我们用过一段时间，但是在2个月前我们就取消使用这个东西了
很多有经验的朋友告诉我有以下一些情况都可能造成这种不良
1、锡渣被泵带入锡槽打出导致
我们已经两小时清理一次，而且波峰我们一直设置在1200左右(设备最高1400),所以
如果这个是根本原因，那到底如何解决啊？
2、锡渣清理不及时
我们有波峰焊作业指导书，而且也确实有进行及时地清理，两小时一次。
3、锡炉温度设置过高
锡炉温度我们曾经调节到245摄氏度过，但是这种短路不良依然频繁发生
4、助焊剂没有挥发完全或者有杂质附着导致
我们使用的是Interflux的无VOC的有机酸助焊剂，应该不会导致这种问题啊
5、锡炉里的锡的杂质成分超标
我们08年11月底对锡成分让第三方做过分析，具体如下，跟标准相比较，好像没有什
么元素超标阿
另该不良在PAD稍密集的地方均有可能产生，很离散。
以上这些情况我逐一检查后还是没有找到根据解决办法啊，很迷茫阿 Wisdom，你们
也发生过，那证明现在应该没有了对吗？那你们是怎么解决这个问题的呢?
请专家们指教阿，谢谢了......
Zejun Yang | ME| APC-MGE Critical Power and Cooling Services Division,
Schneider Electric.
No. 1678 Jixian Road, Tongan District, Xiamen, China 361100 *: Zejun
[log in to unmask]
(Tel) +86 592 757 2775 | (Mobile) +86 15980782161| (Fax) +86 592 757 2899
Wisdom Lu <[log in to unmask]>
Sent by: TGAsia <[log in to unmask]>
21/01/2009 09:24
Please respond to
Asia Committe Task Group Forum <[log in to unmask]>; Please respond to
[log in to unmask]
To
[log in to unmask]
cc
Subject
Re: [TGAsia] dross short
我们也发生过同样的问题.请问一下你们是否用还原锡,还原的锡带杂质是擦拭不掉的
.
Best Regards!
Wisdom
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Wednesday, January 21, 2009 9:09 AM
To: [log in to unmask]
Subject: Re: [TGAsia] dross short
Perform an overhaul in you wave soldering machine as there is lots of
dross within your solder-pot/pump. You wave height (pump height setting)
might also pump dross within the solder-pot.
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Yang Zejun
Sent: Wednesday, 21 January 2009 9:02 AM
To: [log in to unmask]
Subject: [TGAsia] dross short
不好意思，我可能没有描述清楚，不良图片和具体的制程参数如下，目前这种不良在
我们这里高达5%左右，真的很头疼阿，希望专家们能帮帮忙，谢谢了。
制程参数：
PCB: CEM-1 预热：92摄氏度(实测)
锡条：云南锡业SnPb6337 锡炉温度：254摄氏度(实测)
助焊剂：Interflux 精英IF2008 链条速度：1.2左右
锡炉里的锡渣我们2小时清理一次,锡的量严格控制在波峰未打开时离炉岗10mm以内。
图片中的短路部分不易发现，导致连锡部分在显微镜下观察表面有一层薄薄的像灰一
样的东西包裹，但是里面的东西必须用电烙铁才可以带开，这种不良有时候在FR4的
PCBA上也会发生
只要是PAD稍密集的地方就容易出现，很苦恼啊....
Zejun Yang | ME| APC-MGE Critical Power and Cooling Services Division,
Schneider Electric.
