Practice question

In oxy-acetylene welding practice for automotive joints, a neutral flame is characterised by:

  1. Oxygen completely shut off so only acetylene burns at the tip
  2. Acetylene completely shut off so only pure oxygen exits
  3. Approximately equal acetylene and oxygen resulting in a well-defined inner cone without excess acetylene feather
  4. Using compressed air instead of both gases

Answer: C — Approximately equal acetylene and oxygen resulting in a well-defined inner cone without excess acetylene feather

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