Aluminium Quality Crossword

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Across
  1. 2. Visual surface line defect
  2. 3. Aluminium mixed with other elements
  3. 6. process of checking product quality
  4. 7. Measurement of sheet thickness
  5. 10. Heat treatment process to improve strength
  6. 11. Tool used to measure thickness
  7. 13. Undesired gap or hollow in casting
Down
  1. 1. Property of aluminium being lightweight
  2. 2. Resistance to breaking under force
  3. 4. Thin layer that protects aluminium from corrosion
  4. 5. Surface defect with small holes
  5. 8. Chemical process to increase corrosion resistance
  6. 9. Element added to improve aluminium strength
  7. 12. Surface defect caused by trapped gas bubbles