Heat the Joint and Apply Solder — Heat the Joint
Part of project
How to Solder Copper Pipes for a Permanent, Watertight Joint · Step 7 of 10
In this video
Ignite the propane torch and apply the flame primarily to the body of the copper fitting, not the pipe itself. Heat the joint evenly until the flux begins to bubble and smoke. Unroll a few inches of solder. Touch the tip of the solder to the joint seam, on the opposite side from the torch's flame. The heat from the fitting should melt the solder, which will be drawn into the joint by capillary action, creating a silver ring. Once the joint is filled, remove the heat and solder. Let it cool for a moment, then use a damp rag to wipe the joint clean.
Goal: Solder the Joint
- The heat from the pipe and fitting should melt the solder, not the direct flame of the torch.
- Apply heat to the bottom of the fitting to draw the solder down and around, ensuring a complete seal.
- Always have a fire extinguisher nearby and be aware of your surroundings when using a torch.
Used in this video
- Propane Torch (brand: TurboTorch, Tool Type: Soldering Iron, Power Source: Propane) — Heating the copper pipe and fitting to the solder's melting point.
- Rag (Material: Cloth) — Wiping the soldered joint clean for a professional finish.
613K subscribers
FAQs
What are the most critical safety precautions I need to take when soldering copper pipes?
Always wear safety glasses and gloves to protect from heat and flux. Ensure adequate ventilation, keep a fire extinguisher or bucket of water nearby, and use a heat shield (like the Oatey 9 in. x 12 in. Hands-Free Solder Heat Shield) to protect surrounding flammable materials from the torch flame and hot pipes.
Why is cleaning and deburring the pipe and fitting so crucial before applying flux and soldering?
Thorough cleaning with a fitting brush and sandpaper removes oxides and contaminants, which are essential for the solder to properly flow and adhere via capillary action. Deburring with a tool like the Husky 1-5/8 in. Inner/Outer Reamer ensures the fitting seats correctly and prevents turbulence in water flow, promoting a perfect solder joint.
How do I know I'm using enough solder, and what commonly causes a joint to leak after soldering?
You've used enough solder when you see a complete, continuous ring of solder around the joint's circumference, indicating full capillary fill. Leaks are often caused by insufficient or uneven heat application, improperly cleaned surfaces, or applying too little solder, which results in an incomplete or 'cold' joint.
Can I use a regular propane torch, or do I need a MAPP gas torch for soldering copper pipes?
While a basic propane torch might suffice for smaller pipes (1/2" - 3/4"), a MAPP gas torch (such as the Flame King High Intensity Propane Torch Head) provides a hotter flame. This is more efficient for larger pipes and quicker heating, reducing the risk of overheating the pipe or burning off the flux prematurely, which are common beginner mistakes.
Heat the Joint and Apply Solder — Heat the Joint
Part of project
How to Solder Copper Pipes for a Permanent, Watertight Joint · Step 7 of 10
In this video
Ignite the propane torch and apply the flame primarily to the body of the copper fitting, not the pipe itself. Heat the joint evenly until the flux begins to bubble and smoke. Unroll a few inches of solder. Touch the tip of the solder to the joint seam, on the opposite side from the torch's flame. The heat from the fitting should melt the solder, which will be drawn into the joint by capillary action, creating a silver ring. Once the joint is filled, remove the heat and solder. Let it cool for a moment, then use a damp rag to wipe the joint clean.
Goal: Solder the Joint
- The heat from the pipe and fitting should melt the solder, not the direct flame of the torch.
- Apply heat to the bottom of the fitting to draw the solder down and around, ensuring a complete seal.
- Always have a fire extinguisher nearby and be aware of your surroundings when using a torch.
Used in this video
- Propane Torch (brand: TurboTorch, Tool Type: Soldering Iron, Power Source: Propane) — Heating the copper pipe and fitting to the solder's melting point.
- Rag (Material: Cloth) — Wiping the soldered joint clean for a professional finish.
Frequently Asked Questions
What are the most critical safety precautions I need to take when soldering copper pipes?
Always wear safety glasses and gloves to protect from heat and flux. Ensure adequate ventilation, keep a fire extinguisher or bucket of water nearby, and use a heat shield (like the Oatey 9 in. x 12 in. Hands-Free Solder Heat Shield) to protect surrounding flammable materials from the torch flame and hot pipes.
Why is cleaning and deburring the pipe and fitting so crucial before applying flux and soldering?
Thorough cleaning with a fitting brush and sandpaper removes oxides and contaminants, which are essential for the solder to properly flow and adhere via capillary action. Deburring with a tool like the Husky 1-5/8 in. Inner/Outer Reamer ensures the fitting seats correctly and prevents turbulence in water flow, promoting a perfect solder joint.
How do I know I'm using enough solder, and what commonly causes a joint to leak after soldering?
You've used enough solder when you see a complete, continuous ring of solder around the joint's circumference, indicating full capillary fill. Leaks are often caused by insufficient or uneven heat application, improperly cleaned surfaces, or applying too little solder, which results in an incomplete or 'cold' joint.
Can I use a regular propane torch, or do I need a MAPP gas torch for soldering copper pipes?
While a basic propane torch might suffice for smaller pipes (1/2" - 3/4"), a MAPP gas torch (such as the Flame King High Intensity Propane Torch Head) provides a hotter flame. This is more efficient for larger pipes and quicker heating, reducing the risk of overheating the pipe or burning off the flux prematurely, which are common beginner mistakes.