Miller Electric AUTO ARC MW 4150 User manual

AUTO
ARCJ~
May
1991
FORM:OM-113
336D
Effective
With
Serial
No.
KA898403
MODEL:
AUTO
ARCfi
MW
4150
AUTO
ARCfi
MW
4200
SPW-1
OWNERS
MANUAL
IMPORTANT:
Read
and
understand the entire
contents
of
this
manual,
with
special
emphasis
on
the
safety
material
throughout
the
manual,
before
MILLER
ELECTRIC
Mfg.
Co.
AMIerGroupLld..Company
installing,
operating,
or
maintaining
this
equipment.
This
unit and these
instructions
are
for
use
only by
persons
trained
and
experienced
in
the
safe
Box
1079
Appleton,
WI
54912
USA
operation
of
welding
equipment.
Do
not
allow
untrained
persons
to
Install,
Tel.
414-734-9821
operate,
or
maintain
this unit.
Contact
your
distributor
if
you
do
not
fully
understand these
instructions.
SB-087
313D
PRINTED
IN
U.S.A.

-~
~
ONE
YEAR LIMITED
WARRANTY
EFFECTIVE: FEBRUARY
17,
1989
This
warranty
supersedes
all
previous
AUTO ARC
warranties and is exclusive with
no
other
guarantees
orwarranties
expressed
or
implied.
COVERAGE

MILLER
Electric
Mfg.
Co. warrants to
the
for
the
purchase price (less
reasonable
depreciation
based
buyer
who
purchases
this
AUTO ARC
Welder
(Welder)
for
upon
actual
use)
upon
return
of
the
goods
at
Consumers
risk
personal,
family
or
household
purposes
(Consumer)
that
this
and
expense.
MILLERs
option
of
repair
or
replacement
will
be
j
Welderwillbefreefromdefectsinmaterialandworkmanshipfor
FOB.,
Factory
at
Appleton,
WI
or
FOB.
at
a
MILLER
autho-
A
a
period
of
one
year
from
the date
of
purchase.
This
warranty
rized service
facility,
therefore,
no
compensation
for
transporta
covers
only
the
original
purchaser
of this Welder.
MILLER
Elec-
tion
costs
of
any
kind
will
be
allowed.
Upon
receipt
of
notice
of
tric does
not
authorize
any party,
including
its authorized dis-
apparentdefectorfailure,
MILLER
shall
instructtheclaimanton
tributors,
to
offer
any
other
warranty
on
behalf of MILLER Elec-
the
warranty
claim
procedures
to
be
followed.
tric.
Upon expiration
of
the
warranty
period,
MILLER
Electric
shall have
no
further
liability
related
to
the
Welder,
except
on
THIS
WARRANTY
IS OFFERED
IN
LIEU OF
ANY
OTHER
warranty
claims
made
during
the
warranty
period.
No
warranty
EXPRESS
WARRANTY;
AND,
EXCEPT
TO
THE
EXTENT
is made
by
MILLER with
respect
to
engines,
trade accessories
PROHIBITED
BY
APPLICABLE
LAW,
THE
DURATION
OF
or
other items
manufactured
by
others.
Such
engines,
trade
ac-
ALL
IMPLIED
WARRANTIES,
INCLUDING
BUT
NOT
cessories
and other items
are
sold
subject
to
the warranties
of
LIMITED
TO
THE
IMPLIED WARRANTIES OF
MERCHAN
their
respective
manufacturers,
if
any.
All
engines
are war-
TABILITYAND
FITNESS FORAPARTICULAR
PURPOSE,
IS
ranted
by
their
manufacturer
for
two
years
from
date
of
original
LIMITED
TO
THE
DURATION OF THIS
WARRANTY.
purchase,
except
Deutz
engines
which have
a one
year,
2000
hour
warranty.
ANY
EXPRESS
WARRANTY
NOT
PROVIDED
HEREIN
AND
ANY
IMPLIED
WARRANTY.
GUARANTY
OR
REPRE
MILLER shall be
required
to
honor
warranty
claims
on
war-
SENTATION
AS TO
PERFORMANCE,
AND ANY
REMEDY
ranted
Equipment
in
the
event
of failure
resulting
from
a
defect
FOR
BREACH
OF CONTRACT
WHICH,
BUT FOR THIS
within the
following
periods
from
the date of
delivery
of
Equip-
PROVISION,
MIGHT ARISE
BY
IMPLICATION,
OPERATION
ment to
the
original
user:
OF
LAW,
CUSTOM OF
TRADE
OR COURSE
OF
DEALING,
1
A
Id
d
1
INCLUDING
ANY
IMPLIED WARRANTY
OF
MERCHANT-
2
rc we
ers,
power
sources,
an
comporien
s
.
year
ABILITY
OR OF
FITNESS FOR PARTICULAR
PURPOSE,
Ibr
rnai
power
re
I
iers
years
WITH
RESPECT TO
ANY AND
ALL
EQUIPMENT
FUR
3.
AU
welding
guns,
feeder/guns
and
torches
90
days
NISHED
BY
MILLER
IS EXCLUDED
AND
DISCLAIMED
BY
4.
Replacement
or
repair
parts,
exclusive of
labor
.
60
days
LLE
5.
Batteries
6 months
. 
Some
states
do
not
allow limitations
on
how
long
an
implied
provided
that MILLER
is
notified
in
writing
within
thirty
(30)
days
warranty
lasts,
so
the above limitation
may
not
apply
to
you.
of
such
failure.
This
warranty
gives
you
specific
legal rights,
and
you may
also
have
other
rights
which
vary
from
state to state.
WHAT
IS
NOT COVERED

