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← TechnologyWhich outcome occurs in welded steel structures when lamellar tearing initiates?
A)Reduced tensile strength perpendicular to weld✓
B)Increased fatigue resistance at joints
C)Enhanced ductility within the fusion zone
D)Improved corrosion resistance near the heat-affected zone
💡 Explanation
Increased sulfur content causes hydrogen embrittlement, initiating lamellar tearing and brittle cracks because hydrogen diffuses to grain boundaries. This weakens the steel's tensile strength perpendicular to the weld’s plane, therefore reducing structural safety, rather than boosting fatigue or corrosion resistance.
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