time 0.0 - 10.0 s 0.1 s 1.5 s
Creep start OFF or ON - ON
Gas purging 1) ---
Cold wire feed - - -
QSet OFF or ON - OFF
Synergy OFF or ON - ON 2)
Display of amperage
estimate
OFF or ON - OFF
Inductance 0 - 100 1 70
Gas pre-flow 0.1 - 25 s 0.1 s 0.1 s
Burnback time 3) 0 - 0.35 s 0.01 s 0.08 s
SCT SYN, OFF, ON - SYN
Start parameter R 8.0 - 60.0 0.25 -
Gas post-flow 0.1 - 20 s 1 s 1 s
Spot welding OFF or ON - OFF
Spot welding time 0.1 - 25 s 0.1 s 0.1 s
Voltage 8 - 60 0.25 (displayed to one
decimal)
synergy deviation ±0
Wire feed speed 0.8 - 25.0 m/min 0.33 ft./min (0.1 m) 5 m/min
Trigger data OFF, ON or ARC OFF - OFF
Dimensions METRIC or INCH - METRIC
Panel enable OFF or ON - ON
Automatic save OFF or ON - OFF
AVC feeder OFF or ON - OFF
Limits OFF or ON - OFF
Lock code OFF or ON - OFF
1)These functions cannot be changed while welding is in progress.
2) The synergy line on delivery: solid wire (ER70S), shielding gas CO2with wire 0.8 mm.

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3) The burnback time setting is only available when SCT is OFF. This will be the case if SCT
setting = OFF, or SCT setting = SYN and the chosen synergic line has SCT set to OFF.
MIG/MAG welding with pulsing
Settings Setting range In steps of Default setting
2/4-stroke 1) 2-stroke or 4-stroke - 2-stroke
Crater filling OFF or ON - OFF
Crater fill time 0 - 5 s 0.1 s 1.0 s
Hot start OFF or ON - OFF
Hot start time 0.0 - 10.0 s 0.1 s 1.5 s
Creep start OFF or ON - ON
Gas purging 1) ---
Cold wire feed - - -
Display of amperage
estimate
OFF or ON - OFF
Gas pre-flow 0.1 - 25 s 0.1 s 0.1 s
Burnback time 2) 0 - 0.35 s 0.01 s 0.08 s
SCT 3) SYN, OFF, ON - SYN
Gas post-flow 0 - 20 s 1 s 1 s
Spot welding OFF or ON - OFF
Spot welding time 0.1 - 25 s 0.1 s 0.1 s
Voltage 8 - 60 0.25 (displayed to one
decimal)
synergy deviation ±0
Wire feed speed 0.8 - 25.0 m/min 0.33 ft./min (0.1 m) 5 m/min
Trigger data OFF, ON or ARC OFF - DISABLE
Dimensions METRIC or INCH - METRIC
Panel enable OFF or ON - ON
Automatic save OFF or ON - OFF
AVC feeder OFF or ON - OFF
Limits OFF or ON - OFF
Lock code OFF or ON - OFF
Pinch-off / final pulse
2)
0 - 100 % 1 %
1) These functions cannot be changed while welding is in progress.
2) Only possible to set if SCT is off
3) The burnback time setting is only available when SCT is OFF. This will be the case if SCT
setting = OFF, or SCT setting = SYN and the chosen synergic line has SCT set to OFF.

