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Effects of an excessively high base current:
- wire electrode welded on too hard
- large drops form
Effects of an excessively low base current:
- ionisation of the arc section too low
- Arc breaks in the base current phase
Pulsing current
The height of the pulsing current [A] depends in the first instance on the material and di-
ameter of the wire electrode, as well as the shielding gas used. A certain energy limit (=
critical limit) must be reached for droplet detachment to occur, and thereby ensure material
transfer without a short circuit. The pulsing current must remain above the critical limit.
Effects of an excessively high pulsing current:
- Droplet detachment energy too high
- Spatter with small droplets
Effects of an excessively low pulsing current:
- Droplet detachment energy too low
- Spatter with large droplets
Pulsing current time
The duration of the pulse phase [ms] depends essentially on the material and diameter of
the wire electrode as well as the shielding gas used. The lower the pulsing current and/or
the greater the diameter of the wire electrode, the longer the selected pulse time must be
in order to permit a short-circuit-free material transfer.
Effects of an excessively high pulse time:
- High energy supply means fine spatter
Effects of an excessively low pulse time:
- Poor droplet detachment, and therefore heavy spatter
Ground current
The function of the base current [A] is to maintain the arc during the pause between the
pulses (= base current phase).
Current rise when pulsing begins
The parameter [A/ms] describes the linear rise of the current when pulsing begins, e.g.
0 = no current rise
100 = soft arc
1000 = max. rise in current (hard arc)
Current-rise (tau)
Time of transition [ms] from a linear slope to the pulsing current (0 - 5)
0 = hard transition, loud arc noise
5 = soft transition, softer arc noise
Current drop when pulsing ends
The parameter [A/ms] describes the linear current drop when pulsing ends, e.g.
0 = no current decrease
100 = soft arc
1000 = maximum current drop (hard arc)
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