Chapter 7 –Other Welding Processesp2cdn4static.sharpschool.com/UserFiles/Servers/Server... ·...

Chapter 7 –Other

Welding Processes

Step 1: Secure

cylinders

Welding

By David J. Hoffman, Kevin R. Dahle, David J. Fisher

© 2012 Pearson Higher Education,

Upper Saddle River, NJ 07458. • All Rights Reserved.

2

Caution: Only use chain to

secure cylinders

Step 2: Crack

oxygen valve

Caution: Alw

ays “crack” or momentarily open the

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Caution: Alw

ays “crack” or momentarily open the

valve of a compressed gas cylinder before attaching

the regulator. M

ake sure the valve is not pointed

towards yourself or other individuals.

Cracking the cylinder valve clears foreign m

aterial

out of the valve seat. Foreign m

aterial may cause

damage to valve or regulator connections, which

can cause leaking.

Step 3: Attach

oxygen

regulator

Caution: Never use any petroleum based

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Caution: Never use any petroleum based

lubricant on any pure oxygen fitting, hose or

regulator.

Pure oxygen w

ill reduce the kindling

temperature of these lubricants to room

temperature

Step 4: Attach

acetylene

regulator

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Step 5: Attach flashback arrestors on

oxygen and acetylene regulators

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Step 6: Attach gas hoses.

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Step 7: Attach

torch.

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Step 8: Turn out

flow pressure

adjustm

ent screw

then open oxygen

valve

Caution: When first opening an oxygen cylinder valve

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Caution: When first opening an oxygen cylinder valve

alw

ays turn the valve 1/4 turn, wait several seconds

then open all the w

ay. This step allows the initial in

rush of pressure to the regulator to stabilize.

It is also important to stand to the side of the

regulator behind the valve. If the valve w

as to

explode the valve m

ay block some of the debris.

Step 9: Turn out

flow pressure

adjustm

ent screw

then open acetylene

valve

Caution: Only turn the valve a 1/2 to

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Caution: Only turn the valve a 1/2 to

3/4 turn. This w

ill allow quick shutting

of valve in case of a emergency.

If a w

rench or T handle is needed to

operate valve leave tool in place to also

allow quick shutting of the valve.

Step 10: Set

Oxygen operating

pressure (always

consult

manufactures

recommended

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11

recommended

pressure settings)

Step 10: Set

Acetylene

operating pressure

(always consult

manufactures

recommended

Caution: Never use

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recommended

pressure settings)

Caution: Never use

acetylene at

pressures greater

than 15 psi (103kPa).

Never exceed the

withdrawal limits of

the acetylene

cylinder.

Step 11: Put on

personal protective

equipment

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1.

Step 12: Purge

oxygen and

acetylene lines.

Then double check

pressure settings.

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1.

Caution: Purging both lines will eliminate any

mixed gases from torch. Gases can become

mixed if torch was incorrectly shut down the

last time it was used.

Step 13: Open

acetylene torch

valve and light

torch.

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Caution: Only use friction style lighters to light a

torch.

Never use a lighter, m

atches or other torch to light

torch.

Step 14: Open torch

oxygen valve.

Adjust acetylene

and oxygen valve

until a neutral flame

is achieved.

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Step 1: Turn off torch

oxygen valve first

(consult

manufactures

recommendations)

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1.

Step 2: Turn off

torch acetylene

valve (consult

manufactures

recommendations)

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1.

1.

Step 3: Close Oxygen and Acetylene

cylinder valves.

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Step 4: Purge oxygen

and acetylene lines.

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1.

Step 5: Turn out flow pressure adjustm

ent

screws.

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