What are the Various Solder Types?

What are the Various Solder Types?

Posted by Staff - Soldertraining on Jan 11th 2023

A PCB’s solder is the connection between the electronic component and the PCB pads. This conductive glue fuses the circuit board’s substrate pads and traces to the components to become a single circuit. Modern electronics would be very different if we didn’t have access to this useful alloy.

It can be worthwhile if you want to boost production floor workmanship; you must know more about solder types; at the same time, you can join Indiana solder training to learn the right techniques and train to be best in soldering.

How Do You Solder?

The word “solder” is a derivative of the Middle English word “soudur,” which comes from the Latin verb solidarity, which means “to make solid.” It is a fusible alloy with a low melting point used to join metal workpieces. The concept of joining two or more metals with a lower melting point alloy has been present for thousands of years, although modern solder is often a mixture of tin, lead, and flux.

Know The Various Solder Types

Choosing the best solder for your project might be difficult because there are so many varieties available on the market nowadays. Fortunately, you may focus your search by using the three primary categories of solder that exist:

It was lead-lead solder that was used at the advent of electronics. The most typical composition has a melting point between 180 and 190 °C and is a 60/40 (tin/lead) blend. Tin, also referred to as soft solder, is chosen because it has a lower melting point than lead, which prevents the development of tin whiskers. The tensile and shear strengths improve with increasing tin content.When the EU started limiting the use of lead in consumer electronics, leadless solder took off. Manufacturers employing lead-free solders may be eligible for tax incentives in the US. Utilizing more recent annealing methods, adding additives like nickel, and applying conformal coatings can all help reduce tin whiskers. Lead-free solders typically have a melting point that is greater than regular types of solders.

Flux core solder is offered for purchase as a spool of “wire” that contains a reducing chemical at the center. To provide a cleaner electrical connection, the flux is released during soldering and decreases (reverses oxidation of) metal at the site of contact. Additionally, it enhances the solder’s wetting characteristics.

Understanding Of Solder Mixes

Lead, tin, and flux are the three major components of solder; do you remember them? Based on the relative ratios of these ingredients, there are numerous solder types on the market. Other chemicals and metals may be added to solder to give it certain qualities or improve its conductivity, further complicating issues.When selecting solder mixes, it’s crucial to be aware of any potential galvanic corrosion or brittleness brought on by bringing different metals into contact with one another. Thanks to the large range of solder blends, you can discover the ideal combination of properties for your electronic equipment.


In conclusion, there are three primary types of solder: flux, lead-based, and lead-free. Regarding reliability and understanding, lead-based solders are chosen in mission-critical applications like aircraft or medical electronics. Electronics that must adhere to environmental and health standards can use lead-free solders. The rosin-reducing agent in flux types of solders, which is released during soldering and removes oxidation from the bonding point, is also present in the solder.