Operation Manual

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A7 MIG Welder© Kemppi Oy 2018 1824
OPERATING MANUAL
4.5.5 Configuring touch tool
The touch tool can be congured from the web user
interface or from the setup panel. The conguration
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 Tool parameter to
congure the touch tool. Select the Welding wire or Gas
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 or Gas
nozzle to force the tool, or Select at robot to let the tool
selection control to the robot. A pop-up bar with Save and
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 Figure 4.23, “Weaving the welding
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.
Figure 4.23 Weaving the welding head during TAST
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 Figure 4.24, “TAST
signal waveform”). The generated signal is equivalent to
the welding current.
Arc length
Time
1 2 3
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 lters 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 eld for the
TAST value and the control signal. See the A7 MIG Welder
Integration guide for more information.
The TAST function is always available in the digital
robot interface and therefor it does not have any
conguration parameters in the web user interface or in the
setup panel.