OXY ACETYLENE WELDING 1

to ignite the flame on Oxy Acetylene Gas Welding, I must first..

• switch on Oxygen Gas

• switch on both Acetylene and Oxygen Gas

• switch on Acetylene Gas

• switch on either Oxygen Gas or Acetylene Gas, it doesn't matter

When first switching on Oxy Acetylene Gas Welding, add Acetylene gas until..

• smoke appears from the flame

• cone is seen at the tip

• smoke is minimal and flame is feathered

• flame turns blue

What are the different Flames in Oxy Acetylene Gas Welding?

• Natural Flame

• Oxidising Flame

• Reducing / Carburising Flame

• Oxygen Flame

• Neutral Flame

What is the mixture of Neutral Flame?

• Oxygen > Acetylene

• Oxygen = Acetylene

• Oxygen < Acetylene

• Oxygen Only

If the cone is SHARP and the torch is NOISY, it is..

• Reducing Flame

• Carburising Flame

• Neutral Flame

• Oxidising Flame

OXYGEN GAS is a power gas, because..

• It is flammable

• It controls the strength of the flame

• it is colourless and non flammable

• It is strong

Why do we use Neutral Flame in Gas welding?

• Because it is quiet and easy to work with

• Because it is the cleanest and the hottest flame

• Because the cone is sharp

• Because Neutral Flame is unstable

When switching off Oxy Acetylene Gas Welding, I must..

• swtich off Oxygen first, then Acetylene Gas

• switch off Acetylene First, then Oxygen Gas

• switch off both gases at the same time

• switch off the regulator

When shutting down the system, why must we switch off Acetylene Gas first?

• So that Oxygen can clean the nozzle tip

• Because Acetylene is an expensive gas

• So that fire doesn't go inside and down the torch

• Because Oxygen is Flammable

What colour is Acetylene Gas Cylinder?

• Black

• Silver

• Maroon / Red

• Blue