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Example 3: 2-Step Trigger: Customized Arc Start, Crater and Arc End.
Aluminum is an example of where start, crater and burnback are commonly used to improve welding performance.
For this sequence,
PREFLOW:
Shielding gas begins to flow immediately when the gun trigger is pulled.
RUN-IN:
After preflow time 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 settings.
START & UPSLOPE:
Once the wire touches the work and an arc is established, both the machine output and the
wire
feed
speed
ramp to the weld settings throughout the start time. The time period of
ramping from the start settings to the weld settings is called UPSLOPE.
WELD:
After upslope, the power source output and the wire feed speed continue at the weld settings.
BURNBACK:
After the crater time expires, the wire feed speed is turned OFF and the machine output
continues for the burnback time.
POSTFLOW:
Next, the machine output is turned OFF and shielding gas continues until the post flow timer
expires.
2-Step trigger: Special considerations
The weld sequence response depends upon when the trigger is pulled and released and whether or not START or CRATER are active
An example sequence:
Pull the trigger to start feed of wire. When arc is established the sequencer will begin START/UPSLOPE. UPSLOPE and
CRATER/DOWNSLOPE is active, the machine will begin CRATER/DOWNSLOPE and sloping regardless of when the
trigger release occurred.
If the CRATER is disabled and the trigger is released during START/UPSLOPE, the sequencer will move to the
BURNBACK state to end the weld.