MAC TOOLS MW165 - Table of Contents

WELDING
can
cause
fire
or
explosion.
Sparks
and
spatteufly
off
from
the
welding
arc.
The
flying
sparks
and
hot
metal,
weld
spatter,
hot
workpiece,
and
hot
equipment
can
cause
fires and
bums. Accidental
contact
of
electrode
or
welding
wire
to
metal
objects
can
cause
sparks, overheating,
orlire.
1.
Protect
yourself
and
others
from
flying
sparks
and hot
metal.
2.
Do
not
weld where
flying
sparks
can
strike
flammable
material.
3.
Remove
all flammables within 35 ft
(10.7
m)
of
the
welding
arc.
If
thIs
is
not
possible,
tightly
cover
them
with
approved
covers.
4.
Be alert
that
welding sparks
and
hot
materials
from
welding
can
easily
go
through
small
cracks
and
openings
to
adjacent
areas
FLYING
SPARKS AND
HOT METAL
can
cause
injury.
Chipping
and
grinding
cause
flying
metal.
As
welds
cool,
they
can
throw
off
slag.
CYLINDERS
can
explode
if
damaged.
Shielding
gas
cylinders
contain
gas
under
high
pressure.
lfdamaged,
a
cylinder
can
explode.
Since
gas
cylinders
are
normally
part
of
the
welding
process,
be
sure
to treat
them
carefully.
1.
Protect
compressed
gas
cylinders
from excessive
heat,
mechanical
shocks,
and
arcs.
2.
Install and
secure
cylinders
in
an
upright
position by
chaining
them
to
a
stationary
support
or
equipment cylinder
rack
to
prevent
falling
or
tipping.
5.
Watch for
fire,
and
keep
a
fire
extinguisher
nearby.
6.
Be
aware
that
welding
on a
ceilIng,
floor,
bulkhead,
or
partition
can cause
fire
on
the
hidden
side.
7.
Do
not
weld
on
closed
containers
such
as
tanks
or
drums.
8.
Connect
work
cable
to
the
work
as
close
to the
welding
area
as
practical
to
prevent
welding
current
from
traveling
long,
possibly
unknown
paths
and
causing
electric
shock
and fire
hazards.
9.
Do
not
use
welder
to
thaw
frozen
pipes.
10.
Remove
stick electrode from
holder
or
cut
off
welding
wire
at
contact
tip
when
not
in
use.
11.
Wear oil-free
protective
garments
such
as
leather
gloves,
heavy
shirt,
cuffless
trousers,
high
shoes,
and
a
cap.
1.
Wear
approved
face
shield
or
safety
goggles.
Side
shields
recommended.
2.
Wear
proper
body
protection
to
protect
skin.
3.
Keep
cylinders
away
from
any
welding
or
other
electrical
circuits.
4.
Never
allow
a
welding
electrode
to
touch
any
cylinder.
5.
Use
only
correct
shielding
gas
cylinders,
regulators,
hoses,
and
fittings designed
for
the
specific
application:
maintain
them
and
associated
parts
in
good
condition.
6.
Turn
face
away
from
valve
outlet when
opening cylinder
valve.
7.
Keep
protective
cap
in
place
over
valve
except
when
cylinder
is
in
use
or
connected
for
use.
8.
Read and
follow
instructions
on
compressed
gas
cylinders.
associated
equipment,
and
CGA
publication
P-i
listed
in
Safety
Standards.
PRINCIPAL SAFETY
STANDARDS
Safety
in
Welding
and
Cutting,
ANSI
Standard
Z49.1,
from
American
Welding
Society,
550
N.W.
LeJeune
Rd.
Miami
FL
33126
Safetyand
Health
Standards,
OSHA
29
CFR
1910,
from
Superintendent
of
Documents,
U.S. Government
Printing
Office,
Washington,
D.C.
20402.
Recommended
Safe
Practices
for the
Preparation
for
Welding
and
Cutting
of Containers That Have Held
Hazardous
Substances,
American
Weld
ing Society
Standard
AWS
F4.1,
from American
Welding Society,
550
N.W.
LeJeune
Ad,
Miami,
FL
33126
National
Electrical
Code,
NFPA Standard
70,
from
National
Fire
Protection
Association,
Batterymarch
Park,
Quincy,
MA
02269.
Safe
Handling
of
Compressed
Gases
in
Cylinders.
CGA
Pamphlet
P-i,
from
Compressed
Gas
Association,
1235 Jefferson
Davis
Highway,
Suite
501.
Arlington,
VA
22202.
Code
forSafety
in
Welding
and
Cutting,
CSA
Standard
Wi
17.2,
from Canadian Standards
Association,
Standards
Sales,
178 Rexdale
Boulevard.
Rexdale,
Ontario,
Canada M9W
1
R3.
Safe
Practices
ForOccupationAndEducational
Eye
And
Face
Protection,
ANSI Standard
Z87.
i,from
American National
Standards
Institute,
1430
Broadway,
New
York,
NY
10018.
Cutting
And
Welding
Processes,
NFPA
Standard
51
B,
from National
Fire
Protection
Association,
Batterymarch
Park,
Quincy,
MA
02269.
TABLE OF
CONTENTS
Ref.
sri 2/92
SECTION
1

SPECIFICATIONS
i-i.
DutyCycleChart
1-2.
Volt-Ampere
Curves
SECTION
2
INSTALLATION
2-1.
Installing
Work
Clamp
2-2.
Installing
Welding
Gun
2-3.
Gun
Polarity
For
Wire
Type
2-4.
Installing
Gas
Supply
2-5. Electrical
Service Guide
2-6.
Selecting
A
Location
And
Connecting
Input
Power
2-7.
Threading
And
Feeding Welding
Wire
2-8. Weld
Parameters
SECTION
3-OPERATION
SECTION
4
MAINTENANCE
&
TROUBLESHOOTING
4-1.
Overload Protection
4-2.
Drive
Assembly
Maintenance
4-3.
Gun Maintenance
4-4.
Troubleshooting
SECTION 5-ELECTRICAL
DIAGRAM
12
SECTION
6
PARTS
LIST
Figure
6-1. Main
Assembly
Figure
6-2.
MWG-16OMA
Gun
2
2
3
3
4
4
5
6
7
8
9
10
ii
ii
13
14