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Parameters of CMT / pulse characteristics
General
Ignition In CMT processes, the ignition process is generally initiated with SFI (Spatter-Free Igni-
tion). The subsequent ignition behaviour in the CMT process is controlled by the following
parameters:
NOTE! The creation and editing of CMT/pulse characteristics (CMT+P) is a com-
plex task and therefore a core skill of Research & Development. Special meas-
urement technology (e.g. a high-speed camera, oscilloscope, etc.) as well as
extensive background knowledge is required for the creation and editing of
CMT+P characteristics.
The modification of CMT+P characteristics on-site simply optimizes the applica-
tion in question.
vd_ignition
Wire feed speed command value [m/min] before welding begins (-30 - +30)
-30 = backward movement of the wire electrode at 30 m/min
+30 = forward movement of the wire electrode at 30 m/min
I_ignition
Command value for the ignition current [A], set when welding begins. The ignition current
depends on the filler metal and wire diameter.
t_ignition
Length of time [ms] that the parameters Vd_ignition and I_ignition are active when weld-
ing begins.
0 = no ignition current, no wire feed speed
99.98 = max. duration for ignition current and wirefeed speed command value
U_hotstart
Parameter [V] for changing the arc length when welding starts
10 = short arc
40 = long arc
t_hotstart
The length of time [ms] that the change in the arc length is active when welding begins.
0 = no change in the arc length
654.98 = max. duration for the change in arc length
slaghammer On_1/Off_0
Function for removing slag at the end of the wire electrode
The wire electrode carries out a quick forward and reverse movement and touches the
surface of the workpiece until any slag drops off the wire electrode and ignition occurs.
The ignition parameter for aluminium is slaghammer = 0.
The parameter is not displayed for all CMT characteristics.
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