I agree. The flux makes a big difference. I regularly solder to nickel tabs that are spot welded to battery cells. I played with various flux materials, the thick RMA flux from flux pens has worked best. I have also solder coated by dipping in a solder pot, that RMA works well. This always concerned me about ENIG, once the gold is dissolved off the surface what happens next? Bob K. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin Sent: Thursday, August 29, 2013 3:01 PM To: [log in to unmask] Subject: Re: [TN] Solder joint failure In my experience nickel is NOT easy to solder to at all. -----Original Message----- From: Victor Hernandez [mailto:[log in to unmask]] Sent: Thursday, August 29, 2013 2:53 PM To: [log in to unmask] Subject: [TN] Solder joint failure Fellow TechNetters: Should I be concern with an electroless matted nickel plating over an aluminum sheet metal surface and solder onto a copper heat tube? I recall something about directly soldering onto a nickel surface. Beside nickel oxidation. Any suggestions would be greatly appreciated. Victor, ______________________________________________________________________ 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________