PIPEFAB™ WELDING SYSTEM
OPERATION
B-30
Example 2: 2-Step Trigger: Improved Arc Start and Arc End.
Tailoring the arc start and arc end is a common method for reducing spa
�e
r and improving weld quality.
This can be accomplished with the Start and Burnback func
�
ons set to a desired values and Crater set to
OFF.
For this sequence,
PREFLOW:
Shielding gas begins to
fl
ow immediately when the gun trigger is pulled.
RUN-IN:
A
�e
r pre
fl
ow
�
me expires, the power source regulates to the start output and wire is
advanced towards the work piece at the Run-In WFS. If an arc is not established within
2.0 seconds, the power source output and wire feed speed skips to the weld se
�
ngs.
START:
Once the wire touches the work and an arc is established, both the machine output and
the wire feed speed ramp to the weld se
�
ngs throughout the start
�
me. The
�
me
period of ramping from the start se
�
ngs to the weld se
�
ngs is called UPSLOPE.
WELD:
A
�e
r upslope, the power source output and the wire feed speed con
�
nue at the weld
se
�
ngs.
BURNBACK:
As soon as the trigger is released, the wire feed speed is turned OFF and the machine
output con
�
nues for the burnback
�
me.
POSTFLOW:
Next, the machine output is turned OFF and shielding gas con
�
nues un
�l
the post
fl
ow
�
mer expires.
FIGURE B.25
Summary of Contents for PIPEFAB CE
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