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Old 01-06-2012, 10:31 PM   #1
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Silver Solder?

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I thought I would post my question here as this definitely is the forum where the builders hang out! I am building the BUSA 1/3rd scale Super Cub and part of the build is to put together the landing gear. It is done with silver solder. The more silver content the stronger the joint and after doing some research I have found some good quality (45% silver) supplies at a local welding supply store. It only comes however in a fairly big roll (way more than I will need for many, many builds!) Two questions: 1. do you guys know where I could get small quantities of the high silver content solder? 2. If it is not possible to get it in small quantities would any of you be interested in buying some from me so that I can ------ out the pain a bit? The package I was looking at was probably about a pound and will cost about $350 dollars! I would not be interested in making any profit on the deal but rather just splitting up the material and dividing the cost. If there is enough interest in doing a group purchase I would get some more details and some estimates of cost etc. I would buy the solder and flux and then take care of dividing the package into as many portions as we need. Let me know.... Thanks
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Old 01-06-2012, 10:36 PM   #2
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Re: Silver Solder?

Boat guys use it too. I have a smaller roll somewhere. I will see if I can find it and check the specs.
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Old 01-06-2012, 10:45 PM   #3
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Re: Silver Solder?

You can always try a local sheet metal place.
A business where they do commercial roofing and metal work.

They might be able to cut you off a foot or 2, whatever you need.
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Old 01-06-2012, 11:22 PM   #4
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Re: Silver Solder?

We use silver solder at work, but cannot tell you what the percentage is. I found the higher the quality and strength the higher heat is required. Be careful you do not alter the properties of the gear when soldering them together.

We also use the proper soldering paste. Otherwise when heated enough, (red hot for ours) the metal forms a boundary layer and the solder will not bond.
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Old 01-06-2012, 11:30 PM   #5
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Re: Silver Solder?

go to a welding supply store and ask them for silver soder in a stick about 24 in. long and it has a pink coating{flux}.
I'm sorry I do not have the brand name
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Old 01-06-2012, 11:34 PM   #6
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Re: Silver Solder?

CTC home depot etc. should all have it in the plumbing section.

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Old 01-07-2012, 12:21 AM   #7
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Re: Silver Solder?

I used that same metal work solder for my Beaver landing gear, and using a soldering iron it didn't hold. If you do use it - get a torch and good paste.
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Old 01-07-2012, 07:48 AM   #8
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Re: Silver Solder?

I get mine at Praxair locally - actually any decent welding supply should have smaller quantities.

The best I've found for this kind of thing is 'Easy-Flo 45' - it's a 45% silver alloy, and mine is made by Lucas-Millhaupt. (Handy & Harman Company).

There are others in this range, different temps etc., for complex items.

I don't think I paid any more than around $20 for the roll in a plastic plastic pack - and there's more than enough there to do a bunch of landing gears!

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Old 01-07-2012, 09:08 AM   #9
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Re: Silver Solder?

The " silver solder " sold by CTC is no good as it has only about 3% silver. You can buy both sticks and small rolls ( 31 grams ) at most welding supply shops. The 45 to 55 % silver content is best. You can also buy it on ebay. I priced it about 3 months ago, locally, and they wanted $64 for 1 troy ounce ( 31 grams ) thats about 5 feet of 1/16th inch diameter wire. Ontarios ECO Fees really screw us .. you can probably get it for less in Alberta. I finally went across to the USA to buy mine. 1.9 ounces ( 10 feet of 1/16 inch dia. wire ) cost $55 ..
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Old 01-07-2012, 09:22 AM   #10
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Re: Silver Solder?

I have used this kit several times and it works great. I buy it at the hardware store across the border but it can be found online in places like amazon.

56% silver and very strong. Make sure you have a torch that is hot enough. Propane works for small items and I have had good luck with map gas torchs as well.

I have bought flux and have seen solder at the local sheet metal and hvac supply store.

If you get the solder by itself make sure you get propper flux for the correct temp range. Also make sure the metal is very clean. The solder flows very thin so dont leave any gap in the mating parts.

Its easy stuff to use and makes a very clean fillet at the joint if the metal is clean enough and there is enough flux. Heat it till the flux starts to melt and flow, the metal will be a light dim cherry red colour at this point. Remove the heat and apply the the solder, if it does not flow add a bit more heat and try again. It is possible to overheat the metal and cause an oxide layer that stops the solder from flowing. Stainless is very bad for this.

Sometimes depending on the parts you can make small rings of solder and slide them onto the joint into the flux then apply heat. The flux and solder will flow when they are ready and it can make the job a little easier. If you use this method do not apply heat directly to the solder as it can cause the solder to melt early. Put the heat on the edges of the joint and flux untill it starts to flow then you can heat the joint directly.


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