Which consequence results when excessive, localized heat during welding weakens steel I-beams?

💡 Explanation

Formation of tempered martensite increases brittleness due to rapid heating and cooling during welding. This localized phase transformation results in harder but more brittle regions, because the rapid quench prevents formation of ductile microstructures therefore raising crack propagation rates in the heat affected zone, rather than improving strength.

• Which outcome occurs when harmonic currents increase in a power distribution circuit connected to variable frequency drives?
• Which risk increases when epoxy-bonded carbon fiber reinforcement is improperly applied to a concrete beam?
• Which outcome is LEAST likely following the complete oxidative degradation of epoxy coating reinforcing a pre-stressed concrete beam near a marine environment?
• Which risk increases when operating a reciprocating air compressor's crankshaft beyond its rated speed?
• Which outcome occurs when a robotic arm's limit switch malfunctions, sending unexpected signals to the PLC?
• Which risk increases when submersible pump bearings operate without adequate lubrication at depth?