Want to connect PPR pipes properly? The welding technique you use can make the difference between leaky plumbing joints and a system that lasts for decades.
Unlike traditional systems that rely on glue, clamps, or threaded tube fittings, PPR pipes use heat fusion to form seamless pipe to pipe weld connections—bonds that are often stronger than the pipe itself.
This guide walks you through the complete PPR pipe welding process, even if you’ve never worked with these materials before.
Preparation
Before starting any PPR pipe joint project, you need the right tools and materials on hand.
Taking time to prepare properly will save you headaches and ensure your weld on pipe fittings are leak-free.
Tools Required
- PPR welding machine with appropriate sized socket heads
- Pipe cutter or sharp scissors designed for plastic pipes
- Measuring tape and permanent marker
- Clean cloth or paper towel
- Support clamps (for larger diameter pipes)
Materials Needed
- PPR pipes cut to required lengths
- PPR pipe connectors, including elbows, tees, and PPR pipe couplings suited to your application
- Marking template (optional but helps with consistent depth marking)
Preparing the PPR Pipes
Measure and cut each pipe to the exact length required using a pipe cutter or heavy-duty scissors.
Make sure to cut at a perfect right angle—slight angles can compromise the pipe to pipe weld integrity.
Clean the pipe ends to remove burrs and wipe them with a dry cloth. Mark the insertion depth to help you weld accurately.
Preparing the PPR Fittings
Inspect all fitting sanitary components for damage, dirt, or moisture before welding.
Cleanliness is critical, as foreign material inside your PPR pipe connector or pipe can cause weak plumbing joints.
Also make sure that you’re using the correct type and size of fitting for your application—whether it’s a 90° elbow, tee, or PPR pipe coupling.
Step-by-Step Welding Procedure
Step 1: Set Up the Welding Machine
Plug in the welding machine and attach the correct socket heads based on your pipe and tube fitting size.
Let it heat to the proper fusion temperature (around 260°C / 500°F) until the indicator shows it’s ready.
Step 2: Prepare for Welding
Check once more that your pipe is cut square, marked properly, and both pipe and fitting are clean.
Arrange everything so that you can move quickly once the heating begins—timing matters in PPR pipe welding.
Step 3: Heat the Components
Insert the pipe into one side of the heating socket and the weld on pipe fitting into the other.
Push both firmly until they reach the stops in the socket.
Hold them steady without rotating for the exact recommended heating time based on your pipe size.
Step 4: Join the Heated Components
Remove both components from the tool and immediately insert the pipe into the fitting.
Push straight in—don’t twist or rotate—and hold firm until the joint sets.
This step is what creates a long-lasting pipe to pipe weld with zero mechanical fasteners.
Step 5: Allow Proper Cooling
Let the fused joint cool naturally for the full duration listed in the welding time chart.
Avoid touching or testing the system until the PPR pipe joint has fully solidified.
Recommended Time For PPR Systems Fusion Joints
Getting the timing right is absolutely critical for strong connections:
| Pipe Diameter (mm) | Heating Time (seconds) | Joining Time (seconds) | Cooling Time (minutes) |
| 16 | 5 | 4 | 2 |
| 20 | 5 | 4 | 2 |
| 25 | 7 | 4 | 2 |
| 32 | 8 | 6 | 4 |
| 40 | 12 | 6 | 4 |
| 50 | 18 | 6 | 4 |
| 63 | 24 | 8 | 6 |
| 75 | 30 | 8 | 8 |
| 90 | 40 | 8 | 8 |
| 110 | 50 | 10 | 8 |
Heat for too little time and you’ll get incomplete fusion and weak joints. Heat for too long and you can damage the material and weaken the connection. Always follow the recommended times for your specific pipe size—don’t try to rush it.
Conclusion
Welding PPR pipe fittings properly ensures leak-proof, maintenance-free plumbing for years to come.
When done right, each PPR pipe joint becomes a seamless extension of the system—no threads, glues, or mechanical failures to worry about.
At DESO Group, our product range includes:
- Standard and reinforced PPR pipe connectors
- Fiber and aluminum composite pipes
- Double-layer and UV-resistant pipe solutions
- All sizes of weld on pipe fittings and fitting sanitary products
We’ve tested every pipe series against time-temperature variables to ensure perfect pipe to pipe weld results every time.
Contact our technical team if you need more information regarding our process or specific advice for your particular application.
