Entrenamiento en Seguridad de Soldadura
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Transcript of Entrenamiento en Seguridad de Soldadura
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School Safety Training
Welding, Cutting and Brazing
WAC 296-24-Part I
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Notice
This presentation is provided to all Educational ServiceDistrict 101 (ESD 101) schools at no cost.
This presentation contains copyrighted materials purchasedby ESD 101 for the exclusive use of training school personnelwithin ESD 101.
This presentation may not be reproduced except to printhandouts or notes pages for use during training withinESD 101 school districts.
If the school district does not have Microsofts PowerPointsoftware available, a PowerPoint viewer can be downloadedfrom the internet at no cost.
Questions may be directed to the ESD 101 Risk Manager.
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Compressed gases are covered in WAC296-24-Part K, but are an integral part ofwelding, cutting, and brazing
Compressed gas hazards
Gases used for cutting, brazing,and shielding the weld
Refer to another ESD 101 program titled
Compressed Gases.
Compressed Gases
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Cylinder Inspection Most compressed gas
cylinders
must be periodically tested/
recertified (DOT) All cylinders contain markings/
symbols that indicate
certification
status
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Several of the gases have specific
WISHA standards
These gases include acetylene, hydrogen,
oxygen, nitrous oxide, ammonia, and LPG
Specific Gases
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Basic Fire Prevention Fire hazards must be
removed, or Guards installed, or
Welding/cutting must NOTtake place
Hot work permit shouldbe used to ensure thatall fire hazards arecontrolled
Use of fire watch
1/2 hour after operationceases
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Fire Prevention (cont.) Fire extinguishers must be
charged/available
Neverweldin the presence ofexplosive atmospheres
Do not weld on used drums, barrels,tanks, or other containers
Test potentially explosivecontainers for flammableatmospheres
Shut off cylinder valves when theyare not in use
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Protection of Personnel Keep working surfaces clean
and unobstructed
Wear eye protection Use safety glasses under welding
hood
Protective clothing must be
used per WAC 296-800-160
Welding in confined spaces
Machines located outside ofspace
Other confined spaceprecautions apply (1910.146)
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WAC 296-24-68221
AcetyleneFlammable
Unstable
Cannot be piped above 15 psi
Oxygen-Fuel Welding
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Basic Rules forOxyacetylene Welding
Blow out cylinder valve
Release regulator
Stand to one side of regulator
Open cylinder valve slowly
Not more than 15 psi
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Basic Rules (cont.)
Purge oxygen and acetylene passages
Light the acetylene
Never use oil or grease
Do not use oxygen
Keep your work area clean
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Storage area must be well ventilated Cylinders must be at least 20 feet from
combustibles
Valves must be closed
Valve protection must be in place
Inside storage must be limited to 2,000 cubic
feet.
Cylinders must be stored in upright position Oxygen must be at least 20 feet from fuel gas or
5 feet with a 1/2 hour fire barrier
Storage of Fuel Cylinders
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Never lift cylinders by the service valve or
valve protection (use slings, net, etc.)
Keys, handles, hand wheels must be
present Use proper regulator
Open acetylene valve no more than 11/2
turns
Gas Cylinder Precautions
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Protective Devices Pressure relief valves
Backflow preventer
Fuel gas hosered (sometimes black)
Oxygen hosegreen
Hose protection required
Pressure-reducing regulators
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Arc Welding Electric current fuses
parent metal and
welding rod
Indispensable inmetal working
Used for carbon and
alloy steels and non-
ferrous metals
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Air must be kept away from weld area
Shielding protects the integrity of the
weld joint
Flux or gas mixture is used as a shield
Shielding
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Common Arc Welding Processes Shielded metal arc welding (stick welding)
Gas metal arc welding (MIG welding)
Gas tungsten arc welding (TIG welding)
Flux cored arc welding
Submerged arc welding
Arc cutting
Plasma arc cutting
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Welding machine must be grounded
Work area must be dry and free of hazards
Connections must be tightly made
Splices within 10 feet of holder areprohibited
Cables must be maintained and conductors
well insulated
Installation and Maintenance
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Welding Health Hazards
Zinc Cadmium Beryllium Iron Oxide Mercury Lead Fluorides
Chlorinatedhydrocarbonsolvents
Phosgene
Carbon monoxide Ozone Nitrogen Oxides
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Welding Physical Hazards
Ultraviolet radiation
Infrared radiation
Intense visible light
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Lens Shadesfor Typical Welding
Welding
Process
Shielded metal arc
Gas metal arc Gas Tungsten arc
Torch brazing
Gas welding
Lens Shade
Number
10-14
11-12
12
3 or 4
4-8
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Quiz
1. Fuel cylinders must be stored at least ____ feetfrom combustibles.
2. Shielding is a process used to protect the eyesfrom welding fume. True or False
3. Three physical welding hazards are ___________radiation, infrared radiation and intense visiblelight.
4. You should not use oxygen as a substitute for air.True or False
5. As long as they are secure, fuel cylinders can bestored on their side. True or False
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Quiz (cont.)
6. Gas Metal Arc Welding is also known as_____________ welding.
7. Exposure to zinc fumes may cause metal fumefever. True or False
8. Cylinder inspection requirements are regulated bythe Department of__________.
9. Acetylene has a very narrow flammable range.True or False
10.Backflow prevention should be provided foroxygen cylinders. True or False
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Quiz Answers
1. Fuel cylinders must be stored at least 20 feet fromcombustibles.
2. False. Shielding is a process used to keep air awayfrom the weld.
3. Three physical welding hazards are ultravioletradiation, infrared radiation, and intense visiblelight.
4. True. You should not use oxygen as a substitutefor air.
5. False. Fuel cylinders must always be storedupright.
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Quiz Answers (cont.)
6. Gas Metal Arc Welding is also known as MIGwelding.
7. True. Exposure to zinc fumes may cause metalfume fever.
8. Cylinder inspection requirements are regulatedby the Department of Transportation.
9. False. Acetylene has a very wide flammable range.
10.True. Backflow prevention should be provided forall oxygen cylinders.