REHM TIGER 180 AC/DC ULTRA, Operating Instructions Manual

Page: 26 / 68

Function description
26
Peculiarities:
to the 2nd cycle Actuating the torch trigger a second time during slope-up of
the current extinguishes the arc and the protective gas
continues to flow according to the selected gas post-flow time.
to the 3rd Cycle The arc can be switched off during the slope-down period.
Releasing the torch trigger before reaching the end crater
current extinguishes the arc and the protective gas continues
to flow for the set post flow time.
4.7.2 2 cycle operating mode
The 2 cycle mode is recommended for fast, controlled tacking and manual spot
welding.

1st cycle: Actuate the torch trigger
The protective gas solenoid valve opens
After the set gas pre-flow time has expired the arc is ignited
The welding current automatically adjusts to the selected slope-up time, starting
from the set starting current and rising to the preselected value for I
1
.

2nd cycle: Release the torch trigger
The current reduces to the set end crater value at the preselected current slope-
down time and then automatically switches off.
The inert gas flow is according to the selected gas post-flow value.
Fig. 9: Process for 2 cycle welding
Peculiarities:
to the 2nd cycle
Actuating the torch trigger a second time during slope-down
of the welding current jumps the welding current back to I
1
.
This process is also known as manual pulsing (see Section
4.6.10). Actuating the torch trigger 2 (BT2) extinguishes the
arc.
Gas valve
Welding current
Torch trigger 1
t
t
t