August 29, 2013 Appears that you are talking about soldering metals to metals and not soldering to electrical components. If this is true, mechanical soldering requirements and not J-STD-001 soldering would normally apply. Is this a soldering or otherwise a brazing operation since many heat sinks are brazed to the copper pipes using dip braze or furnace brazed process rather than soldered. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE) Sent: Thursday, August 29, 2013 3:10 PM To: [log in to unmask] Subject: Re: [TN] Solder joint failure Usually a sacrificial gold is the final finish over the nickel. The fluxes used to solder to nickel are unique. IMHO, no-cleans; not allowed. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin Sent: Thursday, August 29, 2013 12:01 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________