CCM Billet Defect

CCM

CCM

CCM

11) False wall )Doubleteem) ( ()transversal interruption of the skin( .

12) Plating( )Solidified metal at the meniscus later entrapped into the skin .

13) False face (Skin transversal interruption due to separation of skin from bar in the forming stage)

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14) Surface Slag( )

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15) Heavy oscillation marks ( )

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16) Healed breakouts ( ): (Solidified metal in the mold after a breakout)

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17) Foldings and cold weldings ( ): (Molten metal solidified on solid skin in the mold) .

18) Aluminum surface deposits (clots)( ): (Normally longitudinally lined up) .

Internal Defects ( )1) Star cracks ( ):

Macrotching .

2) Internal cracks often associated to superficial depression ( )

Macrotching .

3) Central area cracks ( ):

Macrotching .

4) Macro inclusions: larger than 80 micron ( )

Macrotching . .

5) Central unsoundness: cavity or porosity in the central area ( )

Macrotching .

6) Blowholes ( ): )subcutaneous flows made by escaping gases(

Macrotching .

Shape Defects ( ): 1) Rhomoidity( ):)Inequality of diagonal in square or rectangular products(

. Rhomoidity : R= (D-d/ D)*100:R = D = d =

2) Concavity():)Concave distortion of one or more faces in squares or rectangular(

. .

3) Bulging( ): (Convex distortion of one or more faces in square or rectangular products)

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Eng/ Waleed Hassanein 16Eng/ Ibrahim 3lwany [email protected]