This
warranty
does
not
extend
to
any
Welder
subjected
to
misuse,
neglect,
accident,
or
in-
THE
PURCHASERS
REMEDIES FOR
A
DEFECTIVE
warranty
repair
by
anyone
except
MILLER
Electric
or
its autho-
WELDER,
TO
THE
EXTENT PERMITTED
BY
APPLICABLE

rized service
stations.
Further,
thiswarranty only
extends
to
the
LAW,
ARE
LIMITED
TO
THE REMEDY
PROVIDED
BY
THIS
original purchaser
of this
Welder.
WARRANTY.
TO
THE EXTENT
ENFORCEABLE
UNDER
APPLICABLE
LAW,
MILLER
ELECTRIC
SHALL
IN
NO
In
the
case
of
MILLERs
breach of
warranty
or
any
other
duty
EVENT
BE LIABLE
FOR
CONSEQUENTIAL,
INCIDENTAL
with
respect
to
the
quality
of
any
goods,
the
exclusive remedies
OR SPECIAL
DAMAGES
ARISING OUT OF
THE
USE
OF,
OR
therefore
shall
be,
at
MILLERs
option (1)
repair
or
(2) replace-
INABILITY TO
USE,
THE
WELDER,
WHETHER
BASED ON
p
ment
or,
where
authorized
in
writing
by
MILLER
in
appropriate
BREACH OF
THIS
WARRANTY,
MILLER
ELECTRICS NEG

cases,
(3)
the
reasonable
cost
of
repair
or
replacement
at
an
LIGENCE
OR
OTHER
TORT,
OR
ON
ANY
THEORY OF
authorized MILLER
service station
or
(4)
payment
of
or
credit
STRICT
LIABILITY.
-~
~

ERRATA
SHEET
After
this
manual
was
printed,
refinements
in
equipment
design
occurred. This
sheet lists
exceptions
to
data
appearing
later
in this manual.
AMENDMENT
TO SECTION
7
MAINTENANCE
&
TROUBLESHOOTING
Amend
Section
7-lA.
ROUTINE
MAINTENANCE:
Fan
Motor
This
unit
is
equipped
with
an
exhaust
fan and relies
on
forced
draft for
adequate
cooling.
The
fan
motor
needs
oiling
every
six months
using
SAE
20
oil.

OM-113
3360
5191
RECEIVING-HANDLING
Before
unpacking
equipment,
check
carton
for
any
dam- Use
the
following
spaces
to
record the
Model
Designa
age
that
may
have
occurred
during
shipment.
File
any
tion
and
Serial
or
Style
Number
of
your
unit.
The
infor
claims
for
loss
or
damage
with the
delivering
carrier. mation
is
located
on
the data
card
or
the
nameplate.
Assistance
for
filing
or
settling
claims
may
be
obtained
from
the
distributor
and/or
the
equipment
manufactur-
Model
________________________________
ers
Transportation
Department.
Serial
or
Style
No.
____________________
When
requesting
information
about
this
equipment,
al
ways
provide
the
Model
Description
and
Serial
or
Style
Date
of
Purchase
_____________________
Number.
TABLE
OF
CONTENTS
Section
No.
Page
No.
SECTION
1

