safety ttraining presentation.ppt

8/10/2019 Safety tTraining Presentation.ppt

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11006115 Copyright Business & Legal Reports, Inc.

Journeyman Welding &Piping Services

Safety Training Presentations

Welding, Cutting and Brazing29 CFR 1910, Subpart Q


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Covered in Subpart H, but an integralpart of welding, cutting, and brazing

Compressed gas hazards

Gases used for cutting, brazing,and shielding 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

Neverweldin 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

Keep 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 forOxyacetylene Welding

Blow out cylinder valve

Release regulator

Stand to one side of regulator

Open cylinder valve slowly

Not more than 15 psi



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



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 or5 feet with a 1/2 hour fire barrier

Storage of Fuel Cylinders



Never lift cylinders by the service valve orvalve protection (use slings, net, etc.)

Keys, handles, hand wheels must be present

Use proper regulator

Open acetylene valve no more than 11/2turns

Gas Cylinder Precautions



Protective Devices

Pressure relief valves

Backflow preventers

Fuel gas hosered (sometimes black)

Oxygen hosegreen

Hose protection required

Pressure-reducing regulators



Arc Welding

Electric current fusesparent metal andwelding rod

Indispensable inmetal working

Used for carbon andalloy steels and non-ferrous metals



Air must be kept away from weld area

Shielding protects the integrity of theweld joint

Flux or gas mixture is used as a shield

Shielding



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



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




Welding Physical Hazards

Ultraviolet radiation

Infrared radiation

Intense visible light

L Sh d



Lens Shadesfor Typical Welding

WeldingProcess

Shielded metal arc

Gas metal arc

Gas Tungsten arc

Torch brazing

Gas welding

Lens ShadeNumber

10-14

11-12

12

3 or 4

4-8



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



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 beprovided for oxygen cylinders. True or False



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 forall oxygen cylinders.

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