Oxygen Acetylene Equipment

• Oxygen = Green• Acetylene = Red

Neutral Flame

• Neutral Flame– Used in brazing and OAW (oxygen acetylene

welding)– Equal amounts of oxygen and acetylene

Oxygen Tank

• Holds Oxygen• Green• Full tank = 2200 psi

Acetylene Tank

• Holds Acetylene• Red or Blue• Full tank = 250 psi

Tank Valves

• Open and close tanks• Open oxygen tank all the way• Open acetylene tank no more than 1 turn

Regulators

• Attached to tank valve• Used to deliver low pressure to torch• 2 gauges: tank pressure / line pressure

Hoses

• Attached to regulators• Red = Acetylene(5psi)• Green = Oxygen(10psi)• Deliver gases to torch

Torch Valves/Needle Valves

• Used to adjust the flame• Righty tighty(closes valve)• Lefty loosy(opens valve)

Torch

Attached to hosesMixes the gasesProvides a handle to hold the torch and control

the flame

Torch Tip

• Various sizes• 00 – 5• Higher the number, bigger/hotter flame• We will use 0 or 1

Brazing

Brazing

-Hard soldering-Do not melt base metal-Adhesion-Done at above 800’F

Safety Equipment

-Gloves-Safety glasses-Hair tie-Long sleeves-Face shield # 3 lens-Leather jacket-Leather apron

Brazing Rod

-Non ferrous filler rod-Brass rod-Copper & Zinc

Flux

-Chemically cleans metal

Striker

-used to light the torch-Never use a match-Never use a lighter (unless you want to blow your hand off…)-Never light off of another torch

Lighting and adjusting a torch(Setting a neutral flame)

1-Open Acetylene valve ¼ turn 2-Use striker to ignite3-Open Acetylene valve till smoke goes away and flame starts to dance4-Open oxygen valve until feather turns into a cone

Shutting Down

1-Righty-tighty2-Close oxygen valve first3-then close acetylene4-make sure the flame goes out completely

Backfire

-Flame goes out with a loud pop -Caused by flame going out suddenly

-Causes of Backfire -Tip too dirty (Obstruction in the welding tip)

-Torch touches the work piece-Adjustment of flame is set too low or incorrect-Dirty metal-Damaged or loose tip-Tip is overheated

Flashback

-Flame burns back inside the tip, the torch and the hose

-Causes of Flashback -Backfire-Procedure to Follow -Turn off torch valves

-Clean tip