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3.2 Explanation of functions
2-stroke
2-stroke operation of the welding torch switch button
A = Gas pre-flow B = Hot start C = Welding D = Crater fill E = Gas post-flow
In the 2-stroke control mode, pressing the welding torch trigger switch starts the gas preflow
(if used) (1) and strikes the arc. Releasing the trigger switch (2), starts crater filling (if in
operation), extinguishes the arc and starts the gas postflow (if in operation).
TIP: If the welding torch trigger switch is pressed again during the crater fill time, welding can
be continued for as long as required (shown by the dotted line) using the crater fill data.
Crater filling can also be interrupted by quickly pressing and releasing the trigger switch while
crater filling is in progress.
- Activating 2-stroke from the main menu.
4-stroke
Function when using 4-stroke control of the welding torch
A = Gas pre-flow B = Hot start C = Welding D = Crater fill E = Gas post-flow
In the 4-stroke control mode, pressing the welding torch trigger switch starts the gas preflow
(1). Releasing the trigger switch (2) starts the welding process. At the end of welding, the
welder presses the trigger switch again (3), which starts crater filling (if in operation) and
reduces the welding data to a lower value. Releasing the trigger switch again (4)
extinguishes the arc and starts the gas postflow (if used).

3 MIG/MAG WELDING
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TIP: Crater filling stops, when the trigger switch is released. Keeping the button pressed
continues the welding at the lower data of the crater filling function (dotted line).
- Activating 4-stroke from the main menu.
Crater filling
Crater filling helps to avoid pores, thermal cracking, and crater formation in the workpiece at
the end of the weld.
- Setting the crater filling time from the settings menu.
Hot start
The hot start function increases the welding current for an adjustable time at the start of
welding, which reduces the risk of poor fusion at the start of the weld.
- Setting of hot start time performed in the settings menu.
Creep start
The creep start function reduces the initial feed speed of the wire to 50% of the set speed,
until the wire contacts the workpiece.
- Activating creep start from the main menu.
Gas purging
The gas purging function is used when measuring the gas flow rate, or to purge the gas
hoses of any air or moisture before starting to weld. It continues for as long as the button is
kept pressed down, and prevents a voltage from being applied and the wire feed from
starting.
- Activating gas purging from the main menu.
Cold wire feed (Wire inching)
Cold wire feed is used to feed out wire without energizing the arc. The wire is fed out for as
long as the button is kept pressed in.
- Activating cold wire feed from the main menu.
QSet™
QSet™ is used to make it easier to set the welding parameters.
• Turning the knob clockwise increases (+) the arc length.
• Turning the knob counterclockwise reduces (-) the arc length.
SHORT ARC
Initially, when starting to weld with a wire type/gas type, QSet™ automatically sets all of the
necessary welding parameters. Once this is done, QSet™ stores all the data to produce a
good weld. The voltage then automatically conforms to changes in the wire feed speed.
SPRAY ARC
When approaching the spray arc area, the value for QSet™ must be increased. Disengage
the QSet™ function when welding with pure spray arc. All the settings are inherited from
QSet™, with the exception of the voltage, which must be set.
Recommendation: First, make a weld (6 seconds) with QSet™ on a test piece, to obtain all
the correct data.

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NOTE!
The QSet function and the synergy function
cannot be activated at the same time.
- Activating QSet from the process menu.
Synergy
Every combination of wire type, wire diameter, and gas mixture requires a unique relationship
between the wire feed speed and voltage (arc length) to ensure a stable arc. The voltage
(arc length) is automatically controlled in accordance with the preprogrammed synergy line
that has been selected by the welder, which makes it much easier to quickly find the optimum
welding parameters. The relationship between the wire feed speed and the other parameters
is referred to as the synergy characteristic or synergy line.
Synergy ON: the main menu shows the set wire feed,
as well as positive and negative deviations from the
synergy line's voltage.
Positive deviations are displayed with a bar above SYN,
negative ones are displayed below.
Synergy OFF: the main menu shows the set value for voltage and wire feed.
- Activating synergy from the process menu.
Synergy line package
The synergy line package supplied with the machine is called “Standard synergic lines”.
It is also possible to order other synergy line packages, but these must be installed by an
authorized ESAB service engineer.

