ESAB Aristo U8 - Pinch-Off Pulse; Burnback Time; Gas Post-Flow; Limits

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The final parameter values must always be equal to or lower than the set values for
continuous welding. If the settings for continuous welding are lowered below the set
final values they will also lower the final values. The final parameter values will not
increase again if the setting for continuous welding is increased.
Example:
You have 4 m/min as the final wire feed speed and lower the wire feed speed to
3.5 m/min. The final wire feed speed will also be lower e d to 3.5 m /min. The final wire
speed remains at 3.5 m/min even when the wire feed speed is increased again.
-- Crater filling is enabled in the measure image and the settings are defined in the
settings menu.
3.2.17 Pinch--off pulse
Pinch --off pulse is a pulse that is added to ensure than no ball is formed on the wire
when welding stops.
Only applies for MIG/MAG welding with dip/spray. When pulsing completion is
synchronised with a pulse, finishing pulse.
3.2.18 Burnback time
Burnback time is a delay between the time when the wire starts to brake until the
time when the power source switches off the welding voltage. Too short a burnback
time results in a long wire stickout after completion of welding, with a risk of the wire
being caught in the solidifying weld pool. A long burnback time results in a shorter
stickout, with increased risk of the arc striking back to the contact tip.
3.2.19 Gas post--flow
Gas post--flow controls the time during which shielding gas flows after the arc is
extinguished.
3.2.20 Limits
In this function you can choose a limit number. For settings, see chapter 17
”Configuring limits”.
3.2.21 Spot welding
Select Spot welding when you want to ”spot--weld” thin metal sheets.
Note! You can not shorten the weld time by releasing the gun trigger.
4 MMA WELDING
Main menu ----> Process
MMA welding may also be referred to as welding with coated electrodes. Striking the
arc melts the electrode, and its coating forms a protective slag.
The table on page 69 shows the electrode diameters that can be selected for MMA
welding.
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