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PREPARING TO WELD
Page 18
450 PLATE
37.5 °
SINGLE BEVELJOINT
DOUBLE BEVEL JOINT
BUTT WELD JOINTS
BUTT JOINT
600PLATE
SINGLE V JOINT
6O 0
DOUBLEV JOINT
I
CLOSED JOINT
DOUBLE VEE JOINT
3/32" TO 1/8"
60--
"-_N '_''r
1/16" TO 1/8" _
OPEN JOINT
SHOUI.._ER EDGE
1/4" OR MORE
V
VEE JOINT
--\/
FEATHER EDGE
1/8" OR MORE
SINGLE FILLET
LAP JOINT
LET WELD JOINTS
DOUBLE FILLET
__
SINGLE FILLET T-JOINT
SINGLE STRAP JOINT
DOUBLE STRAP JOINT
DOUBLE FILLET T-JOINT
ALUMINUM
WELDING
PREPARATION
1. A clean weld-joint area is a must in obtaining a
quality aluminum
weld. Remove
dirt and oxida-
tion with a stainless steel bristled wire brush and
any oil or grease
with a good chemical
alumi-
num cleaner.
2. Aluminum
is often anodized
to prevent
it from
oxidizing.
However,
and anodized
surface
will
NOT conduct
electricity.
Therefore,
to weld ano-
dized
aluminum,
you
must
sand
or grind the
anodized
coating
from the weld joint area and
from the site where
the ground
clamp will be
connected.
To determine
if the aluminum
you intend to weld is
anodized,
simply touch the two probes of an elec-
trical continuity
test light or ohmmeter
to the alumi-
num in question.
The probes should
be an inch or
two apart.
If there
is no indication
of electrical
continuity,
the aluminum
IS anodized.
CONNECT
WELDER
GROUND
Attach the ground clamp to the work piece making
sure that the work piece is cleaned of dirt, oil, rust,
scale, oxidation,
and paint at the point of connec-
tion.
It is best to connect the ground clamp directly to the
work piece and as close to the weld as possible. If
it is impractical to connect the ground clamp di-
rectly to the work piece, connect it to metal that is
securely attached to the work piece, but not elec-
tricallyinsulated from it. Also, make sure this other
metal is of about the same or greater thickness
than that of the work piece.
RISK
OF
ELECTRONIC
COMPONENT
DAM-
AGE!
If the ground
clamp is being connected
to
an automobile
or other equipment
with on-board
computer systems, solid state electronic controls,
solid state sound systems,
etc., DO NOT WELD
until disconnecting
the cable from the battery that
is attached
to chassis ground.
Failure to do so
may result in ELECTRONIC
COMPONENT
DAM-
AGE!
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