ULTRAFEED VAF-4
4-8 OPERATION Manual 0-5332
Advanced Feature
Left Display
Feature Description
Right Display
Parameter / Selection
Ramp Time
This is used to set the time to ramp
from the creep wire feed speed to the
selected wirefeed speed setting.
Default Ramp Time = 0.2 sec
0.1 to 1.0 seconds
Ramp Time plus Run In is used to optimize arc starting characteristic.
Post Flow
This is used to adjust the post
gas flow time once the arc has
extinguished.
Default Post Flow = 0.1 sec
NOTE
Gun should be kept in
position until Post Flow
time is completed.
0.0 – 30 seconds
This control is used to dramatically reduce weld porosity at the completion of the
weld.
Burn Back
This is used to adjust the amount
of MIG wire that protrudes from the
MIG gun after the completion of MIG
welding (commonly referred to as
stick out)
Default Burn Back = 0.15 sec
NOTE
Gun should be kept in
position until Burn Back
time is completed.
0.00 to 1.00
seconds
If the Burn Back time is set too long, the MIG wire may burn back to the tip of the
MIG gun.
Crater
This is used to fill in the “crater” at
the end of the weld. It only works
with 4T mode and the Crater Volts /
Crater Wirefeed Speed must be set.
Default Crater = Off
Crater Mode ON /
OFF
Crater Volts
(only if Crater mode is ON)
This sets the reduced volts during
crater operation in 4T at the end of
the weld.
Default Crater Volts = 70%
An example is if Preview Volts is
set to 26V and crater volts is set to
70% crater volts will be 18.2V. Note
minimum crater volts is determined
by minimum preview voltage of
Wirefeeder.
0 – 100% of
Welding Volts
Setting
