What is soldering

Brazing, soft solderingSoldering allows us to join metal parts together. A so-called bonding agent is used for this, which can also be called solder or simply solder. Soldering is a relatively simple process. All that is required is a soldering iron and knowledge of its use and of metalworking. The material used to join components has the same physical and chemical properties as the elements in the metal group. This ensures a homogeneous appearance of the weld after the process is completed. However, the joints are visible to the naked eye. They resemble thickenings at the point where the parts are joined.

Popular metalworking techniques can also include welding. Unlike welding, brazing is a process which allows components to be joined without damaging their structure. Brazing is carried out at a temperature that will not overmelt or damage the components being joined together. The temperature produced by the soldering iron must be high enough to make the joint ductile. It is slightly higher than that needed to melt the solder, yet low enough not to damage the components being joined.

Soldering course

The soldering course will be an excellent choice to learn about proper soldering with practical knowledge and by doing exercises under the guidance of an experienced instructor. During the course you will learn, for example, how to choose the best soldering iron.

The aim of the course is to make the participants realise that they don't have to do everything right, especially when soldering by hand. How to troubleshoot and determine what went wrong and how to correct the mistakes that occurred. During the training courses, you will learn how to solder correctly and receive professional tips that will enable you to solder at a high level.

The soldering course is designed to give participants the skills to produce solders that will meet the performance standards of their specific industry.

The soldering course is divided into:
  • Przygotowanie
  • Cynowanie
  • Soldering

These are the steps that will help you to solder professionally and perfectly. Mastering the above steps will enable you to become a professional. During the course, you will also receive tips to avoid mistakes and be able to determine your soldering time.

What types of soldering we can distinguish

We can divide soldering into two basic types:

  • Soft soldering - temperature below 450 °C
  • Brazing - temperature above 450 °C

Types of solderingThese methods differ in the temperature used during operation. The soldering temperature depends on the solder we will be using. The optimum temperature for proper soldering is about 30 to 50 °C higher than the temperature at which the binder melts. This allows us to see the relationship between the type of soldering and the fusibility of the binder.

For soldering soft We use solders with a melting point of approximately 400 °C. This soldering is used for joining more delicate metals.

For soldering hard whereas we will use medium-melting metals. It will be a good choice for more robust components.

Soft soldering

It is a method that is often used in households. The process is relatively simple and at a low temperature. It should not cause any difficulties for the person performing it. With this method, we can easily do it ourselves with the simplest soldering iron.

Soft solder will be the right choice for joining parts made of steel, copper, brass or zinc. It can also be used to join parts made of the metal alloys mentioned earlier. This will ensure an accurate and uniform joint. Ready-made soft solders can be obtained in several forms. We can find wires, sticks or even powder.

Brazing

In contrast to soft soldering, to brazing The simplest soldering iron may not be enough. Then we will need professional tools. Experience in the trade may also prove useful. We can make solders whose temperature does not exceed 450 °C by ourselves. However, some metals require soldering temperatures that are up to five times higher. In extreme cases, we can already talk about industrial soldering. This is carried out by specialists using professional tools.

The most popular hard solders are silver mixtures. With these, we can join most metals together. Copper-phosphorus ones will work well for joining copper brass or bronze components. When brazing stainless steel, a nickel binder will work well. Using copper binder, we can join parts made of steel, brass and tin alloys.

We can use brazing to join copper pipes. We can also use it in automotive or refrigeration applications.

Preparation for soldering

Before we start soldering, we need to remember a few things. The parts to be soldered should be properly aligned with each other, and the gap between them should be taken care of. This should be approximately 0.04 mm. Maintaining the correct distance between the parts ensures that the solder penetrates well into the materials to be joined and that the joint is consistent. To ensure that the soldering process is carried out without unnecessary complications, it is worth paying attention to the thermal expansion of the components. This is important because this parameter can vary depending on the type of metal used. Then, all that remains is to clean the materials and degrease them. Any traces of corrosion, oil or paint are removed using specialised agents. If this step is omitted, the flux and binder will be unevenly distributed and the whole will not heat up to the same temperature. Worse still, the metal may then oxidise when heated.

Soldering

Selecting the right flux is crucial. We have solders available on the market that contain this chemical in them. The flux will make the soldering process more efficient. Next, we should position the parts we will be joining together in the most convenient way for us to solder. A good solution may be to place the parts on bases made of materials that will not conduct heat. Ceramic ones will work well.

The soldering process should take place at the correct temperature. Only the parts to be soldered should be heated. When we are dealing with larger surfaces in order to heat them up, a gas torch, for example, can be helpful. Once the flux is uniform, we know that the components have heated up evenly. Now simply apply a wire of solder and hold until melted. This will allow the components to fuse together. If we run out of flux, let's not panic. We can add it at any time. This is even better, then the solder is smoother.

What if the soldering doesn't go our way?

Once the process is complete, the soldered joint should be cleaned. It is a good idea to immerse the still warm components in warm water so that the flux peels off. A wire brush can be used to remove any remaining binder.

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