SAFETY
RULES FOR OPERATION OF ARC WELDING POWER
SOURCE
1-1.
Introduction
1
1-2.
General
Precautions
1
1-3.
Arc
Welding
4
1-4.
Standards
Booklet
Index
5
SECTION
2-
SAFETY
PRECAUTIONS
AND
SIGNAL WORDS
2-1.
General
Information
And
Safety
6
2-2.
Safety
Alert
Symbol
And
Signal
Words
6
SECTION
3SPECIFICATIONS
3-1.
Volt-Ampere
Curves
8
3-2.
Duty
Cycle
8
3-3.
Description
8
3-4.
Supplied
Equipment
8
3-5. Additional
Required
Equipment
9
3-6.
Optional
Equipment
10
3-7.
Consumable
Parts
10
SECTION
4INSTALLATION
OR
RELOCATION
4-1.
Site Selection
10
4-2.
Transporting
Methods
10
4-3.
Running
Gear
Installation
11
4-4.
Optional
SPW-1
Panel
Installation
11
4-5.
Shielding
Gas
Installation
12
4-6.
Work
Cable
Assembly
12
4-7.
Weld
Polarity
Selection
14
4-8.
MWG-200
Welding
Gun
Connections
14
4-9.
Installation
Of
Optional
Spool
Gun
14
4-10.
Welding
Wire
Spool
Installation
16
4-11.
Hub
Tension
Adjustment
16
4-12.
Electrical
Input
Connections
16
4-13.
Welding
Wire
Threading
18

Section
No.
Page
No.
SECTION
5OPERATOR
CONTROLS
5-1.
Power Switch
And Pilot
Light
19
5-2. Thickness
Volts
Selector
19
5-3. Fine
Tuning
Wire
Speed
Control
20
5-4.
Fan-On-Demand~
20
5-5.
Optional
Spot/Pulse
Panel
Controls
20
SECTION
6
SEQUENCE
OF
OPERATION
6-1.
Gas
Metal
Arc
Welding
(GMAW)-Continuous
And
Gas
Metal
Arc
Welding-Pulsed
Arc
(GMAW-P)
21
6-2.
Gas
Metal
Arc
Welding
(GMAW)-Spot
(Models
With
Optional
SPW-1
Panel
Only)
22
6-3.
Shutting
Down
23
SECTION 7
MAINTENANCE
&
TROUBLESHOOTING
7-1.
Routine
Maintenance
24
7-2.
Replacing
Drive Roll And Wire Inlet
Guide
25
7-3. Drive
Housing Realignment
26
7-4.
Replacing
Hub
Assembly
26
7-5.
Inspecting
And
Replacing
Motor Brushes
27
7-6.
Overload
Protection
27
7-7.
Thermal
Overload
Protection
28
7-8. Printed
Circuit
Board
Replacement
28
7-9.
Troubleshooting
28
SECTION
8
ELECTRICAL DIAGRAMS
Diagram
8-1.
Circuit
Diagram
For
MW
4150
Models
30
Diagram
8-2.
Circuit
Diagram
For
MW
4200
Models
31
Diagram
8-3.
Circuit
Diagram
For
SPW-1
Panel
31
Diagram
8-4.
Wiring Diagram
For
SPW-1 Panel
32
Diagram
8-5.
Circuit
Diagram
For
SPW-1 Panel
Dual
Timer/Pulser
Board
PC5O
33
SECTION
9
WELDING TECHNIQUES
&
TROUBLESHOOTING
9-1.
Gas
Metal
Arc
Welding
(GMAW)

Continuous
Seam
34
9-2.
Gas
Metal
Arc
Welding
(GMAW)-Pulsed
35
9-3.
Gas
Metal Arc
Welding
(GMAW)-Spot
36
9-4.
Plug
Welds
37
9-5.
Skip
Welding
37
9-6.
Troubleshooting
The
Gas
Metal
Arc
Welding
Process
37
SECTION
10
AUTO BODY
REPAIR
APPLICATION
10-1.
Pointers For
Welding
Auto
Body
Sheet Metal
40
10-2.
Procedure
For
Welding
Mild
Steels
40
10-3.
Procedures For
Welding
Door
Panels
40
10-4.
How To
Prevent
Glass
Breakage
And
Spatter
On
Windows
41
10-5.
Procedures For
Welding
Fenders
And
Quarter
Panels
41
10-6.
Welding
Frames
And
High
Strength
(HSS)
Steels
41

