Soldering can be one of the most baffling moments in a jewelry studio. You carefully prepare your pieces, lay on your solder, light the torch, and then… nothing happens. The solder sits in a little bead, unaffected by your repeated heating. If you’re new to the studio, you might not be sure what you did wrong. Actually, the fix is probably something simple. Here are five common reasons your solder may not be flowing: Bad joint: The seam wasn’t tight enough. Dirty metal: There was dirt or oils on the pieces. Insufficient flux: You used too little flux or it burned away. Bad heat: You applied heat unevenly.
Let’s look at these five common mistakes more closely. When you first start working with jewelry, solder seems like a magic material that will fill gaps in your pieces. But the truth is that solder requires a fairly tight join to flow properly. When you solder, you need to make sure the two edges are very close. If they are too far apart, the solder may not flow between them. Here’s an exercise to check this. Cut two short pieces of copper sheet. File them flat, then lay them together on your soldering surface. Hold them up to the light. If you can see a gap in the join, the pieces aren’t close enough for the solder to flow.
Take them back to the file and make the join tighter. Cleanliness is crucial when working with solder. Oils from your hands, oxidation, and dirt can all prevent the solder from flowing. You can test this out. Cut two pieces of copper. Clean them, then handle them extensively. Try to solder them. What happens? Here are a couple of common mistakes that can cause cleanliness issues: Touching the metal after cleaning: You clean your pieces, but then touch them again. When you handle them, oils from your hands get on the metal, causing the solder not to flow. Insufficient flux: Flux helps keep the metal clean while you’re heating it. But if you don’t use enough flux or if you burn it off before you get to temperature, the metal can oxidize.
This will also prevent the solder from flowing. To avoid these problems, handle your pieces as little as possible after cleaning. Use enough flux and avoid burning it off. Cleanliness issues often show up as dark areas on the metal. Here’s how you can test this. Cut a piece of copper and clean it. Then apply flux and try to solder it. Now touch the copper with your fingers. Try to solder it again. What happens? If you point the flame directly at the solder, it may melt into a ball and never flow. This is because the rest of the piece never reached the proper temperature. Here’s how you can avoid this.
Cut a piece of copper and lay a piece of solder on it. Then, holding the flame a few inches from the copper, slowly move it around the piece. Bring the temperature up slowly and evenly. When the piece is hot enough, move the flame so that it just kisses the solder. The solder should run along the copper. The trick to soldering is to bring the temperature up slowly and evenly. This ensures that the entire piece is the right temperature for the solder to flow. Practice this until you get a feel for it. When you’re working with small pieces of copper, it’s easy to get impatient. You may be tempted to just throw some solder on a piece and heat it until it runs. But this rarely works, and is a great way to burn yourself.
Here’s a better way. Cut three sets of small copper strips. Prepare the first set and then solder them together, focusing on getting a tight joint. Prepare the second set and solder them together, focusing on using the right amount of solder. Prepare the third set and solder them together, focusing on the heat. When you have problems, jot down what might have gone wrong on the copper strip. You might write gap too wide or heated from one side or flux burned away. Doing this helps you see patterns in what you’re doing, and patterns are the key to improving. Bad solder joints are frustrating. But they don’t have to be. The next time you’re having trouble getting the solder to flow, step back and assess the situation. Is the joint tight? Is the metal clean? Is the flux still good? Is the heat even? Fixing these problems is the key to success.