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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#81
Posted to alt.engineering.electrical,sci.electronics.basics,sci.electronics.repair,sci.electronics.design
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Unsolderable wire?
In article ,
John G writes: Ralph Mowery expressed precisely : "Steve" wrote in message ... Bob E. writes: I am trying to solder some RG-6 shield to a pcb. The braid won't tin. It's almost like it's dissipating the heat faster than I can apply it. With both a temp-controlled iron (set as high as 700F) and a mondo 100W stick I finally tried. The solder will barely melt when touched to the braid opposite the iron. That just sounds like another excuse to the use the butane torch Most of the rg-6 uses aluminum instead of copper or tinned copper. The normal methods of soldering will not work on it. I'll believe Aluminium or steel I must admit to only a little actual experience. Some Cable guy should give an actual answer. Ordinary soldering can be used with iron - soldering iron bits are often copper core for thermal capacity and conduction, with iron plating which wets well with solder but doesn't oxidise/corrode as quickly as a bare copper bit does. As you go to steel and then stainless steal, it gets harder to do. Stainless steal in particular is protected from corrosion by a very tough layer of chromium oxide (I don't know if it's possible to solder stainless steel at all). Aluminium has a similar problem - a very tough layer of aluminum oxide which needs a suitable flux to strip through. However, it also needs a different solder alloy to wet it - it's a long time since I did it but ISTR using a solder alloy containing silver. A secondary problem with soldering dissimilar metals is that any moisture risks causing galvantic action/corrosion of the join, and in the case of aluminium, this happens even between the aluminium and the solder used. Selecting a flux which can strip the aluminimum oxide well whilst not leaving any residue which eventually corrodes the join is a bit of a challenge. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#82
Posted to sci.electronics.basics,sci.electronics.repair,sci.electronics.design
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Unsolderable wire?
On Sat, 27 Feb 2016 11:20:43 +0000, Andrew Gabriel wrote:
As you go to steel and then stainless steal Engineering schlip? |
#83
Posted to alt.engineering.electrical,sci.electronics.basics,sci.electronics.repair,sci.electronics.design
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Unsolderable wire?
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