Jewelry soldering pastes are made from a fine powder of a soldering alloy in the desired karat/purity. The fine powder is mixed with soldering flux and a paste-like binder. When the soldering paste is heated, the liquid flux is released first and covers the joints surfaces to prevent its oxidization. Then, the soldering alloy powder melts and runs into the joint area.
Some of the materials used to make the soldering paste are sensitive to sun light/strong light/high temperatures. When stored in improper conditions, the paste might lose its properties. It is important to store the paste in a cool, dark place, preferably in the refrigerator. Under such storing conditions, the paste will keep its full properties for at least 2 years.
The exact formula used for producing a jewelry soldering paste varies from manufacturer to manufacturer. Naturally, some pastes are of higher quality than others. Verify that you purchase your soldering paste from a reliable source that uses the highest quality materials and standards.
There are a few levels of the rigidness of soldering: soft, medium and hard.
Different cases for using the soldering paste:
Soldering delicate chains or posts
It is possible to use a sheet or wire and a soldering paste together
when the solder wire or sheet moves and melts away from the point wanted.
When both sizes are joined and there's no need to fill (like ring that you want to reduce its size).
Welding large flat parallelsurfaces.
soldering stages when using soldering paste:
- Always use solder of the same karat as that of the jewelry piece, so that it complies with the universal jewelry standards.
- The pastes should be used with syringe that a metal needle is attached or a plastic one with the needed diameter.
- Dip the piece piece in an ACID BORIC solution before applying soldering paste.
- After the soldering process, the piece should be immersed when still hot, in a liquid solution containing 10% SULFHURIC ACID and 90% water. The acidic solution will melt the borax.
• Clean the jewelry properly from fat.
• In order to solder the same point several times, you should use different types of solder: It is recommended to first solder with hard solder at a high temperature and then progress to medium and soft solder at progressively lower temperatures.
• When you need to solder an exact point and you don’t want the solder to spread, you can use a soldering paste named: “STICKY”.
• Heat the joint, not the solder. If you just heat the solder it will
ball up and have no effect. When the joint is hot enough the solder will
melt and run into the joint.
• Don't apply the heat too long. If the solder doesn't melt within
30-40 seconds or so there is a good chance that the flux will lose its
properties and the solder won't run even when the joint gets hot enough.
The most common cause is that the joint doesn't get hot enough to melt
the solder. If this happens, remove the heat, clean the joint and start
again with a bigger flame and/or better heat concentration.
Advantages of the soldering paste:
1. Saves time.
2. Reduces wastage, since you have an exact control on the amount of the soldering paste that you use.
3. Unskilled person can easily be trained to use the dispensers.
4. It enables to increase the production.
5. The soldering paste contains Borax.
Head, Customer Service
Pasternak Findings- Jewelry Findings and Jewelry Making Supplies