Zhang

A retouch of a blowhole (unless it is really catastrophic) will probably
cause 5 times as much harm as it will do good.

Brian

Shoukai Zhang wrote:
>
> Hi folks,
>
> We encountered “blowholes” occurring on our PCB Assembly after wave
> soldering. And the cross-section pictures show out, there’s no void in the
> through-hole, and the excess solder(solder ball)on the soldering side of
> the board connects the inner solder of through-hole directly. Now I have
> some questions about the “blowhole”:
>
> 1. Is it real blowhole?
> 2. According to IPC standards, the process phenomena can be recognized as
> process-defect or process-indicator? And will you help to tell me the
> detailed lines in IPC which used for supporting your conclusion.
> 3. What’s your recommendation about the excess-solder reworking on the
> board? Or no need for reworking?
>
> If received your response, I can sent the picture to you respectively for
> your reference.
>
> Thanks in advance.
>
> Best regards,
> zhang shoukai
>
> PE, Huawei Technologies
>
> ---------------------------------------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
> ---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------