114
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)
Summary of Contents for RCU 5000i
Page 2: ...2 ...
Page 4: ...4 ...
Page 200: ...200 Backup screen All data from the remote control unit are sa ved onto the memory card ...
Page 202: ...202 Restore screen The last Data screen called up appears ...
Page 207: ...207 EN Machine pre sets MIG MAG screen MIG MAG screen appears ...
Page 210: ...210 Machine pre sets e g MIG MAG screen The last Data screen called up appears ...
Page 242: ...242 ...
Page 243: ...Appendix ...
Page 244: ...244 Spare parts list RCU 5000i ...
Page 245: ...245 ...
Page 246: ...246 ...
Page 247: ...247 ...