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 ---------------------------------------------------------------------------------