The normal mode of soldering will not work definitely;brazing is a solution though. But as the material is coaxially fitted, so brazing will effect the inner material?
I tried soldering the material by using solder work station at 400 degree C, but that didn't work out too....
Any best possible solution from anyone???
Clean the copper surface thoroughly, (remove all oxide layers) by scraping
Use a good quality flux.
1) You can use use a low temperature solder pastes. (and avoid going to higher temperatures), and thereby reduce your soldering temperatures, and prevent the degradation/burning of any inner materials.
You can get low temperature solders working in range 150 to 180 deg.
See some low temperature solders on ebay.com
K. Sreenivas
Thank you much Sreenivas Sir for the valuable input..will try out....
Proper soldering techniques requires the item to be soldered ( fine wire in this case) to be heated to the point where the solder will melt on contact with the copper wire. in this case of such a fine wire, the heat content of the copper wire is very low becasue of the mass of the copper relative to the solder perhaps. Indeed, a lower temeprature solder as suggested by K. Sreenivas will help.. Using a smaller diameter solder reduces the mass of the solder and the heat required to melt it. So a solder paste or very fine solder wire should be helpful
A good solder joint cannot be made by melting the solder without having the copper at a hogh temperature where the solder cannot flow..The copper wire must be above the melting point of the solder. The same is true for brazing. Brazing just requires higher temperatures
My answer to your question will be counter intuitive. My experience is that of musical metallic strings. The experiments we conducted show a reduction of the damping coefficient when metallic strings are stretched on a bench with ad hoc sensors. For a string were never tense, is measured at the time T0 the damping coefficient of each of its eigenmodes ; then we repeat these measures over time, T1, T2, T3... We then noticed a decrease in the damping for all eignemodes, then, after awhile, damping stop decrease, and it is at this time that musicians feel that the string has reached its optimum qualities. The metal strings of iron, steel, brass, copper ... all have the same behaviour. Strings are drawn stock passing through dies, which means that the grains, closely bonded together, present a continuity for wave deformation propagation ; the damping depends on the propagation of waves in the metal crystal. When the string is stretched, it occurs then micro ruptures between grains which induce dislocations in the macro structure of the metal. These dislocations have the effect to block the grains between them and thus allow a reduction of the damping [1]. All this, the theory and the calculaion are in the book by Claude Valette and Christian Cuesta, « Mécanique de la corde vibrante » , édition Hermès, Paris, 1993.
All this to say that I think the cast iron must have less damping than ductile iron. Indeed, the iron is characterized by grains trapped by dislocations (that is why the iron is brittle, breakable and non-ductile), while the soft ductile iron has a greater damping. Moreover the musicians of harpsichord and piano forte of the beginning of the 19th century set up of iron strings know that the strings spend several months before “speaking”…
[1] C. Cuesta, C. Valette « Evolution temporelle de la vibration des cordes de clavecin » Acta Acustica united with Acustica, Volume 66, Number 1, June 1988, pp. 37-45(9). Publisher: S. Hirzel Verlag
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