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Display of amperage estimate
Given the chosen synergic line an amperage estimate is calculated using the current wire
feed speed. The setting is adjusted in the main menu, using soft key AMP.
The amperage estimate is displayed as a reference when the welder does not know what
wire feed speed to set. Depending on joint type and the stick out (contact tip to work piece
distance) that is used, there will be some deviation between amperage estimate and the
actual measured amperage. Large deviation might mean that stick out should be adjusted
for optimal weld results.
The amperage estimate is presented in the main menu when the wire feed speed or the
voltage is adjusted. The row showing wire feed speed in the display is replaced with
amperage estimate. During and after welding the welding current measure values are
displayed on the same row.
Inductance
Higher inductance produces a more flowing weld and less spatter. Lower inductance
produces a harsher sound and a stable, concentrated arc.
- Setting the inductance from the settings menu.
Gas pre-flow
The gas preflow time is the time during which the shielding gas flows before the arc is struck.
- Setting the gas preflow time from the settings menu.
Burnback time
The burnback time is a delay between when the wire feed unit starts to brake the wire until
the power unit shuts off the welding current. Too short of a burnback time leaves a long piece
of filler wire projecting after welding has stopped, with the resulting risk of the wire freezing
into the solidifying weld pool. On the other hand, too long of a burnback time reduces the
stickout to such an extent that there is a risk of the arc striking from the welding torch contact
tip when welding is started the next time.
- Setting the burnback time from the settings menu. The burnback time setting is only
available when SCT is OFF. This will be the case if SCT setting = 1, or SCT setting = 0 and
the chosen synergic line has SCT set to OFF.
SCT
SCT is a function that gives small repeated short circuits at the end of the welding until the
wire feeding has totally stopped and the contact with the workpiece has been broken.
The following settings exist: SYN = The value (ON/OFF) is determined by the synergy line
(default option).

3 MIG/MAG WELDING
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OFF = SCT is OFF
ON = SCT is ON
Start parameter R
Start parameter R enables fine-tuning of the electric arc during the start moment when
welding. The parameter can be set from 8.0 to 60.0, in steps of 0.25. Synergy must be OFF
for this parameter to be available (which means that the chosen method is Short Arc).
Gas post-flow
The gas postflow function controls the time during which shielding gas continues to flow after
the arc has been extinguished.
- Setting the gas postflow time from the settings menu.
Changing trigger data
Using this function, it is possible to toggle between different pre-set welding data alternatives
by double-clicking on the welding blowpipe's trigger.
Toggling takes place between the memory positions 1, 2 and 3, see the “MEMORY
MANAGEMENT”. If there is no data in memory position 2, toggling takes place between
positions 1 and 3 instead.
ON - Toggling between memory positions can take place before,after, or during welding.
ARC OFF - Toggling between memory positions can only take place before or after welding.
- Activating trigger data toggling from the configuration menu.
AVC feeder
When this function is activated, it is possible to use an Arc Voltage Controlled or Off-The-Arc
feeder, where the arc voltage from the power source is used to power the feed unit.
- Activating AVC feeder from the process menu.
Spot welding
Select Spot welding when you want to “spot-weld” thin sheet metal.
- Activation and setting of Spot welding is performed in the settings menu.
Voltage
A higher voltage gives a longer arc, with a hotter and wider weld pool.
Irrespective of which menu is displayed, the set value for the voltage can always be
changed. The value is displayed in the main menu or selection menu.
Wire feed speed
The wire feed speed is the speed at which the filler wire is supplied, measured in m/min.
Irrespective of which menu is displayed, the set value for the wire feed speed can always be
changed. The value is displayed in the main menu or selection menu.
Pinch-off / final pulse
Pinch-off pulse is applied to ensure that a ball is not formed on the wire when welding stops.
Applies to MIG/MAG welding with short/spray arc and short pulsing. When pulsing,
completion is synchronized with a pulse, finishing pulse, which can be set between 0% and
100%.

