Any non Hi-Fi brand solder better than Mcap and Siltech silver solder? - Page 2 - diyAudio
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Old 5th August 2010, 11:21 PM   #11
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IF you use wire or other components that have a silver content you must use a silver bearing solder, otherwise over time the silver content is leached and the joint has problems... a eutectic solder melts and solidifies at practically the same temperature... making the solder joints much easier to make.

Soon we will have to weld in an inert gas environment... to heck with this solder stuff...

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Old 5th August 2010, 11:32 PM   #12
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The point here, is it needs to be a eutectic alloy. Apparently there are patents on some of the silver solder compositions, so just because it is a silver containing solder does not mean it may necessarily be a eutectic alloy.
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Old 6th August 2010, 12:23 AM   #13
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The main reason silver bearing solder exists is that when working with very fine copper wire, enough copper will dissolve in plain molten solder to weaken the wire. It was also specified for the old Tektronix scopes that used ceramic connection strips with U-shaped fired silver areas. Without silver bearing solder, the fired silver would delaminate from the ceramic or dissolve entirely. It makes sense that you'd want it for any other soldering involving silver. It was also recommended to increase the service life of soldering iron tips, the cheap copper ones not-so-slowly dissolving away in use. I like silver bearing solder because it seems to resist oxidation a bit better than plain 63/37. It's gotten rather expensive and there's nothing wrong with the plain 63/37 or 60/40 if that's all you can get. It's a bit inexplicable, as the price of silver isn't that high and the percentage used is low. Like certain other things containing silver, some opportunistic pricing is probably taking place. I'm not aware of any patents on the traditional solder alloys that are still in force, though there are probably some on the lead-free alloys and certainly on many modern fluxes. Mildly activated rosin is still the best, whether you clean it or not. "No clean" is just less rosin and I don't see the point. I also like the organic water washable flux, which makes a great looking board, but you have to be sure to get every trace of it off when you wash the board. Don't use it on switches or things that can't be immersed. The rational behind lead-free escapes me and the risk of tin whiskers and eventual circuit failure shouldn't be discounted. I have a lot of 50 year old test equipment that works perfectly, and when I build for me, I build for the same time-frame, even if I won't be around to listen to it by then.
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Old 6th August 2010, 12:37 AM   #14
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A eutectuc material will either be liquid or solid. All metallurgical phases solidify at the same temperature. (or melt). It has no "slushy zone". 60/40 0r 63/27 are for the most part the same.

Silver migration even with silver bearing solders will happen when heated. I don't have a good tertiary diagram available to me on Pb/Sn/Ag but what I do have shows that above about 2.5%Ag you start to form a third phase upsetting the single liquidus. It does have better oxidation properties
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Last edited by SGregory; 6th August 2010 at 12:40 AM.
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Old 6th August 2010, 02:53 PM   #15
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afaik 60/40 is not eutectic...

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Old 6th August 2010, 03:51 PM   #16
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Does any one have any experience with Johnson IA-423 tin/silver/copper eutectic?

JOHNSON MFG. CO., Johnson's Pure, Lead-Free and Leaded Solder Compositions.
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Old 6th August 2010, 04:59 PM   #17
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Quote:
Originally Posted by bear View Post
afaik 60/40 is not eutectic...

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Solder - Wikipedia, the free encyclopedia

Good information on solder. Also I checked all of our solder at work and its all 63/37. I was wrong.
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Old 6th August 2010, 07:35 PM   #18
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I use Stannol Type 2630. It has S-SN60PB39CU1. I solder between 270 to 300 Celsius on a Weller PU81 with a 3mm or 0.8mm tipp. I desolder at 350. The result is shiny and when i cut a joint the amalgam looks like a solid piece of metal. I can not say that it sounds any better or worse than other types but compared to Mundorf, WBT or Eichmann that i use sometimes when a customer wants it i can not hear any problem. It does not sound shrill and i can not hear any loss of information.
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Old 6th August 2010, 09:10 PM   #19
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do they still let Pb containing solder be sold in Europe??

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Old 6th August 2010, 09:47 PM   #20
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Yes, for privat use and i think in Aerospace and Aviation because they had a lot of trouble with cracks.
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