Hi Maurice - Take a look at the solderability of the boards. You may have pads where the nickel underplate has diffused to the pad surface via the gold grain boundaries or porosity in the gold finish. Check out "Assessment of Circuit Board Surface Finishes for Electronic Assembly with Lead free Solders" by Dr.U. Ray, et all, SMI 96 Proceedings page 656 for more info. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: ass- gold/Ni solder skips Author: [log in to unmask] at ccmgw1 Date: 3/27/97 9:16 AM Date 27/3/97 Subject ass- gold/Ni solder skips >From Maurice Dore To Tech net ass: gold/Ni solder skips Hi I'm wave soldering a board with gold/nickel finish and I've recently seen some bizarre incidents of certain pads entirely not wetting, some with a slight degree of wetting and the majority showing very good wetting. I have a gut feeling that it's related to variation of temperature in the solder bath but I really am not sure why its recently started happening. Any opinions welcome. Thanks in advance. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************