How to modify a bad Chinese solder

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Hello! Today I found a solution to the most popular problem, this is Chinese refractory solder. The difference in it is that it has a small amount of lead, or no lead at all. Of course there is the simplest solution to either solder with a powerful soldering iron or throw it out altogether. Well, you can spend a little time and slightly improve the solder. Let's start.

We have this kind of solder that I searched for a very long time on the Internet, found but only on one site and even without any information, so we will experiment with adding lead to an unknown composition. I have about 80 grams of solder so we need to add 20 grams of lead here, of course this information is not accurate, but according to my experiments it turns out that way.

I took about 50 grams of unknown solder and some lead. Here only experiment in any other way. Add a little lead, and then test, if it is bad, then add more.

In general, this is how I did it. You also need to determine the shape with which you can then pull out the solder and also splash a little and maybe even cut it for more convenient soldering. So this is what happened, thank you for your attention, you can also watch the video, maybe this information was useful since I haven’t seen it anywhere, thanks to everyone!

Guest Sergey Yesterday, 13:02 +1

Reply To quote A complaint

The easiest way is not to buy Chinese, although there are difficulties with this, there’s no other, but we don’t do ours, probably forgotten how. As a child, in general, they always made the solder themselves, showed them in the Skilful Hands mug, melted the lead and tin in approximately equal shares and got a completely normal solder. When I went to work, the prima was already ready, with rosin, from the factory, they generally soldered the song to them.A pot and tin homemade it was possible.

January 23, 2020 23:34 +1

Solder

January 21, 2020 13:56 0

Khatul Madan,
Yes, there is such a thing. If I do not confuse, an example is the Rose alloy. Melts in boiling water. I sometimes tinkered with them printed circuit boards for mass production at home.

R555,
This is an example of circuit boards where paths are tinned with a Rose alloy in boiling water (I have left it from mass production at home)

I bred a board of a device of our own design in the Sprint Layout program, the drawing was applied to fiberglass using the laser-iron technology. Etched in a solution of ferric chloride.

January 21, 2020 13:32 +3

R555,

The more tin, the more fusible the solder. But, with the exception of POS-90, its melting point is higher than that of POS-61.

In metallurgy there is such a thing as eutectic, at which the ratio of the components of the alloy will have the lowest melting point. The melting temperature of the alloy is always lower than the melting temperatures of individual components.

January 21, 2020 13:08 +1

I explain to those who are not in the know.

In this photo, I marked the red line POS-61 solder made in Russia. To the left is a coil of Chinese solder of poor quality (high-melting, soldering does not shine). The author shows something like this. But the Chinese also have solders of different qualities. With almost the same marking on the reel, I bought their solder of excellent quality.

And now about the decryption. PIC stands for Solder Tin Lead. And the number indicates the content tin in alloy. Than more tin, the more fusible is the solder. But, with the exception of POS-90, its melting point is higher than that of POS-61. And the POSK, which I mentioned in the previous comment, stands for Solder Tin-Lead Cadmium. It has a melting point even lower than that of POS-61 and is designed to solder parts that are particularly sensitive to overheating, for example, piezoelectric emitters.

January 21, 2020 13:03 +3

the simplest solution is either to solder with a powerful soldering iron or to throw it out altogether.

The second is preferable to remelting an unknown substance, and even add lead to it (by the way, what is it taken from?).

January 21, 2020 12:19 +2

The author, but you don’t confuse anything (that there is little lead in solder?) Doesn’t it seem that there is not enough tin in it?

Do you know how the brands of Soviet solders POS-40, POS-61, POSK are deciphered?

January 21, 2020 11:56 +1

Thank God you can still find POS-61!

How to modify a bad Chinese solder

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