Hi Arjun, It seems that the amount of flux deposited or the evenness across the board, is likely to be the causes for the solder-short as you have mentioned that it is better with the foam fluxer. Try using fax paper and paste it on a glass slide or wave-level gauge, allow the waxy side of the fax paper to face against the spray. Turn off the preheat & the wave and pass the glass thru' the machine. Check the uniformity and also the coverage. It may due to the spray-fluxer stops spraying slightly earlier before the board is completely travelled thru' the spray-head or uneven application on the board. The solder balls formation may due to insufficient pre-heat, or improper wave-hgt adjustment.. Good Luck .. Poh ---------------------------------------------------------------------------- ------------------ At 02:45 PM 7/11/97, [log in to unmask] wrote: > > > > > > Hello Fellow Internetters, > I work for ERG telecommunications, in Perth, Australia. > We have been seeing problems with the wave solder process,with two > defect types ie. Bridging (approx 12%) and solder balling(Approx 2%). > Bridging has the higher rate of the two problems. > The location that the bridging problem occurs is mainly at the front > of the boards as they pass the wave machine. Also bridging is mainly > the trailing edge type but, there are instances when it bridges > across the board.. > The machine that is used, has the capability of spray and foam > fluxing. Alternating between these two fluxing types, I observed that > the foam fluxing gives better results, in most cases at 0% defect > rate. My concern with changing to foam fluxing is that the residual > contamination left after such a process is high( i am yet to test some > boards with a Ionic contamination tester). The flux that is used is > halide free Multicore X32-10i. > > Does anyone have any suggestions to reduce such wave solder problems ? > > Regards > Arjun Murthy > > [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] * >*************************************************************************** > > *************************************************************************** * 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] * ***************************************************************************