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8/6/2019 Welding Cutting Brazing Safety
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BLR¶sSafety Training Presentations
Welding, Cutting and Brazing29 CFR 1910, Subpart Q
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Covered in Subpart H, but an integral part of welding, cutting, and brazing
Compressed gas hazards
Gases used for cutting, brazing,and ³shielding´ the weld
Compressed Gases
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Most compressed gas cylindersmust be periodically tested/recertified (DOT)
All cylinders contain markings/symbols that indicate certificationstatus
Cylinder Inspection
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Several of the gases have specificOSHA 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 NOT take place
Hot work permit should be used toensure that all fire hazards are controlled
Use of fire watch
± 1/2 hour after operation ceases
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Fire extinguishers must becharged/available
Never weld in the presence
of explosive atmospheres Do not weld on used drums,
barrels, tanks, or other containers
Test potentially explosive
containers for flammableatmospheres
Shut off cylinder valveswhen they are not in use
Fire Prevention (cont.)
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Protection of Personnel
K eep working surfaces clean and unobstructed
Wear eye protection
± Use safety glasses under welding hood
Protective clothing must be used per 1910.132
Welding in confined spaces
± Machines located outside of space
± Other confined space precautions apply (1910.146)
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29 CFR 1910.253
Acetylene
± Flammable
± Unstable
± Cannot be piped above 15 psi
Oxygen-Fuel Welding
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Basic Rules for Oxyacetylene 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
K eep your work area clean
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Storage area must be well ventilated
Cylinders must be at least 20 feet fromcombustibles
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.)
K eys, 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 preventers
Fuel gas hose²red (sometimes black)
Oxygen hose²green
Hose protection required
Pressure-reducing regulators
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Arc Welding
Electric current fuses parent metal andwelding rod
Indispensable inmetal working
Used for carbon andalloy steels and non-ferrous metals
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Air must be kept away from weld area
Shielding protects the integrity of theweld joint
Flux or gas mixture is used as a ³shield´
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 are prohibited
Cables must be maintained and conductorswell insulated
Installation and Maintenance
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Welding Health Hazards
Zinc Cadmium Beryllium
Iron Oxide Mercury Lead Fluorides
Chlorinatedhydrocarbon solvents
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
WeldingProcess
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 _____ feet from combustibles.
2. Shielding is a process used to protect
the eyes from welding fume. True or False3. Three physical welding hazards are ____________
radiation, infrared radiation and intense visible light.
4. You should not use oxygen as asubstitute for air. True or False
5. As long as they are secure, fuelcylinders can be stored on their side. True or False
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Quiz (cont.)
6. Gas Metal Arc Welding is alsoknown as _____________ welding.
7. Exposure to zinc fumes may cause
metal fume fever. True or False8. Cylinder inspection requirements are regulated
by the Department of ____________________.
9. Acetylene has a very narrow
flammable range. True or False
10. Backflow prevention should be provided for oxygen 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 away
from the weld.3. Three physical welding hazards are ultraviolet
radiation, infrared radiation, and intense visible light.
4. True. You should not use oxygen as a substitute
for air.
5. False. Fuel cylinders must always be stored upright.
6. Gas Metal Arc Welding is also known as MIG welding.
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Quiz Answers (cont.)
7. True. Exposure to zinc fumes may cause metalfume fever.
8. Cylinder inspection requirements are regulated
by the Department of Transportation.9. False. Acetylene has a very wide flammable range.
10. True. Backflow prevention should be provided for all oxygen cylinders.