soldering to nichrome wire
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Posted by Joe on November 9, 2006, 8:26 pm
Please log in for more thread options I am trying to solder copper wire (tinned) to nichrome ribbon (more like wire, but wider), which I took from an old toaster. The nichrome ribbon doesn't seem to like the solder. Is there a trick to this? Or should I be doing something to the nichrome before I try to solder it? On the toaster I dismantled, I noticed it was soldered to some thick copper conductors, so I didn't think it would be a problem. I even crimped the ends of both, hooked them together, and soldered them. After a time I picked up the connection and it fell apart. Any advice or help is appreciated. TIA, Joe | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by John Popelish on November 9, 2006, 8:09 pm
Please log in for more thread options Joe wrote: Nichrome used for heating is usually welded, not soldered, because the operating temperature is usually above solder melting point. However, if the solder joint is well heat sunk by the copper side of the joint, you might be able to use a high melting temperature solder. Once the nichrome has been red hot for some time, it forms a very tough oxide coating that makes either welding or soldering very difficult unless the oxide is removed. I would try cleaning one surface with very fine silicon carbide sand paper (600 grit or finer) and silver solder with silver solder flux. This will require the heat of a butane or propane torch. If you don't require the temperature capability of silver solder, you can tin the nichrome with it, and then use low temperature tin lead solder to attach that surface to copper. | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Jamie on November 9, 2006, 8:34 pm
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Joe wrote: > I am trying to solder copper wire (tinned) to nichrome ribbon (more like
Silver solder it.
> wire, but wider), which I took from an old toaster. The nichrome ribbon > doesn't seem to like the solder. Is there a trick to this? Or should I be > doing something to the nichrome before I try to solder it? On the toaster I > dismantled, I noticed it was soldered to some thick copper conductors, so I > didn't think it would be a problem. I even crimped the ends of both, hooked > them together, and soldered them. After a time I picked up the connection > and it fell apart. Any advice or help is appreciated. > > TIA, > Joe > > you'll need a mini torch or a very hot iron! -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Homer J Simpson on November 9, 2006, 9:23 pm
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> I am trying to solder copper wire (tinned) to nichrome ribbon (more like
> wire, but wider), which I took from an old toaster. You can't. Crimped or bolted connections are the way to go. | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Joe on November 9, 2006, 11:20 pm
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John, Jamie, Homer, Thank you all for the ideas. I should have realized that nichrome gets hot when current runs thru it and would probly melt the solder anyway. Well, I have several ideas now, so I can proceed. Thank you all very much for the suggestions. Joe >
> >> I am trying to solder copper wire (tinned) to nichrome ribbon (more like
>> wire, but wider), which I took from an old toaster. >
> You can't. Crimped or bolted connections are the way to go. > > > | |||||||||||||||||||||||||||||||||||||||||||||||||
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> wire, but wider), which I took from an old toaster. The nichrome ribbon
> doesn't seem to like the solder. Is there a trick to this? Or should I be
> doing something to the nichrome before I try to solder it? On the toaster I
> dismantled, I noticed it was soldered to some thick copper conductors, so I
> didn't think it would be a problem. I even crimped the ends of both, hooked
> them together, and soldered them. After a time I picked up the connection
> and it fell apart. Any advice or help is appreciated.