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by ipc.org (Smail3.1.28.1 #2)
id m0vS5AY-0000TUC; Mon, 25 Nov 96 11:50 CST |
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Mon, 25 Nov 1996 12:58:22 -0500 |
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| From [log in to unmask] Tue Dec 3 10: |
01:00 1996 |
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<"ifJXO1.0.XL7.GnTco"@ipc> |
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hello technet
the mostly discussed problem of the plasic range of 60/40 solder can be
answered in two statements
--- the eutectic point is at 61.9 weight percent tin (Thaddeus B Massalski
Binary Alloy Phase Diagrams ASM)
--- binary phase diagrams show the constitution of alloys at the
equilibrium
after a very slow cooling rate
during a technical cooling (soldering) the cooling speed is so high
that you cannot notice a plastic range.
Karl Ring
ZVE
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