Paul: Anytime I've seen volcanic type voids as you have described generally points to moisture trapped inside the board near the plated thru hole. Try baking a board for a couple of hours at 225° - 250°F, then re-run. If the problem persists then all I can say is that there are volitiles trapped inside your PWB and nothing can be done to remove them except to talk to your board supplier. (or find a new one !) Bill Kasprzak Moog Inc. > -----Original Message----- > From: Paul Tomlinson [SMTP:[log in to unmask]] > Sent: Wednesday, November 10, 1999 10:57 AM > To: [log in to unmask] > Subject: [TN] Voids after Wave-Soldering! > > Hi folks, > > I am just learning about these matters, and this is THE place where > knowledge and experience abounds so please somebody help me with this. > > > I have just had my first ever boards waved and the results are not > encouraging. What could be the cause of a volcano shaped void between the > component leads being soldered and the main body of the solder? > > > There is perfect continuity, the area at the tip and that around the board > are well wetted, but mechanically the joints are very weak and prone to > failure, the parts can actually be pulled out of the board without being > damage. > > > Could this be simply the result of a too low temperatured wave? They used > 465F. > > | | > | | > | | > --------------------- | | ------------------- > | | | | > | | | | > | | | | > --------------------- | | ------------------- > * * | | * * > * *V | | V * * > * * O | | O * * > * * I | | I * * > * * D | | D * * > * * | | * * > * * | | * * > * *| | * * > * | | * > *| |* > --------- > > This ASCII art is extremely crude so I have attached both JPG and BMP > files > of a much better drawing. > > Tia, > > Paul. << File: lead.bmp >> << File: lead.jpg >> << File: ATT15807.txt >> > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################