4 TIG WELDING
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4 TIG WELDING
4.1 Overview
TIG welding uses a non-melting tungsten electrode from which the arc is struck that melts
the workpiece. The molten weld pool and the tungsten electrode are protected by a shielding
gas.
Pulsing is used, to give better control of the weld pool and solidification. The pulse frequency
is sufficiently low to allow some of the weld pool to start to solidify between each pulse.
Pulsing has four controllable parameters: pulse duration, background current time, pulse
current, and background current.
4.2 Settings
TIG welding without pulsing
Settings Setting range In steps of Default setting
2/4-stroke 1) 2-stroke or 4-stroke - 2-stroke
HF / Liftarc HF or Liftarc - HF
Live TIG-start 2) ---
Gas purging 1) ---
Gas pre-flow 0 - 5 s 0,1 s 0,5 s
“Slope up” time 0 - 5 s 0,1 s 0,0 s
”Slope down” time 0 - 10 s 0,1 s 2,0 s
Gas post-flow 0 - 25 s 0,1 s 5,0 s
Current 2) 4 - 500 A 1 A 100 A
Trigger data OFF, ON or ARC OFF - DISABLE
Dimensions METRIC or INCH - METRIC
Panel enable OFF or ON - ON
Automatic save OFF or ON - OFF
Limits OFF or ON - OFF
Lock code OFF or ON - OFF
Min. current 0 - 99% 1% 0%
VRD - - -
1) These functions cannot be changed while welding is in progress.
2) Live TIG-start/Maximal current depends on the machine type is used.
TIG welding with pulsing
Settings Setting range In steps of Default setting
2/4-stroke 1) 2-stroke or 4-stroke - 2-stroke
HF / Liftarc HF or Liftarc - HF
Gas purging 1) 0 - 5 s 0,1 s 0,5 s
Gas pre-flow 0 - 5 s 0,1 s 0,5 s
“Slope up” time 0 - 5 s 0,1 s 0,0 s
”Slope down” time 0 - 5 s 0,1 s 2,0 s

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Settings Setting range In steps of Default setting
Gas post-flow 0 - 25 s 0,1 s 5,0 s
Pulse duration 0.001 - 0.1 s
0.1 - 5 s
0.001 s
0.1 s
0,100 s
Background duration 0.001 - 0.1 s
0.1 -1 s
0.001 s
0.1 s
0,200 s
Pulse current 2) 4 - 500 A 1 A 100 A
Background current2) 4 - 500 A 1 A 25 A
Trigger data OFF, ON or ARC OFF - DISABLE
Dimensions METRIC or INCH - METRIC
Panel enable OFF or ON - ON
Automatic save OFF or ON - OFF
Limits OFF or ON - OFF
Lock code OFF or ON - OFF
Min. current 0 - 99% 1% 0%
1) These functions cannot be changed while welding is in progress.
2) The maximum current depends on the machine type used.
4.3 Explanation of functions
2-Stroke
2-stroke operation of the welding torch switch button.
A = Gas pre-flow B = Slope up C = Slope down D = Gas post-flow
In the 2-stroke control mode, pressing the welding torch switch button starts the gas preflow
(if used) and strikes the arc (1). The current rises to the set value (as controlled by the “slope
up” function, if in operation). Releasing the switch button (2) reduces the current (or starts
“slope down” if in operation) and extinguishes the arc. Gas postflow follows, if it is in
operation.
- Activating 2-stroke from the main menu.

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4-Stroke
4-stroke operation of the welding torch switch button.
A = Gas pre-flow B = Slope up C = Slope down D = Gas post-flow
4-stroke operation of the welding torch switch button.
In the 4-stroke control mode, pressing the switch button starts the gas preflow (if used) (1).
At the end of the gas preflow time, the current rises to the pilot level (a few ampere), and the
arc is struck. Releasing the switch button (2) increases the current to the set value (with
“slope up”, if in use). At the end of welding, the welder presses the switch button again (3),
which reduces the current to the pilot level again (with “slope down”, if in use). Releasing the
switch button again (4) extinguishes the arc and starts the gas postflow (if used).
- Activating 4-stroke from the main menu.
HF
The HF function strikes the arc, by a spark produced when the tungsten electrode is brought
to within a given distance from the workpiece.
- Activating HF from the process menu.
LiftArc
The LiftArc function strikes the arc when the electrode is brought into contact with the
workpiece and then lifted away from it.
Striking the arc with the LiftArc™ function:
1. The electrode is touched on to the workpiece.
2. The trigger switch is pressed, and a low current starts to flow.
3. The welder lifts the electrode from the workpiece: the arc strikes, and the current
rises automatically to the set value.

