Hi Inge! Nickel is pretty lossy, so you could possibly heat with electrical energy. Still lots of current required--probably on the order of 100A/mm of nickel. Nickel doesn't conduct heat real well either, so you would want to drive the current pretty close to where the solder needs to be melted. I'll bet a few days of playing with an arc welding power supply would get you a process. Or you could just use a car battery and some jumper cables and see what happens! Problem I see with this technique might be package warpage due to differential coeff of expansion and the local heat, similar to problems of using a torch, but the electrical would have much better control. Wayne Thayer -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Wednesday, September 24, 2008 10:46 AM To: [log in to unmask] Subject: Re: [TN] Soldering SMA to heavy RF packages, need advice Mike, THAT was new to me! Good start, I'd say, many thanks. Hope our machine can manage 260 C. Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Sewell Sent: den 24 september 2008 16:33 To: [log in to unmask] Subject: Re: [TN] Soldering SMA to heavy RF packages, need advice Inge, Galden makes fluids that go to 260C... http://www.solvaysolexis.com/static/wma/pdf/9/7/7/0/Galden%20VPS.pdf Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Wednesday, September 24, 2008 9:26 AM To: [log in to unmask] Subject: [TN] Soldering SMA to heavy RF packages, need advice TNetters godday. Target is very large metal packages with bright nickel finish. Imagine soldering hermetic feedtrues. Nickel needs higher temperature and longer exposure time than copper, silver, gold and other metals. Vapour phase soldering is maximum 218 Centigrades, which I believe is not high enough. Iron soldering is not practical for launches. IR oven could be an idea if we add protection gas. Hot gas stations (Nitrogen)seem to be too lame. Resistance soldering not tested, unknown for SMA. Torch heard of, ought to be impractical, will burn flux and miscolor package. Laser soldering not practised. Anyone out there with experience from this kind of soldering? 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