Which outcome occurs during flash butt welding of prestressed concrete beam rebar subjected to rapid heating?

A)Grain growth reduces fatigue strength✓

B)Prestressing force increases uncontrollably

C)Electrode oxidation prevents sound welding

D)Cooling rate ensures material hardening

💡 Explanation

Grain growth drastically lowers the fatigue strength because rapid thermal cycling induces excessive grain boundary migrations which impact material tenacity. Therefore fatigue resistance plummets, rather than improving, because of the material's altered microstructure under heating and subsequent cooling which favors rapid grain rearrangement.

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Which outcome occurs during flash butt welding of prestressed concrete beam rebar subjected to rapid heating?

💡 Explanation

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