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← TechnologyWhich risk increases when sand casting aluminum-silicon alloy components near a weld?
A)Rapid oxidation during the anneal
B)Dendritic arm spacing increases greatly
C)Severity of micro-porosity concentrates there✓
D)Alloy segregation precipitates are eliminated
💡 Explanation
Micro-porosity exacerbates around heat-affected zones because differential cooling affects solidification. Therefore, concentrated defects exist near the weld area, rather than uniform porosity elsewhere due to controlled cooling rates in the mold away from the weld.
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