Entrenamiento en Seguridad de Soldadura

8/22/2019 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.

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