Solder the Joints — Cool and Clean the Joint
Part of project
How to Solder Copper Pipes for a Permanent, Watertight Joint · Step 9 of 10
In this video
With the pipes and fittings fluxed, use a propane torch to heat the joints. Apply heat primarily to the fitting, not the pipe. Once the flux starts to bubble and the copper is hot enough, touch the solder to the edge of the joint. The heat will draw the solder into the joint via capillary action, filling the gap and creating a seal. For the final, difficult joint in the watery valve box, first stuff a piece of bread into the pipe to act as a temporary dam against residual water. Then, proceed with soldering.
Goal: Plumbing Pipes Installation
- Be extremely careful when using a propane torch. Keep it away from flammable materials and always have a fire extinguisher nearby.
Used in this video
- Propane Torch — Heating the copper pipes and fittings for soldering.
- Safety Glasses — Protecting eyes from heat and solder.
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.
Solder the Joints — Cool and Clean the Joint
Part of project
How to Solder Copper Pipes for a Permanent, Watertight Joint · Step 9 of 10
In this video
With the pipes and fittings fluxed, use a propane torch to heat the joints. Apply heat primarily to the fitting, not the pipe. Once the flux starts to bubble and the copper is hot enough, touch the solder to the edge of the joint. The heat will draw the solder into the joint via capillary action, filling the gap and creating a seal. For the final, difficult joint in the watery valve box, first stuff a piece of bread into the pipe to act as a temporary dam against residual water. Then, proceed with soldering.
Goal: Plumbing Pipes Installation
- Be extremely careful when using a propane torch. Keep it away from flammable materials and always have a fire extinguisher nearby.
Used in this video
- Propane Torch — Heating the copper pipes and fittings for soldering.
- Safety Glasses — Protecting eyes from heat and solder.
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.