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Solder ???

Step folding question

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Ian Richards 408/09/2020 11:20:51
11 forum posts

Good morning.

A very basic newbie question regarding Step Soldering.

I have some Johnson Matthey Silver-flo 55 but require TWO lower temperature melting point solders and suitable flux to complete my wick lubrication tank.

Any advice greatly appreciated.

Many thanks


CuP Alloys 108/09/2020 16:06:40
258 forum posts

Hi Ian,

What does Johnson matthey suggest 🤔?


Ian Richards 408/09/2020 16:11:51
11 forum posts

I did have a look at their website.
Alas, being a newbie to model engineering, I'm not at all sure what to look for, hence my question to the experts



Clive Brown 108/09/2020 16:51:12
506 forum posts
18 photos

Don't get too hung up on different MP solders for assemblies. Can you pin thefirst joints with small screws or rivets? Also, you can often get away with using one grade of solder if the first joints are kept slightly away from the flame for the later joints, since remelting seems torequire a slightly higher temperature than the initial melt.

Ian Richards 408/09/2020 16:53:54
11 forum posts

That's really encouraging

I won't be able to pin the joint, but I can try and keep the flame away from it.
If I fail, I can easily redo the job and learn loads in the process !!!



JasonB08/09/2020 17:10:27
18915 forum posts
2082 photos
1 articles

As Clive says if you can get away with just one then that would be the easiest option as 55% solder is really the lowest melting of whats available to us now so the easiest to get to flow.

If you do want a higher temp one for the first heats then a 30% silver content one would give you a melting point that should not overlap, just take care not to distort any parts due to excess clamping pressure as the metal is starting to get a bit soft at the elevated temps. You will also want a flux that cane take the higher temps and longer time needed to get the work upto them such as HT5

Bazyle08/09/2020 17:48:55
5488 forum posts
207 photos
Posted by Ian Richards 4 on 08/09/2020 11:20:51:

my wick lubrication tank.

So not a pressure vessel? Not getting hot?

You can use several versions of soft solder, even the ultra low temp versions used for whitemetal.

Ian Richards 408/09/2020 18:16:42
11 forum posts

That's what I wanted to hear.



Perko709/09/2020 11:19:57
353 forum posts
25 photos

Another option is to clamp a decent heat sink onto the area already soldered before soldering the next area.

+1 on the comment from Clive Brown 1 about re-melting needing more heat than the original melt.

Ian Richards 409/09/2020 11:40:25
11 forum posts




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