Cleanliness levels for rework are the same as for production. Attempting to remove no-clean flux residue can be very risky, much worse than leaving it alone. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Thierolf, Chris @ MPSG - SPD Sent: Thursday, October 29, 2015 7:44 PM To: [log in to unmask] Subject: [TN] Pierced Terminal I'm seeking some input to a solder condition that gets scrutinized in many directions. For the soldering of a stranded 10-12awg stranded wire to a pierced resistor terminal, a no clean L0 or L1 (RO/RE) flux is used with 63/37 solder. This is a single solder joint on a panel mount resistor, so no PCB involved. Flux residue is observed and assembly rejected by QC but manufacturer claims its no worry, and no clean flux. My observation says it presents no electrical or operational issue, not a violation of J-STD-001, but perhaps a visual issue per IPC-A-610, sec 10.6.4 "Flux residue inhibits visual inspection" if floor inspector claims he cannot see the solder joint clearly, which has occurred. We can state "clean the solder joint" (relatively speaking), but what really is clean in this case? Should we be forced to inspect these joints with 4x mag, as some are doing, or generate a simple guideline that allows residue up to a certain level? What is this level? I have a picture of a failed solder joint if interested, but not sure where to upload. ______________________________________ [Disc3.png] Chris Thierolf Principal EE and Project Engineer L-3 Electronic Systems Segment SPD Electrical Systems 13500 Roosevelt Boulevard Philadelphia, PA 19116 Phone: (215) 698-6390 Fax: (215) 677-4736 ________________________________ CONFIDENTIALITY NOTE: This electronic transmission, including all attachments, is directed in confidence solely to the person(s) to whom it is addressed, or an authorized recipient, and may not otherwise be distributed, copied or disclosed. The contents of the transmission may also be subject to intellectual property rights and all such rights are expressly claimed and are not waived. Unless specifically modified by L-3 SPD Electrical Systems , the content of this electronic transmission is to be read subject to L-3 SPD Electrical Systems standard terms of business. This electronic transmission may be intercepted or affected by viruses and L-3 SPD Electrical Systems accepts no responsibility for any interception or liability for any form of viruses introduced by this electronic transmission. If you have received this transmission in error, please notify the sender immediately by return electronic transmission and then immediately delete this transmission, including all attachments, without copying, distributing or disclosing same. ITAR CONTROL STATEMENT: In the event this document (or any of the enclosures) contains technical data within the definition of the International Traffic in Arms Regulations or Export Administration Regulations, it is subject to the export control laws of the U.S. Government. Transfer of this data by any means to a foreign person, whether in the United States or abroad, without an export license or other approval from the U.S. Department of State or Commerce, is prohibited. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________