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Cored Solder Wire – Rosin Flux Cored Solder Wire

Cored Solder Wire or Rosin Flux Cored Solder Wire is Solder Wire with Flux in the Core or Center of the Wire for Better Soldering Results.

Here we will learn about Cored Solder Wire or Flux Cores Colder Wire, its Advantages and Uses in Soldering.

What is Flux Cored Solder Wire?

Cored Solder Wire or Rosin Flux Cored Solder Wire is soldering wire with rosin flux in the core or center for better soldering results. It is an alloy used in the electronics industry for soldering electronic components onto the printed circuit board or two pieces of metal or wires.

Solder can be leaded (Sn/Pb) or lead-free (with no lead). Both leaded and lead-free solder can be either flux cored (with flux in the core of the wire) or solid (with no flux in the core.)

Flux Cored Solder Wire

Solder Flux

Solder flux is a kind of chemical used by electronic companies to clean surfaces of PCB before soldering electronic components onto the board. The main function of using flux in any circuit board assembly or rework is to clean and remove any oxide from the board prior to soldering. Solder flux helps to deoxidize metals (copper tracks on the PCB and leads of electronic components) and helps better soldering and wetting.

What is Cored Solder Wire?

Cored solder wire is hollow with flux in the core. This flux can be Rosin Activated Flux (RA), Rosin Mildly Activated Flux (RMA) or No-Clean Water Soluble Flux. It is available in various combination of alloy like Tin-Lead (Sn/Pb) or Lead-Free and in various diameters ranging from 0.2 to 1.5mm. It is basically used in hand soldering or wave soldering and rework / repairing.

Solid solder wire doesn’t have this flux in the core. They are solid.

Advantages of Rosin Flux Cored Solder Wire

Rosin Flux Cored Solder Wire has several advantages over solid wire. As explained above, oxides, oil, grease and other such unwanted material can get deposited on the copper tracks of the printed circuit board and the surface of electronic components leads. This oxide and all unwanted impurities must be removed before soldering to get perfect solder joints. These impurities can affect the performance of the circuit board. Soldering flux does this job. Flux removes oxides and other unwanted impurities form the surface of the copper tracks of the board and from the component lead surface. Use of this solder wire with flux in the core saves both time and money.

Soldering with Flux Cored Solder Wire Vs Solid Solder

With solid wire, one has to use flux separately to clean unwanted impurities. This flux is applied on the board and on the lead of the electronic components before hand soldering with a soldering station or soldering iron. In wave soldering, flux is sprayed using fluxer.

With flux cored solder, there is no need to apply flux separately. The flux present in the wire will keep cleaning the board and components leads while soldering. Alpha Cookson are worldwide leaders and manufacture of all types of solder wire, solder paste, solder flux, solder preforms, solder bar, lead free solder and other soldering related products for the electronics manufacturing and PCB assembly industry.

FAQs: Solder Wire with Flux Rosin Core

When heated, the flux within the solder wire becomes active and removes oxidation from the surfaces being soldered. This allows the molten solder to flow smoothly, creating a strong bond between the components and the PCB. The flux also prevents the formation of new oxides during the soldering process.

Flux cored solder wire offers several advantages. It simplifies the soldering process by eliminating the need for a separate flux application. The rosin flux cleans the surfaces, enhances wetting, and improves solder flow. This type of solder is widely used for electronics manufacturing.

While solder wire with flux rosin core is suitable for many soldering tasks, it might not be the best choice for certain specialized applications. For instance, in situations where extremely high temperatures are involved, or when soldering metals with unique properties, using a more specific soldering material may be recommended.

Yes, safety precautions are important. When soldering, ensure proper ventilation in your workspace to prevent inhalation of fumes. Wear safety goggles to protect your eyes from potential splatter. Additionally, avoid direct contact with the heated soldering iron and molten solder to prevent burns. Always follow the manufacturer's instructions and best practices for safe soldering.

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Santosh Das

Santosh, founder of this Electronics Tutorial Website, is an Electronics Geek, Blogger and Young Entrepreneur. He possesses vast experience in the field of electronics, electronic components, PCB, Soldering, SMT, Telecommunication, ESD Safety, and PCB Assembly Tools, Equipment and Consumables. Keep visiting for daily dose of Tips and Tutorials.

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36 Responses

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  11. May 6, 2014

    […] Flux Cored Solder Wire: It is always better to use flux cored solder wire. Flux will help to remove any oxide and contamination from the surface of the PCB and leads of the electronic components. This will help better soldering. […]

  12. July 21, 2014

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  14. July 22, 2014

    […] range of flux cored solder wire includes no-clean, water-soluble and activated rosin fluxes in both leaded (Tin-Lead) and Lead-Free […]

  15. July 7, 2015

    […] soldering iron is a simple plug and use tool for soldering solder wire and electronic components to the PCB. These soldering irons are available in different wattage such […]

  16. February 28, 2019

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  17. March 5, 2019

    […] paste away from pad to somewhere under the component, it reflows there and form a bead of solder which comes out from under the component […]

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  22. March 17, 2019

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  23. March 21, 2019

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