What type of wire is suitable for soldering in wet environments?

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Discussion Overview

The discussion revolves around the suitability of different types of wire for soldering connections to stainless steel and copper plates in wet environments, particularly when the stainless steel is immersed in water. Participants explore various methods and materials for achieving reliable connections in these conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Some participants question the feasibility of soldering to stainless steel, suggesting that welding may be a more appropriate method.
  • Others argue that soldering is possible with the use of special flux designed for stainless steel, although they note that the bond strength may be weak without it.
  • One participant mentions that normal copper wire could be suitable for connections involving a copper plate.
  • Concerns are raised about the effectiveness of soldered connections in wet conditions, with some suggesting that high resistance may affect the strength of the joint.
  • Participants discuss alternative methods, such as using crimp connections or spade lugs, to create more robust mechanical connections to the stainless steel plate.
  • There are inquiries about the challenges of soldering to copper, with one participant noting that heat management is critical due to copper's high thermal conductivity.
  • One participant warns against making connections between dissimilar metals underwater due to potential corrosion issues.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and effectiveness of soldering to stainless steel, with some advocating for welding instead. There is no consensus on the best approach for making connections in wet environments, and multiple competing methods are discussed.

Contextual Notes

Participants highlight limitations related to the specific conditions of the environment, such as the presence of water and the dimensions of the stainless steel plate, which may affect the choice of connection method. There are also unresolved questions regarding the strength and reliability of soldered joints in these conditions.

mathew086
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I would like to solder a connecting wire to a stainless steel plate and a copper plate. Both of the plates are in and around wet environments, possibly in water. What type and size of wire could be used to solder them. Specifications?
Can i use a normal connecting wire?
 
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mathew086 said:
I would like to solder a connecting wire to a stainless steel plate and a copper plate. Both of the plates are in and around wet environments, possibly in water. What type and size of wire could be used to solder them. Specifications?
Can i use a normal connecting wire?

Don't think you can solder to stainless steel. You should probably be reading about how to weld to stainless steel instead.
 
You could use a wire "crimp-on" and make a screw connection to the stainless steel.
 
But i tried to solder the stainless steel normally and it worked. ( although some brown reddish material was formed in between.)
Also it is strong...I just need to know the type of wire that will withstand in wet conditions...
I thought of using a wire crimp on and scre it to stainless steel. But the stainless steel plate is small in dimension only 1cm width. Also the screw has to go through another thick layer of plastic which cannot be drilled. ( water can leak through the scre holes).

So any other suggestions??
 
berkeman said:
Don't think you can solder to stainless steel. You should probably be reading about how to weld to stainless steel instead.

Sure you can, but you need to use special flux made for soldering stainless steel (I quite often have to solder SMA connectors to stainless steel coax). You don't need any special equipment or special solder, but you DO need to flux in order to make a good joint (it IS possible to get it to stick without flux but the joint are weak).

When you say "wet", what does that mean? Immersed in seawater or something that might occasionally get sprayed by fresh water.

Although If you are already using a copper plate I can't see any reason normal copper wire wouldn't be ok.
 
Wet means wthe stainless steel plate is immersed in water( rain water). I need to connect that plate to + terminal of battery via a wire. so will a normal wire wounded with insulation tape all around will work??
 
I didn't think that the connection would be that good (maybe high resistance). But I guess it only effects strength?
Soldering Stainless steel can be soldered
using the conventional lead—tin solders but
the bond strength is often poor as is the colour
match. Better results are often obtained by
using the silver-bearing soft solders. The
silver—tin alloys with approximately 5%
silver are particularly useful especially with
the stainless steel holloware.
"www.jm-metaljoining.com/pdfs.../Joining%20Stainless%20Steel.pdf"[/URL]
 
Last edited by a moderator:
mathew086 said:
Wet means wthe stainless steel plate is immersed in water( rain water). I need to connect that plate to + terminal of battery via a wire. so will a normal wire wounded with insulation tape all around will work??

Can you just drill a hole in the plate, and make the wire connection via a spade lug and star washer? Seems like that would be mechanically more robust.
 
Could you make a cut in the stainless steel like this:

Join stainless steel.PNG


Then bend the small strip of stainless steel so that it was out of the water and then make an electrical contact with it well clear of the water.
 
  • #10
AT the moment i used the method suggested by berkeman. USed a spade lug and connected to the stainless steel plate.

The method suggested by Vk6kro is not possible, because the connecting wire has to be taken to upward. If it was supposed to take at the downside, then it would have been possible.

Again one more question, how is it possibel to solder a wire to coppper sheet. I treid to solder on copper, but after a few minutes, it gets removed very easily. not strong.
any ideas?
 
  • #11
mathew086 said:
AT the moment i used the method suggested by berkeman. USed a spade lug and connected to the stainless steel plate.

The method suggested by Vk6kro is not possible, because the connecting wire has to be taken to upward. If it was supposed to take at the downside, then it would have been possible.

Again one more question, how is it possibel to solder a wire to coppper sheet. I treid to solder on copper, but after a few minutes, it gets removed very easily. not strong.
any ideas?

It is very hard to heat copper as it conducts heat very well. So, you may need to use a gas flame to heat it. The copper has to be hot enough to melt the solder before it will make a good soldered joint. If you have gas in the kitchen, this might be suitable.

I would not choose to make a connection of two different metals under water if I could avoid it. Corrosion is almost certain if you do that.

Join stainless steel 2.PNG
 

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