Soldering is a process in which metals that have been heated and treated to form a molten state and flowed together, welding them together. This is commonplace in a variety of applications, such as plumbing and electrical work. One type of soldering method is core soldering and it utilizes a particular type of solder that has a specific alloy configuration.
Core soldering is a type of soldering that uses special soldering wires which contain a fluxing agent that is used to lower the solidus temperature of the base metal being used. This fluxing agent is made up of a combination of chemicals and agents that help the solder form a strong adhesion to the metal being soldered by creating a thin layer of liquid metal that helps to fuse the two materials together.
There are different types of core soldering wire, but the most common types are the Rosin and Acid core soldering wires. These core soldering wires are mostly made from tin or lead alloys, but there are also some available that have other materials in the core, like copper and silver.
The Rosin core soldering wire is most commonly used with copper and other copper alloys, due to its low melting point and its ability to form a strong bond with copper. It is also often used with electrical components like terminals. Rosin core soldering also leaves less residue than other soldering wires and gives a strong, uniform joint. The common Rosin core soldering wires come in the following types and grades of solder:
● P-60: Recommended for soldering copper, nickel and silver
● P-70: Recommended for soldering tin and zinc
● P-80: Recommended for soldering brass, aluminum, and stainless steel
The Acid core soldering wire is best suited for soldering on steel and is usually used for larger projects that require again, such as in factory and automotive applications. The acid in the core helps break down the oxides that can form on the steel and create a strong bond. The common Acid core soldering wires come in the following types and grades of solder:
● T-50: Lowest temperature soldering wire, best with iron and steel
● T-60: Medium temperature soldering wire, best with cast iron and large steel components
● T-80: Highest temperature soldering wire, best with non-ferrous metals like copper and aluminum
In addition to the type and grade of the soldering wire, it can also be purchased in a variety of thicknesses, depending on the project. The certificate of analysis (COA) for each rosin or acid core soldering wire will provide the grade, type and thickness of the particular solder being purchased. It is important to purchase the correct solder wire for each application and to also read the directions for use provided on the package prior to use.
Overall, Core Soldering is one of the most commonly used processes for joining two pieces of metal together. In order for a successful joint to be made, the correct type and grade of solder must be chosen and the application needs to be conducted following the package instructions. By selecting the correct solder wire, a strong and long lasting joint can be made that will be perfect for the chosen application.
