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Old 01-29-2013, 06:01 PM
shopsmith shopsmith is offline
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Default silver solders

I'm trying to unconfuse myself. I understand the basic difference in silver content like 3.8%, 9%, 15%, 45%, 56%. But what are the typical melting points? And maybe the purpose of each. For example which would be better for a brass to brass, or an aluminum to aluminum? I keep researching and I get wide swings in temps for the same content silver rods or wire. Maybe thats the other metals included. I keep seeing silver solder used but maybe a suggestion on which to use typically for basic steel to steel, brass to brass or copper and alum to alum would help. Just a bit uninformed about which works where and the temps. I saw the charts at Airgas and it helped clear the fog a little but the alum with the alum flux is a stumper.
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Old 01-29-2013, 06:31 PM
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I haven't research enough to give you a textbook answer.

But I will say that the higher the silver content, the easier it flows. I do a lot of copper-to-copper and copper-to-brass.

When I am in a good position, I use the cheap(er) 5% silver. When I'm in a hard position and especially when doing something critical with a high pucker factor, I use the 15% silver.
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Old 01-29-2013, 08:02 PM
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I checked around and it seems the higher the silver the higher the melting point. That was until someone posted that 65% was considered to be a lesser melting point than 56 and then my head hurt. I have some 3.8%. I wanted to get a bit sturdier with a 800 or so degree melting point for some alum that I wanted to solder together. Based on some charts it would seem that should be either 9 or 15% silver..but then I got some conflicting info. if anyone can clear the fog...
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Old 01-29-2013, 08:07 PM
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greywynd greywynd is offline
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In my case I just use whatever happened to follow me home from former employers..... actually it just seemed that there was always some in a drawer in my tool box that just happened to miss getting left there.
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Old 01-29-2013, 08:09 PM
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Here's a list of some various alloys & etc. Have fun.

http://www.silvaloy.com/brazing_table.php
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Old 01-29-2013, 08:18 PM
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The silver content is one of the keys to the melting point but so is the alloy it is mixed with. So one silver % compared to another brand with the same silver % with a different alloy will not all melt at the same temp.
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Old 01-29-2013, 08:55 PM
shopsmith shopsmith is offline
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Thats whats killing me. the whole different manufacturer thing. Hate to spend money without some sense of what the hell I'm doing.
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Old 01-29-2013, 08:56 PM
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That chart helps alot.
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Old 01-29-2013, 09:02 PM
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Quote:
In my case I just use whatever happened to follow me home from former employers..... actually it just seemed that there was always some in a drawer in my tool box that just happened to miss getting left there.
That's what I call a "going away present"

I went from working at the Sheriff's Dept to working at LAX on corporate jets. When I brought my tools in, nobody checked what I had. When I was leaving suddenly there was a big interest in what I had. Luckily I knew this in advance because after doing a drawer to drawer search I found 3 boxes of 9mm range ammo that one of the Deputies had given me. I don't think that would have gone well with the powers that be so I had to smuggle the boxes out in my lunch box before the big search. Those airport cops just have no sense of humor.
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Old 01-30-2013, 02:58 PM
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Rio Grande Jewelers supply has a great selection and alot of info. It is correct that the higher the silver content, the higher the melting point. I use both 56% and 65%. I don't think you'll be soldering aluminum together with this method though.

One other thing; your going to pay out the Ass at the local welding supply. Give Rio Grande a try. You can buy it by the ounce or the foot. They also sell handy flux which is good through the higher temp ranges. http://www.riogrande.com

http://www.riogrande.com/Category/To...28/Silver/4446

Last edited by Matt_Wheaton; 01-30-2013 at 03:07 PM.
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