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yangbin-1987(½ð±Ò+1): 2010-11-24 21:25:51
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yangbin-1987(½ð±Ò+1): 2010-11-24 21:25:54
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lingzhicao

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Originally posted by ¹ú²ú¿Æ±È at 2010-11-24 20:09:22:
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yangbin-1987

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zgw318

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yangbin-1987(½ð±Ò+2): 2010-11-25 17:19:00
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yangbin-1987

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Originally posted by zgw318 at 2010-11-25 13:42:12:
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zgw318

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Originally posted by yangbin-1987 at 2010-11-25 17:22:36:

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yangbin-1987(½ð±Ò+2): 2010-11-27 02:46:23
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Originally posted by yangbin-1987 at 2010-11-24 16:58:35:
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I guess there are two possibilities: (i) silicon mark and (ii) black line. The first one is due to heterogeneous spatial distribution of Si and/or Mg containing particles, i.e., the dark band contains much more Si, Mg particles than elsewhere. This is a defect of casting and homogenization. You really cannot do anything, but you can complain your supplier. The second one is due to local high pressure and/or high temperature during extrusion. Again, you cannot do anything, but you can modify your extrusion condition to avoid the same problem next time.
11Â¥2010-11-26 07:33:52
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google7723

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yaxv

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