Fronius CMT Twin - Single-Wire Welding; Special Features and Advantages; Material Transfer

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Single-wire welding
Special features
and advantages
A signal is emitted from the robot control that triggers welding from one power source only
(single-wire welding). Depending on the position of the torch neck or the out-of-position
weld seam, single-wire welding can be performed from either the lead or trail power
source. The second power source is paused.
Material transfer
Pulse (single-wire, lead power source): Welding cur-
rent/time curve and schematic representation of the
material transfer
Standard (single-wire, lead power source): Welding
current/time curve and schematic representation of
the material transfer
NOTE! If using FK 4000 R cooling units, both units must be switched to continu-
ous operation in order to perform single-wire welding:
Parameter C-C (Cooling unit Control) = "On" on power source "1" and power
source "2".
NOTE! To ensure a full gas shield during single-wire welding, the solenoid valve
on the paused power source must be open.
In systems using Twin interfaces, the solenoid valve is actuated from the robot
control. For standard interfaces and fieldbus systems, the solenoid valve must be
actuated directly.
Pulse/standard
Symbol
Trail wire electrode
Lead wire electrode
Pulsed arc with droplet transfer
Standard arc
I
L
Welding current of lead power source
I
T
Welding current of trail power source
Welding direction
t (s)
I (A)
I
L
I
T
= 0
t (s)
I (A)
I
L
I
T
= 0