Section
No.
Page
No.
SECTION
11

PARTS LIST
Figure
11-1.
Main
Assembly
42
Figure
11-2.
Baffle,
Air
w/Components 44
Figure
11-3. Drive
Assembly,
Wire
46
Figure
11-4.
Panel,
Rear
w/Components
47
Figure
11-5.
Panel,
Front
w/Components
48
Figure
11-6.
SPW
1
Spot
Panel
(Optional)
50
Figure
11-7.
Circuit
Card,
Dual
Timer/Pulser
P050
51
Figure
11-8.
Running
Gear
52
LIST OF
CHARTS
AND
TABLES
Table
3-1.
Specifications
7
Chart
3-1.
Volt-Ampere
Curves
7
Chart
3-2.
Duty
Cycle
7
Table 4-1.
Input
Conductor
And
Fuse
Size
17
Table
6-1.
Suggested
Parameters
For
Continuous
Gas
Metal
Arc
Welding
(GMAW) 22
Table
6-2.
Checking
Weld
Parameters
23
Table
7-1.
Maintenance
Schedule
24
Table
7-2.
Troubleshooting
29

SECTION
1

SAFETY
RULES
FOR
OPERATION
OF
ARC WELDING
POWER
SOURCE
1-1.
INTRODUCTION
We learn
by
experience.
Learning safety through
per
sonal
experience,
like
a
child
touching
a
hot
stove
is
harmful,
wasteful,
and
unwise. Let the
experience
of
oth
ers
teach
you.
Safe
practices
developed
from
experience
in
the
use
of
welding
and
cutting
are
described
in
this
manual.
Re
search,
development,
and field
experience
have
evolved
reliable
equipment
and safe
installation,
opera
tion,
and
servicing
practices.
Accidents
occur
when
equipment
is
improperly
used
or
maintained.
The
rea
son
for
the
safe
practices
may
not
always
be
given.
Some
are
based
on
common
sense,
others
may
require
technical
volumes
to
explain.
It
is wiser
to follow
the
rules.
Read
and
understand
these safe
practices
before
at
tempting
to
install,
operate,
or
service
the
equipment.
Comply
with
these
procedures
as
applicable
to
the
par
ticular
equipment
used and
their
instruction
manuals,
for
personal
safety
and
for
the
safety
of
others.
Failure
to
observe
these
safe
practices
may
cause
seri
ous
injury
or
death.
When
safety
becomes
a
habit,
the
equipment
can
be
used with
confidence.
These
safe
practices
are
divided into
two
Sections:
1-General
Precautions,
common
to
arc
welding
and
cut
ting;
and 2-Arc
Welding
(and
Cutting)
(only).
Reference
standards: Published
Standards
on
safety
are
also
available for
additional
and
more
complete
pro
cedures than
those
given
in
this
manual.
They
are
listed
in
the
Standards
Index
in
this
manual.
ANSI
Z49.1 is the
most
complete.
The
National
Electrical
Code,
Occupational
Safety
and
Health
Administration,
local industrial
codes,
and local
inspection
requirements
also
provide
a
basis for
equip
ment
installation,
use,
and service.
1-2.
GENERAL
PRECAUTIONS
Difterent
arc
welding
processes,
electrode
alloys,
and
fluxes
can
produce
difterent
fumes,
gases,
and
radiation
levels.
In
addition
to
the
information
in
this
manual,
be
sure
to
consult flux
and
electrode
manu
facturers
Material
Safety
Data
Sheets
(MSDS5)
for
specific
technical
data
and
precautionary
measures
concerning
their
material.
A.
Burn
Prevention
Wear
protective
clothing-gauntlet gloves
designed
for
use
in
welding,
hat,
and
high safety-toe
