Alloy steels: oxyacetylene preheating

In the oxyacetylene preheating of alloy steels for welding with shielded electrode, why always avoid the carburetant flame? Explain.

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  • Because the burning of the acetylene (C2H2) in the flame diffuses free C to the steel surface, it increases the C content of the steel and can create microvolumes of martensite and consequent surface microcracks in rapid cooling.
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