73
EN
Description of TIG operating modes
Symbols and
their explanations
2-step mode
Place the tungsten electrode onto the workpiece and then pull the torch trigger back
and hold => shielding gas flows
Raise the tungsten electrode => arc ignites
Release torch trigger => end of welding
Pull back and hold the
torch trigger
Release the torch trigger
forwards
Push forward and hold
the torch trigger
Release the torch trigger
backwards
GPr
Gas pre-flow time
GPo
Gas post-flow time
I-S
Starting-current phase: the temperature is
raised gently at low welding current, so
that the filler metal can be positioned cor-
rectly
I-E
Final current phase: to prevent crater
cracks or cavitations
t
S
Starting current duration
t
E
Final current duration
t
up
UpSlope phase: the welding current is
continually increased
Duration: 0.5 seconds
t
down
DownSlope phase: the welding current is
continuously reduced
Duration: 0.5 seconds
I-1
Main current phase (welding current
phase): uniform thermal input into the
base material, whose temperature is
raised by the advancing heat
I-2
Reduced current phase: intermediate low-
ering of the welding current in order to pre-
vent any local overheating of the base
material
I
t
I-1
GPo
1 2 3
tdowntup
1
2
3
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