Heat Pipe & Heat Exchanger Tube End Closing Machines | Copper, Stainless, Header and Coil Tubes – Flat, Dome or Holed Ends
Closing the ends of heat pipes and heat exchanger tubes
Heat pipes, heat exchanger tubes, headers and manifolds, condenser and coil tubes, and electric heater tubes all need a tube end that is closed and leak-tight. A welded cap or brazed plug adds porosity, a heat-affected zone and oxide scale. TONG DA closing machines cold-spin the tube end into one piece with the tube: no weld, no plug, no heat, and copper stays clean for brazing. Since 1989 our closing machines have been shipped to Korea, the USA, Germany, Turkey, the UK, India and mainland China, including heat exchanger makers in Turkey and the Middle East.
Which machine for which tube
| Tube end | Tube OD | Machine |
|---|---|---|
| Flat end, closed or with hole | Ø10–25 mm | TD-21025 flat-end closing machine |
| Dome end, closed or with hole | Ø10–40 mm | TD-31040 heat pipe & heat exchanger closing machine |
| Larger headers and coils | Ø15–50 mm | TD-31050 heat exchanger & header closing machine |
| Thick wall, programmable dome, flat or hole | Send drawing | TD-382 NC servo closing machine |
| Automatic loading and unloading | Send drawing | TD-332 |
Materials: copper, stainless steel (304, 316), carbon steel and aluminium. Each station of a multi-station machine is independent, so one machine can close three sizes, or three of the same size for volume.
Why spin closing for heat transfer tubes
- One piece with the tube: no weld porosity and no plug gap.
- The wall thickens at the closure, which suits pressure and thermal cycling.
- No heat: no oxide scale, no discoloured stainless, copper ready for brazing.
- Dome radius and hole size adjusted on the machine without a mold change.
Before and after closing
Copper and stainless tubes can be cut to length without chips on the TD-41860 and reduced on the TD-876. For small lots, use our tube end closing service in Taiwan.
Videos
More videos: youtube.com/@closingmachine
FAQ
Is the closed end leak-tight?
The closure is one piece with the tube (see the leak test video). Send your tube and test requirement; we close samples for your own pressure test.
Flat or dome end?
See dome vs flat tube end closing.
Can we braze or weld after closing?
Yes. Cold closing leaves no oxide scale, so drilling, brazing and welding of branch tubes can follow directly.
How do we start?
Send tube OD × wall, material and the end drawing to sales@tdco.com.tw.
Türkçe
Isı borusu, ısı eşanjörü borusu, kollektör ve serpantin boruları için boru ucu kapama makineleri: bakır, paslanmaz ve karbon çelik boru ucu soğuk döndürülerek tek parça kapatılır; kaynak, tapa ve ısıtma yok. Numune için: sales@tdco.com.tw.
Русский
Станки для закрытия торцов тепловых трубок, труб теплообменников, коллекторов и змеевиков: торец медной, нержавеющей или стальной трубы закрывается холодной ротационной обкаткой в одно целое с трубой, без сварки, заглушки и нагрева. Образцы: sales@tdco.com.tw.
Español
Cerradoras de extremos de tubo para heat pipes, tubos de intercambiadores de calor, colectores y serpentines: el extremo de tubo de cobre, inoxidable o acero se cierra por rotación en frío en una sola pieza, sin soldadura, tapón ni calor. Muestras: sales@tdco.com.tw.
Names used in different markets
English: heat pipe end closing machine, heat exchanger tube end closing machine, header / manifold tube closing, copper tube end sealing machine, tube spinning machine. Turkish: ısı eşanjörü boru ucu kapama makinesi. Russian: станок для закрытия торцов труб. Spanish: cerradora de tubos para intercambiadores de calor. Chinese: 热管封口机、换热器管封头机、集管封口机、铜管封口机。
