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OPERATION
B-37 B-37
POWER FEED® 25M
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Shielding
Gas
I
dle Preflow Strike Wel
d
Burnback Postflow Idle
WFS
On
Off
Run-in
Off
Weld
Off
Weld
Arc
Established
Trigger
Pulled
Trigger
Released
4 Step Trigger
Start = OFF
Crater = OFF
Burnback = OFF
1.5 se c ma x.
Start
Crater
Power
Source
Output
Crater
Trigger
Pulled
T
r
ig
g
e
r
R
e
l
e
a
s
e
d
FIGURE B.22
EXAMPLE 4 – 4 STEP TRIGGER: Trigger Interlock
The 4 step trigger can be configured as a trigger inter-
lock. Trigger interlock adds to the welder’s comfort
when making long welds by allowing the trigger to be
released after an initial trigger pull. Welding stops when
the trigger is pulled a second time and then released,
or if the arc is interrupted. (See Figure B.22)
For this sequence,
PREFLOW:
Shielding gas begins to flow immediately when the gun
trigger is pulled.
STRIKE:
After preflow time expires, the power source regulates
to the welding output and wire is advanced towards the
work piece at the Strike WFS. If an arc is not estab-
lished within 1.5 seconds, the wire feed speed will jump
to the welding wire feed speed.
WELD:
The power source output and the wire feed speed con-
tinue at the weld settings. Welding continues when the
trigger is pulled a second time.
POSTFLOW:
As soon as the trigger is released for the second time,
the power source output and the wire feed speed are
turned OFF. Shielding gas flows until the post flow
timer expires.