shoes.
Button
shirt
collar and
pocket
flaps,
and
wear
cuffless
trousers
to
avoid
entry
of
sparks
and
slag.
Wear
helmet
with
safety
goggles
and
glasses
with
side
shields
underneath,
appropriate
filter
lenses
or
plates
(protected
by
clear
cover
glass).
This is
a
MUST
for
welding
or
cutting,
(and
chipping)
to
protect
the
eyes
from
radiant
energy
and
flying
metal.
Replace
cover
glass
when
broken,
pitted,
or
spattered.
See
1
-3A.2.
Avoid
oily
or
greasy
clothing.
A
spark
may
ignite
them.
Hot
metal such
as
electrode stubs
and
workpieces
should
never
be handled without
gloves.
Medical
first
aid
and
eye
treatment.
First
aid
facilities
and
a
qualified
first aid
person
should
be
available
for
each
shift
unless
medical facilities
are
close
by
for
immediate
treatment of flash
burns
of
the
eyes
and skin
burns.
Ear
plugs
should
be
worn
when
working
on
overhead
or
in
a
confined
space.
A
hard hat
should
be
worn
when
others work overhead.
Flammable
hair
preparations
should
not
be
used
by
per
sons
intending
to
weld
or
cut.
B.
Toxic Fume Prevention
Severe
discomfort,
illness
or
death
can
result
from
fumes,
vapors,
heat,
or
oxygen
enrichment
or
depletion
that
welding
(or
cutting)
may
produce.
Prevent
them
with
adequate
ventilation
as
described
in
ANSI
Standard
Z49.1 listed
in
Standards
Index.
NEVER
ventilate with
oxygen.
Lead
-,
cadmium
-,zinc-,
mercury-,
and
beryllium-bear
ing
and similar
materials,
when
welded
(or
cut)
may
pro
duce harmful concentrations
of
toxic
fumes.
Adequate
local exhaust
ventilation
must
be
used,
or
each
person
in
the
area as
well
as
the
operator
must
wear
an
air-sup
plied respirator.
For
beryllium,
both
must
be
used.
Metals
coated
with
or
containing
materials
that emit
toxic
fumes should
not
be heated
unless
coating
is
removed
from
the work
surface,
the
area
is
well
ventilated
and,
if
necessary,
while
wearing
an
air-supplied
respirator.
Work
in
a
confined
space
only
while
it is
being
ventilated
and,
if
necessary,
while
wearing
an
air-supplied
respira
tor.
Gas
leaks
in
a
confined
space
should
be
avoided.
Leaked
gas
in
large
quantities
can
change
oxygen
con
centration
dangerously.
Do
not
bring
gas
cylinders
into
a
confined
space.
Leaving
confined
space,
shut
OFF
gas
supply
at
source
to
prevent
possible
accumulation of
gases
in
the
space
if
downstream
valves
have been
accidentally
opened
or
left
open.
Check to
be
sure
that the
space
is safe before
re-entering
it.
Vapors
from chlorinated
solvents
can
be
decomposed
by
the heat
of
the
arc
(or
flame)
to
form
PHOSGENE,
a
highly
toxic
gas,
and other
lung
and
eye
irritating
prod
ucts.
The
ultraviolet
(radiant)
energy
of the
arc can
also
decompose
trichloroethylene
and
perchloroethylene
va
pors
to
form
phosgene.
DO NOT
WELD
or
cut
where sol
vent
vapors
can
be
drawn
into the
welding
or
cutting
at
mosphere
or
where the radiant
energy
can
penetrate
to
OM-113
336
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1

