Brian, I seem to remember hearing somewhere that lead-free solder joints, especially ones that are fairly large solder joints, may show a higher amount of cracks in the surface than SnPb joints of the same size. (I think the reasons had to do with amount of thermal expansion and contraction, and cooling rates??) I don't know if those types of surface cracks would be the same or look the same as solder stress lines, but that could be part of the explanation. I also know that many of the lead-free solders have a duller appearance than SnPb solder and that has been an issue for QA people who are switching from SnPb solder and are used to seeing smooth, bright and shiny solder joints. -Camille Good Portland, Oregon P.S. You may want to contact someone on the IPC committee that wrote IPC-A-610D. They should have more information.
Brian O'Connell <[email protected]> wrote: Good People, I am performing a quality review on an unit based on IPC-A-610D. Section 5.2.7 indicates that solder stress lines are acceptable for lead-free solders, but not for leaded solders. Does this make sense to anyone ? What great revelation am I missing ? Thanks and luck, Brian - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
