Oxy/Acetylene Flashcards
What is meant by dissolved acetylene?
If acetylene is compressed into a cylinder, it would explode under high pressure. Acetylene cylinders are packed with a porous material that is filled with acetone, this can absorb 25 times its own volume of acetylene. Dissolved acetylene is the name given to this form of acetylene fuel.
Describe the three flames shown.
Outline an application for each flame.
A = Neutral flame -equal portions of both gases –3100 degrees –Used to weld steel
B = Oxidising flame -excess oxygen –3250 degrees –Used to braze/solder
C = Carburising flame -excess acetylene –2950 degrees –Surface hardens steel
Compare primary and secondary combustion in the oxy-acetylene flame.
The primary zone is the inner and hotter zone. It is where the oxygen and acetylene burn. This part of the flame is used for the welding.The secondary zone is where the oxygen in the surounding air is used to create an outer flame. This part of the flame is used to pre-heat the weld area.
State three safety precautions associated with oxy-acetylene welding.
Heat from flame–Wear protective clothing
UV radiation from flame –Wear goggles and protective clothing
Smoke/gases from flame –Use in well ventilated area
List two safety features incorporated into the Oxy-Acetylene equipment.
The colour coding on the cylinders and the hoses helps prevent any possible mix-up of the gases and connections.
The oxygen cylinder is usually thinner and taller than the acetylene cylinder.
The connections for the different gases have either left or right-hand thread forms.
The flashback arrestors prevent the flame from returning to the cylinders.
Cylinders can be turned off when finished operating the equipment.