atmospheres
containing
even
minute
amounts
of
trichloroethylene
or
perchioroethylene.
C.
Fire
and
Explosion
Prevention
Causes of
fire and
explosion
are:
combustibles
reached
by
the
arc,
flame,
flying
sparks,
hot
slag
or
heated
mate
rial;
misuse of
compressed
gases
and
cylinders;
and
short circuits.
BE
AWARE
THAT
flying
sparks
or
falling
slag
can
pass
through
cracks,
along
pipes,
through
windows
or
doors,
and
through
wall
or
floor
openings,
out
of
sight
of
the
goggled
operator.
Sparks
and
slag
can
fly
35
feet.
To
prevent
fires
and
explosion:
Keep
equipment
clean and
operable,
free of
oil,
grease,
and
(in
electrical
parts)
of
metallic
particles
that
can
cause
short
circuits.
If
combustibles
are
in
area,
do
NOT
weld
or
cut.
Move
the work
if
practicable,
to
an area
free of
combustibles.
Avoid
paint
spray
rooms,
dip
tanks,
storage
areas,
venti
lators.
If
the
work
cannot
be
moved,
move
combustibles
at
least 35
feet
away
out
of
reach of
sparks
and
heat;
or
protect
against ignition
with
suitable
and
snug-fitting,
fire-resistant
covers or
shields.
Walls
touching
combustibles
on
opposite
sides should
not
be welded
on
(or cut).
Walls,
ceilings,
and
floor
near
work should be
protected by
heat-resistant
covers or
shields.
Fire
watcher
must
be
standing by
with suitable fire extin
guishing
equipment
during
and
for
some
time after weld
ing
or
cutting
if:
a.
appreciable
combustibles
(including building
construction)
are
within 35
feet
b.
appreciable
combustibles
are
further
than
35
feet but
can
be
ignited by
sparks
c.
openings
(concealed
or
visible)
in
floors
or
walls
within
35 feet
may
expose
combustibles
to
sparks
d.
combustibles
adjacent
to
walls,
ceilings,
roofs,
or
metal
partitions
can
be
ignited by
radiant
or
conducted heat.
Hot work
permit
should
be obtained before
operation
to
ensure
supervisors
approval
that
adequate precautions
have
been
taken.
After work
is
done,
check that
area
is free of
sparks,
glowing
embers,
and
flames.
An
empty
container that
held
combustibles,
or
that
can
produce
flammable
or
toxic
vapors
when
heated,
must
never
be
welded
on
or
cut,
unless container has
first
been
cleaned
as
described
in
AWS Standard
A6.O,
listed
7 in
Standards
Index.
This includes:
a
thorough
steam
or
caustic
cleaning
(or
a
solvent
or
water
washing, depending
on
the
combusti
bles
solubility)
followed
by
purging
and
inerting
with
ni
trogen
or
carbon
dioxide,
and
using
protective equip-
ment
as
recommended
in
A6.O.
Waterfilling
just
below
working
level
may
substitute
for
inerting.
A
container
with unknown
contents
should
be
cleaned
(see
preceding paragraph).
Do
NOT
depend
on sense
of
smell
or
sight
to
determine
if
it
is
safe
to
weld
or
cut.
Hollow
castings
or
containers
must
be vented before
welding
or
cutting.
They
can
explode.
Explosive
atmospheres.
Never weld
or
cut
where the
air
may
contain
flammable
dust,
gas,
or
liquid
vapors
(such
as
gasoline).
D.
Compressed
Gas
Equipment
Standard
precautions.
Comply
with
precautions
in
this
manual,
and
those
detailed
in
CGA
Standard
P-i,
SAFE
HANDLING
OF
COMPRESSED
GASES
IN
CYLIN
DERS,
listed
ii
in
Standards
Index.
1.
Pressure
Regulators
Regulator
relief valve
is
designed
to
protect
only
the
regulator
from
overpressure;
it
is
not
intended
to
protect
any
downstream
equipment.
Provide
such
protection
with
one
or
more
relief devices.
Never
connect
a
regulator
to
a
cylinder
containing
gas
other than
that
for which
the
regulator
was
designed.
Remove
faulty regulator
from service
immediately
for
re
pair (first
close
cylinder
valve).
The
following
symptoms
indicate
a
faulty regulator:
Leaks-if
gas
leaks
externally.
Excessive
Creep-if
delivery
pressure
continues
to
rise
with
downstream
valve
closed.
Faulty
Gauge-if
gauge
pointer
does
not
move
off
stop
pin
when
pressurized,
nor
returns to
stop
pin
after
pressure
release.
Repair.
Do
NOT
attempt
to
repair.
Send
faulty
regulators
for
repair
to
manufacturers
designated
repair
center,
where
special
techniques
and tools
are
used
by
trained
personnel.
2.
Cylinders
Cylinders
must
be
handled
carefully
to
prevent
leaks
and
damage
to
their
walls, valves,
or
safety
devices:
Avoid
electrical
circuit
contact
with
cylinders
including
third
rails,
electrical
wires,
or
welding
circuits.
They
can
produce
short
circuit
arcs
that
may
lead
to
a
serious acci
dent.
(See
1-3C.)
ICC
or
DOT
marking
must
be
on
each
cylinder.
It
is
an
assurance
of
safety
when the
cylinder
is
properly
han
dled.
Identifying
gas
content.
Use
only cylinders
with
name
of
gas
marked
on
them;
do
not
rely
on
color
to
identify
gas
content.
Notify
supplier
if unmarked.
NEVER
DEFACE
or
alter
name,
number,
or
other
markings
on a
cylinder.
It
is
illegal
and
hazardous.
Empties: Keep
valves
closed,
replace
caps
securely;
mark
MT;
keep
them
separate
from
FULLS
and
return
promptly.
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2