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Date: | Thu, 9 Dec 2010 17:03:55 +0800 |
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Dear Nancy
我司目前是以第一種方式做管控.因為這才能管制總含量中各成分
的差異值.
BR
Leo
-----Original Message-----
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Nancy Deng
Sent: Thursday, December 09, 2010 4:07 PM
To: [log in to unmask]
Subject: Re: [TGAsia] Non-RoHS 焊锡中含锡量的规格 理解
Hi,all:
Any comments or suggestion share with me?
Best regards and thanks
Nancy Deng
-----Original Message-----
From: Nancy Deng
Sent: Thursday, December 09, 2010 1:04 PM
To: [log in to unmask]
Subject: Non-RoHS 焊锡中含锡量的规格理解
Hi, all:
在J-STD-001 中定义Non-RoHS 焊锡中含锡量的规格如下:
“对于用于预处理或组装的锡铅合金,其含锡量应当维持在所用合金标称值的±1%以内。”
我确认过英文版本,中英文的表达是一致的。
以常用的Sn63Pb37焊料为例,对于含锡量,我们目前有两种理解:
1。 63%Sn 的±1%变化,含锡量的规格下限为63%*(100%-1%)=62.37%; 规格上限为63%*(100%+1%)=63.63%; 所以规格为62.37%---63.63%
2。63%Sn ±1%变化。含锡量的规格下限为63%-1%=62%; 规格上限为63%+1%=64%; 所以规格为62%---64%
不知哪种理解忠实于标准,请各位不吝赐教!
Best regards and thanks
Nancy Deng
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