Par.6.5.2. of IPC-A-610C: Acceptable-Class 1,2,3 -Exposed copper on vertical conductor edges -Exposed basis metal at ends of component leads But... The picture shows exposed copper alloy of lead base matrial. What's the catch??? Gaby > ---------- > From: Rick Howieson[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;Rick Howieson > Sent: ?יום שני 29 ינואר 2001? 16:33 > To: [log in to unmask] > Subject: Re: [TN] fractured joints > > Careful Doug...nowhere does the spec indicate trimmed leads must be > covered > with solder. An example, how would YOU explain the acceptability of an > exposed vertical trace on a board that has been SnPb plated and fused? > Rick > > -----Original Message----- > From: Douglas Pauls [mailto:[log in to unmask]] > Sent: Monday, January 29, 2001 7:01 AM > To: [log in to unmask] > Subject: Re: [TN] fractured joints > > > The IPC standard states that all clipped leads must either be reflowed or > checked under 10X magnification. Is this just a standard for single sided > boards? If you have a double sided board and a good fillet on the > component side of the board and you clipped the leads on the solder side > what would be the cause of concern if a joint is fractured on the solder > side? > > *One of the reasons that the specifications want you to check the clipped > leads, or better yet, reflow the solder to cover the clipped lead is so > that you cover the exposed metal of the lead which may corrode. I have > seen many cases where a ferrous core of the lead is exposed by the > clipping > process, which then corrodes in service. If that exposed metal was > covered > with tin-lead, that corrosion does not occur. > > Not quite what you were looking for, but something to think about. > > Doug Pauls > Rockwell Collins > > > -------------------------------------------------------------------------- > -- > ----- > 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 > -------------------------------------------------------------------------- > ------- >