No. 1678 Jixian Road, Tongan District, Xiamen, China 361100 *: Zejun
[log in to unmask]
(Tel) +86 592 757 2775 | (Mobile) +86 15980782161| (Fax) +86 592 757 2899
James Liu <[log in to unmask]>
20/01/2009 23:04
To
Asia Committe Task Group Forum <[log in to unmask]>, "[log in to unmask]"
<[log in to unmask]>
cc
Subject
答复: [TGAsia] 答复: [TGAsia] 关于检验光的要求 ！
我不明白你的问题。可否有照片？锡丝怎么会短路？
Best Regards,
James Liu 刘春光
Director, Technology & Standardization 技术与标准总监
IPC China
上海市长宁区延安西路1088号2303室
Suite 2303，#1088 West Yan'an Rd., Changning, Shanghai 200052 PRC
Tel: +86 21 5497 3435
Fax: +86 21 5497 3437
MP: +86 136 0133 3491
[log in to unmask]<mailto:[log in to unmask]>
www.ipc.org.cn<http://www.ipc.org.cn>
________________________________
发件人: TGAsia [[log in to unmask]] 代表 Yang Zejun [[log in to unmask]]
发送时间: 2009年1月20日 11:37
收件人: [log in to unmask]
主题: Re: [TGAsia] 答复: [TGAsia] 关于检验光的要求 ！
大家好，我想请问一下锡丝短路怎么处理啊？很细很细的那种。
Zejun Yang | ME| APC-MGE Critical Power and Cooling Services Division,
Schneider Electric.
No. 1678 Jixian Road, Tongan District, Xiamen, China 361100 *: Zejun
[log in to unmask]
(Tel) +86 592 757 2775 | (Mobile) +86 15980782161| (Fax) +86 592 757 2899
Mike Ning <[log in to unmask]>
Sent by: TGAsia <[log in to unmask]>
20/01/2009 11:28
Please respond to
Asia Committe Task Group Forum <[log in to unmask]>; Please respond to
Mike Ning <[log in to unmask]>
To
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cc
Subject
[TGAsia] 答复: [TGAsia] 关于检验光的要求！
IPC-610D 和IPC-620A中前言部分有要求：
1.16 Visual Inspection
1.16.1 Lighting Illumination at the surface of workstations should be 1000
lm/m2 minimum. 1,000 lm/m 2 at the work surface is the accepted practice
for the minimum level of illumination in which operators and inspectors
should be expected to perform their tasks. 1,000 lm/m 2 is approximately
equivalent to 100 foot-candles measured using a photographic light meter.
1.16.2 Magnification Aids and Lighting When required, magnification power
for assembly inspection shall1 be at least the minimum inspection power
specified in Table 1-2. Other magnification powers within the inspection
range may be used. The magnification power requirement is based on the
gauge of the wire being inspected. For assemblies with mixed wire sizes,
the greater magnification may be used for the entire assembly. If the
presence of a defect cannot be determined at the inspection power, the
item is acceptable. The referee magnification power is intended for use
only after a defect has been determined but is not completely identifiable
at the inspection power.
The tolerance for magnification aids is ± 15% of the selected
magnification power. Magnification aids should be maintained and
calibrated as appropriate (see IPC-OI-645). Supplemental lighting may be
necessary to assist in visual assessment.
Table 1-2 Magnification Aids1
Wire Size AWG
Diameter mm [inch]
Magnification Power
Inspection
Range
Maximum Referee
larger than 14 AWG
2 mm [0.081 in]
N/A
1.75X
14 to 22 AWG
1.6 - 0.63 mm [0.064 to 0.025 in]
1.5X - 3X
4X
smaller than 22 AWG
<0.63mm [<0.025]
3 – 7.5X
10X
Note 1: Referee magnification power is to be used only to verify a product
rejected at the inspection magnification. For assemblies with mixed wire
size, the greater magnification may be (but is not required to be) used
for the entire assembly.
Best Regards,
Mike Ning
Sanbor Xiamen Manufacturing, Inc.
3/4F, 47 South Haijingnan 2nd Rd, Haicang , Xiamen AEPZ, China.
Post: 361026
Tel :+86-592-5099000 ext 8305
Fax:+86-592-5099343
www.sanbor.com
________________________________
发件人: TGAsia [mailto:[log in to unmask]] 代表 WTSZ-Anny Zhou
发送时间: 2009年1月20日 11:08
收件人: [log in to unmask]
主题: [TGAsia] 关于检验光的要求！
[cid:_2_05639D0405639AB00013ED0A48257544]
Dear all.
大家好，我想问一下IPC有没有对检验工位的灯光和环境有明确规定的？
∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽
Best Regards ^⊥^
anny zhou
Welco（Suzhou）
* Phone: 86-512-62838860 ext. 8116
* Fax: 86-512-62830728
* E-Mail: [log in to unmask]<mailto:[log in to unmask]>
∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽∽
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