Originally posted by hotrodmustang
well thanks all for the feedback. I guess I should have gave a little more information. I am experianced in the plumbing soldering trade and I am using the same flux my solder is lead free and contains 4% silver also I am using my propane torch. But there is a problem with the heat thing I'm trying to solder a piece of brass tube to the end of my tailwheel gear just above the nylon mount and am afraid of melting the nylon. I've kept the nylon out of the flame but still have slightly discolored the nylon around the steel from heat transfer allready.I really feel that I have enuff heat but cant get solder to flow into joint.any more sugestions? thank-you all.
Have you tried to use the old plumbers trick of wrapping what you don't want to get too hot with a wet rag?
Another trick is a variation of electronic soldering that prevents overheating a heat-sensitive device when connecting it to a circuit board:: clamp an aluminum heat sink to the steel rod as close to the work area as possible. The heat sink can be just a piece of aluminum flashing that's trimmed in such a way that you can easily wrap a portion around the rod with a larger surface like a "flag" to dissipate the heat. Think of something like a 3" x 5" piece of flashing with a 1/4" wide 1" long "tab" coming off one corner. Just wrap the tab around the steel rod, position the "flap" so that it's out of the way and do your soldering. If you have a small "C" clamp, use it to clamp the wrapped tab to the steel rod for better heat conduction (tighter connection to the steel).
Hope this gives you some ideas!