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Reducing flame is obtained in oxyactetylane welding with
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excess of acetylene
💡 Explanation:
A reducing flame (also called carburizing flame) in oxyacetylene welding is obtained with excess acetylene. This flame has an inner cone, a feathered intermediate zone, and an outer flame, characterized by a deficiency of oxygen which prevents the burning of all available acetylene, creating a reducing atmosphere that prevents oxidation.