2-Step Mode - Fronius TransTig 1750 Puls Operating Instructions Manual

I
S
t
S
t
up
I
1
I
2
t
down
I
E
t
E
SPt
GPr
GPo

2-step mode

-
-
IMPORTANT! To work in 2-step mode after 2-step mode has been selected, the SPt setup
parameter must be set to "OFF" and the special spot welding indicator on the control panel
must not light up.
46
Starting current phase: the temperature is raised gently, at low welding current, so
that the filler metal can be positioned correctly
Starting current time
Upslope phase: the starting current is continuously increased until it reaches the
main current (welding current) I
Main current phase (welding current phase): uniform thermal input into the base
material, whose temperature is raised by the advancing heat
Reduced current phase: intermediate lowering of the welding current in order to
prevent any local overheating of the base material
Downslope phase: the welding current is continuously lowered until it reaches the
end-crater current
End current phase: to prevent any local overheating of the base material due to
heat build-ups towards the end of welding. This eliminates any risk of weld drop-
through.
End current time
Spot welding time
Gas pre-flow time
Gas post-flow time
Welding: pull back and hold the torch trigger
End of welding: release the torch trigger
I
GPr t
up
1
I
1
t
t G-L / G-H
down