21
SC3402
Operations
‐
Welding
Stud
Welding
‐
Step
by
Step
The
weld
gun
is
positioned
over
the
base
material
and
the
main
gun
spring
is
partially
compressed.
Hold
gun
perpendicular
to
work
surface
and
hold
ferrule
firmly
against
the
surface.
The
trigger
is
pressed
and
the
stud
lifts
off
the
base,
drawing
an
arc.
The
arc
melts
the
end
of
the
weld
stud
and
the
base
material
below.
The
arc
shield
(ferrule)
concentrates
the
heat
below
the
weld
stud
and
contains
the
mol
‐
ten
metal
within
the
weld
zone.
Do
not
move
weld
gun
during
weld.
The
main
spring
plunges
the
weld
stud
down
into
the
molten
pool
of
metal
in
the
base
material.
The
cycle
is
completed
in
less
than
a
second
and
the
resulting
weld
bond
develops
the
full
strength
of
the
fastener
in
the
weld
zone.
Allow
metal
to
cool
and
withdraw
gun
from
the
stud,
pulling
the
gun
straight
up
off
of
the
stud.
The
weld
gun
is
withdrawn
from
the
weld
stud
leaving
and
the
ferrule.
The
ferrule
is
broken
away
and
discarded.
Visually
inspect
weld.
***
Note
‐
when
determining
finished
length
required
for
the
particular
application,
keep
in
mind
the
reduction
in
length
(burn
‐
off)
from
stud
welding
operations.
TRU
‐
WELD
stud
lengths
are
al
‐
ways
given
before
weld.
Diameter
of
Stud
Reduction
in
Length
1/4”
thru
1/2”
1/8”
5/8”
thru
7/8”
3/16”
1”
and
over
1/4”