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”Live TIG-start”
With “Live TIG start”, the arc strikes when the tungsten electrode is brought into contact with
the workpiece and then lifted away from it.
- Activating “Live TIG-start” from the process menu.
Gas purging
Gas purging is used when measuring the gas flow or to flush any air or moisture from the gas
hoses before welding starts. Gas purging takes place for as long as the button is held
depressed and takes place without voltage or wire feed starting.
- Gas purging from the main menu.
Gas pre-flow
This controls the time during which the shielding gas flows before the arc is struck.
- Setting the gas preflow time from the settings menu.
Slope up
The slope up function means that, when the TIG arc strikes, the current rises slowly to the
set value. This provides a gentler heating of the electrode, and gives the welder a chance to
position the electrode properly before the set welding current is reached.
- The setting of slope up time performed in the settings menu.
Slope down
The slope down function in TIG welding is used to avoid the formation of crate cracking at
the end of welding. It reduces the current slowly over an adjustable period of time.
- The setting of slope down time performed in the settings menu.
Gas post-flow
This controls the time during which the shielding gas flows after the arc is extinguished.
- Setting the gas postflow time from the settings menu.
Pulse duration
This is the length of time during which the pulse current is on during a pulse cycle.
- Setting the pulse duration time from the settings menu.
Background time
This is the length of time during which the background current flows. Together with the pulse
duration time, it gives the total pulse cycle time.
- Setting the background time from the settings menu.
Background current
This is the lower current value of the two currents used in pulsed current welding.

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- Setting the background current from the settings menu.
Pulse current
This is the higher current value of the two currents used in pulsed current welding.
Irrespective of which menu is displayed, the set value for the pulse current can always be
changed. The value is displayed in the main menu, the selection menu or the settings menu.
TIG welding with pulsing.
A = Current B = Time C = Background time
D = Background E = Pulse time F = Pulse current
Current
Higher currents produce wider and deeper penetration into the workpiece.
Irrespective of which menu is displayed, the set value for the current can always be changed.
The value is displayed in the main menu or selection menu.
Change of trigger data
Using this function, it is possible to toggle between different pre-set welding data alternatives
by double-clicking on the welding blowpipe's trigger.
Toggling takes place between the memory positions 1, 2 and 3, see the “MEMORY
MANAGEMENT” chapter. If there is no data in memory position 2, toggling takes place
between positions 1 and 3 instead.
ON - Toggling between memory positions can take place before,after, or during welding.
ARC OFF - Toggling between memory positions can only take place before or after welding.
- Activating trigger data toggling from the configuration menu.
Min current (Remote min)
Used to set the minimum current for the remote control. If the max current is 100 A and the
min current is to be 50 A, set the min current to 50%. If the max. current is 100 A and the
min. current is 90 A, set the min. current to 90%.
- Activating min current from the settings menu.

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VRD (Voltage Reduction Device)
The VRD function ensures that the open-circuit voltage does not exceed 35 V when welding
is not being carried out. This is indicated when the VRD icon is visible displayed, see
picture.
The VRD function is blocked when the system senses that welding has started.
If the VRD function is activated and the open-circuit voltage exceeds the 35 V limit, this is
indicated by an error message (16) appearing in the display and welding cannot be started
while the error message is displayed.
The VRD icon
NOTE!
The VRD function works for power sources where it is implemented.