Describe each of the following oxy-acetylene flames:
(i) Neutral flame - Leaving Cert Engineering - Question a - 2016
Question a
Describe each of the following oxy-acetylene flames:
(i) Neutral flame.
(ii) Oxidising flame.
(iii) Carburising flame.
Worked Solution & Example Answer:Describe each of the following oxy-acetylene flames:
(i) Neutral flame - Leaving Cert Engineering - Question a - 2016
Step 1
Neutral flame
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Answer
A neutral flame has equal proportions of acetylene and oxygen, which provides a balanced combustion. It is characterized by a rounded inner cone and is used primarily for general welding tasks.
Step 2
Oxidising flame
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Answer
An oxidising flame contains more oxygen than acetylene. It can be identified by its pointed inner blue cone and is mainly used for brazing and welding of brasses, where a higher temperature is required.
Step 3
Carburising flame
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Answer
A carburising flame has a greater ratio of acetylene than oxygen. It is recognized by an additional feather on the inner cone. The excess acetylene can be used to add carbon to a mild steel welded joint, which enhances hardness.
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