N1500i FACS Manual
34
Part No. 729-110-053 V.1.03
© 2018 Nelson Stud Welding, Inc. All rights reserved.
The important thing to note is that normally, the stud begins to drop at
Front Panel Time
– Drop Time. But if the Drop Time exceeds the Front
Panel Time, the stud would need to begin to drop prior to the start of
the weld in order to make the Actual Weld Time to be the same as the
Front Panel Time. This is done by releasing the gun coil during the pilot
arc stage.
For example:
•
Front Panel Time = 20ms
•
Drop Time (F31) = 30ms
•
Plunge short circuit on-time (F2) = 50ms
Since [20ms
– 30ms] < 0, the, the gun coil is released prior to starting the
main current. So the weld profile would look like this:
The resulting Actual Weld Time is 20ms. The stud would still take 30ms
to drop, but the main current and main arc would only be 20ms.
Touching Work
ms
P
il
o
t
c
u
rren
t
st
ar
t
G
u
n
C
o
il
Re
lea
sed
S
tu
d
H
it
W
or
k
p
ie
ce
M
ai
n
C
u
rr
en
t
S
to
p
