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4.5.5 Configuring touch tool
The touch tool can be configured from the web user
interface or from the setup panel. The configuration
requires
administrator
privileges. The touch tool can be
forced either to the gas nozzle or the welding wire, or left
to be controlled by the robot via the digital robot interface.
Setup panel
Go to the
Main menu > Robot menu > Touch sensor
menu
and turn the control knob on the
configure the touch tool. Select the
Welding wire
nozzle
to force the tool, or
USER
to let the tool selection
control to the robot. Press the
Save
button to save the
settings.
Web user interface
Go to the
Welding settings > System settings > Touch
sensor settings
and select the touch tool by clicking one
of the
Touch tool
buttons. Select the
Welding wire
nozzle
to force the tool, or
Select at robot
selection control to the robot. A pop-up bar with
Reset changes
buttons will appear at the bottom. Press
the
Save
button in the dialog to save the settings.
4.6 Through Arc Seam Tracking (TAST)
Through-Arc Seam Tracking (TAST) is used in arc welding
for following a welding groove automatically by weaving
the welding head (see
head during
TAST") and measuring the arc length. The
seam tracking provides precise welds in setups where the
workpiece position within repetitive tasks varies, or when
the route of the groove is complicated.
Tool
parameter to
or
Gas
or
Gas
Figure 4.23 Weaving the welding head during TAST
to let the tool
Save
and
The arc length depends on the wire tip distance from the
middle of the groove. Weaving the welding head between
the edges of the groove generates a signal that is directly
proportional to the arc length (see
signal
waveform"). The generated signal is equivalent to
the welding current.
© Kemppi Oy 2017
Figure 4.23, "Weaving the welding
Figure 4.24, "TAST
45
A7 MIG Welder
1
2
Ti me
Figure 4.24 TAST signal waveform
1.
Short arc (edge)
2.
Long arc (middle)
3.
Short arc (opposite edge)
The welding power source measures welding current as a
contiguous value during welding. It filters the raw current
value to generate a stable signal for the TAST. The TAST
signal is valid for all MIG/MAG processes including Pulse
MIG and Double Pulse MIG.
The TAST signal is passed to a welding robot as a numeric
value using the digital robot interface. Using the TAST
requires use of certain I/O tables containing a field for the
TAST value and the control signal. See the
Integration guide
for more information.
The TAST function is always available in the digital
robot interface and therefor it does not have any
configuration parameters in the web user interface or in the
setup panel.
3
A7 MIG Welder
1735
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