Section 8- Welding; 8-1. Shielded Metal Arc - Miller 3000 Owner's Manual

SECTION
8-
WELDING METHODS & TROUBLESHOOTING
mcd5.~ 9192
a
WARNING
ELECTRIC SHOCK
can
kill.
Always
wear
dry insulating gloves.
Insulate
yourself
from work and
ground.
Do
not
touch live electrical
parts.
Keep all panels and
covers
securely in
FUMES AND GASES
can
be hazardous
to
your health.
Keep
your head
out
of the fumes.
Ventilate
area, or use
breathing device.
Read Material Safety Data Sheets (MSDSs) and
manufacturers instructions for material used.
WELDING
can cause
fire
or
explosion.
Do
not
weld
near
flammable material.
Watch for fire; keep
extinguisher nearby.
Do not locate unit
over
combustible surfaces.
Do
not
weld
on
closed containers.
Allow work and
equipment to
cool before
handling
ARC RAYS
can
burn
eyes
and skin;
NOISE
can
damage hearing.
Wear welding helmet with correct shade of filter.
Wear correct
eye,
ear, and body protection.
8-1. Shielded Metal Arc Welding (SMAW)
MOVING PARTS
can cause
injury.
Keep
away from
moving parts such
as
fans, belts,
and rotors.
Keep
all doors,
panels,
covers, and
guards
closed
and
securely
in place.
HOT PARTS
can cause severe
burns.
Allow cooling period before
touching welded
metal.
Wear protective gloves and clothing.
MAGNETIC FIELDS FROM HIGH CUR
RENTS
can
affect
pacemaker operation.
Pacemaker
wearers
keep
away.
Wearers should consult their doctor before
going
near arc
welding, gouging,
or
spot
welding
opera
tions.
WELDING CURRENT
can
damage elec
tronic
parts
in vehicles.
Disconnect both
battery
cables before
welding
on a
vehicle.
Place work clamp
as
close to the weld
as
possible.
See
Safety Rules at beginning
of
manual for basic
welding safety information.
N
OTE ~
Welding current starts
as soon as
electrode touches
the workpiece.
1 Workpiece
Make
sure
workpiece is clean be
fore
welding.
2 Work Clamp
Place
as
close to the weld
as
possi
ble.
3 Electrode
A small diameter electrode
re
quires
less current than
a
large
one.
Follow recommendations of
electrode manufacturer when
set
ting weld
amperage
(see
Figure 8-2).
4 Insulated Electrode Holder
5 Electrode Holder Position
6 Arc
Length
Arc length is the distance from the
electrode to the workpiece. A short
arc
with correct
amperage
will give
a
sharp, crackling sound.
7
Slag
Use
a
chipping hammer and wire
~
brush to
remove
slag. Remove
slag and check weld bead before
making
another weld pass.
ST-151 593
4
4
2
7
Tools Needed:
Figure 8-1. Shielded Metal Arc Welding (SMAW) Procedure
OM-160 518 Page 20