65
EN
TIG cold-wire
welding
TIG cold-wire welding is only possible in conjunction with a cold wire- feed unit.
Mode of operation of TIG cold-wire welding at a set pulse frequency when DC welding is
selected:
a) Current waveshape
b) Wire feed speed curve
1)
(1/F-P = time interval between 2 pulses)
Legend:
I
S
Starting current dcY Duty cycle
I
E
Final current I-G Ground current
t
up
Upslope I
1
Main current
t
Down
Downslope F-P Pulse frequency
1)
Fd.1 Wire feed speed 1 Fd.2 Wire feed speed 2
dt1 Delay in the start of wirefeeding
from the beginning of main current
phase I
1
dt2 Delay in the end of wirefeeding
from the end of main current
phase I
1
1/F-P
I
1
I-G
dt2
I
v
D
a)
b)
t
dt1
t
up
t
down
I
S
I
E
Fd.2
Fd.1
t
dcY
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