Soledering

Soldering is a method that connects metal components using a low-temperature alloy, perfect for precise tasks because it preserves the base materials.

What is soldering?

Soldering is a method of joining two metal parts using a filler metal (solder) that melts at a lower temperature than the base materials. Unlike welding, soldering does not melt the metals being joined, making it ideal for delicate work.

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Soldering & Brazing

History of soldering

Soldering dates back over 4,000 years, first used by ancient Egyptians and Mesopotamians for jewelry and metalwork. Over time, it became essential in plumbing, electronics, and manufacturing, evolving with modern materials and tools like propane torches for faster, stronger connections.

How does it work?

When heated, the solder melts and flows between the metal surfaces, creating a strong and conductive bond as it cools and solidifies. Flux is used to prevent oxidation and ensure a clean connection. The key to a successful solder joint is even heat distribution and proper solder flow. The molten solder spreads and fills the gap between the metals, creating a secure connection as it cools. 

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Frequently asked questions

Yes! Propane torches provide consistent heat and are perfect for soft soldering applications like plumbing, metalwork, and repairs. They heat metals quickly and evenly, ensuring a strong bond. 

  • Lead-free solder (tin-copper or tin-silver) is recommended for plumbing and general use. 

  • Lead-based solder is sometimes used for non-drinking water applications. 

  • Silver solder provides extra strength for metal repairs. 

Yes! Flux is essential as it prevents oxidation, helps the solder flow, and ensures a strong bond. Many plumbing solders come with flux, but for best results, apply additional flux before heating. 

Propane torches reach temperatures of 1,982 °C (3,500°F), but for soldering, you only need to heat the metal to 200-300°C (392-572°F), depending on the solder type. A good torch provides precise control to avoid overheating.

  • Use a torch with adjustable gas flow to control the intensity. 

  • If you are soldering copper joints, use a Cyclone Burner for even heat distribution 

  • Heat the metal, not the solder—the solder should melt by contact with the heated metal, not direct flame. 

Common reasons include: 

  • Dirty or oxidized metal – Clean the surfaces before soldering. 

  • Not enough flux – Always apply flux to ensure proper adhesion. 

  • Uneven heating – Ensure the joint is heated evenly before applying solder. 

  • Stainless steel can be soldered with specialized flux and silver-based solder.

  • Soft soldering (below 450°C (842°F) is used for plumbing, electronics, and repairs. 

  • Brazing (above 450°C (842° F) creates stronger joints, often using propane or MAPP gas with a higher-temperature brazing rod. 

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