Heat Pipes and Heat Exchangers

What a heat exchanger tube end needs

Heat pipes, heat exchanger tubes and shell-and-tube bundles see internal pressure and repeated thermal cycling after closing; the closure must have no weld porosity and no plug gap. TONG DA closing machines cold roll-spin the tube end into a seamless one-piece closed end with the wall thickened at the closure; stainless steel keeps its color and temper.

TD-31040 closing machine for heat exchanger tubes
TD-31040 closing machine for heat exchanger tubes		Heat exchanger coil
Heat exchanger coil		Spin-closed copper tube end
Spin-closed copper tube end

Dome end or flat end

MachineEnd shapeBest for
TD-31040Dome, optional center holeStainless and heavy-wall tube, high pressure
TD-21025FlatSmall copper heat pipes whose end face mates to a heat sink

Tube materials

Stainless steel (304, 316), copper, carbon steel, aluminum. Sizes outside the standard range are evaluated on sample.

How to start

Send tube OD × wall × material × length and the closed-end drawing; TONG DA trial-closes and returns samples before you decide between a machine and contract closing.

Related videos

TD-31040 Heat Exchanger Header Pipe Closing OD21.3×2.5t
TD-31040 Heat Exchanger Header Pipe Closing OD21.3×2.5t		OD32×1.0 Copper Tube End Sealing – Heat Exchanger & Condenser
OD32×1.0 Copper Tube End Sealing – Heat Exchanger & Condenser		TD-21025 Flat End Sealing – Heat Pipe & Heat Exchanger Tubes
TD-21025 Flat End Sealing – Heat Pipe & Heat Exchanger Tubes

More machine videos on our YouTube channel: youtube.com/@closingmachine

All heat pipe and heat exchanger machines on one page

Flat, dome and programmable closing machines compared by tube size, with videos: see heat pipe & heat exchanger tube end closing machines.

Heat Pipe & Heat Exchanger Tube End Closing Machines | Copper, Stainless, Header and Coil Tubes – Flat, Dome or Holed Ends
Heat Pipe & Heat Exchanger Tube End Closing Machines | Copper, Stainless, Header and Coil Tubes – Flat, Dome or Holed Ends
End closing machines for heat pipes, heat exchanger tubes, headers and manifolds, condenser and coil tubes and heater tubes: TD-21025 flat ends, TD-31040 / TD-31050 dome ends, TD-382 for thick wall and programmable shapes. Cold spin closing in one piece, no weld, no plug, no oxide scale. Samples on your tube first.
TD-382 Stabilizer Bar Closing Machine | NC Servo Pipe End Closing for Torsion Beam & Heavy-Wall Tube
TD-382 Stabilizer Bar Closing Machine | NC Servo Pipe End Closing for Torsion Beam & Heavy-Wall Tube
Stabilizer bar and torsion beam tube closing machine. TD-382 is TONG DA’s NC servo tube end closing machine. The forming rollers are driven by servo X and Y axes and follow a programmed path, so the dome radius can be set freely and flat area and center hole are program settings too; a product change is a program recall. Built for large-diameter, heavy-wall tube and for parts with demanding or varied end shapes: automotive stabilizer bars and torsion beams, large shock absorber cylinders, hydraulic cylinder tubes, industrial gas springs. Used in a Japanese automotive supply chain, running in plants in Japan, Thailand and China.
TD-31050 Shock Absorber Tube Closing Machine | Two-Station Pipe End Closing, Ø15–50 mm
TD-31050 Shock Absorber Tube Closing Machine | Two-Station Pipe End Closing, Ø15–50 mm
TD-31050 is a patented hydraulic two-station arc-top closing machine for tube OD Ø15–50 mm and wall 0.8–3.0 mm. It cold roll-spins the tube end fully closed or with a center hole – no heating, welding or plastic plug. PLC touch control, inverter spindle speed and a strengthened forming unit make it suited to shock absorber cylinders and larger tubes.
TD-311 / TD-332 Automatic Tube Sealing Machine | Auto-Feeding Single-Station Pipe End Closing
TD-311 / TD-332 Automatic Tube Sealing Machine | Auto-Feeding Single-Station Pipe End Closing
TD-311 (also called TD-332) is a single-station auto-feeding tube closing machine for gas spring and gas lift cylinders Ø15–28 mm, wall 1.0–2.0 mm, length 100–500 mm. Tubes are fed from a hopper, closed and unloaded automatically; the end is cold roll-spun into a dome with adjustable arc and hole – no weld or plug. Hydraulic clamping and PLC touch control for high-volume production.
TD-21025 Flat-End Tube Closing Machine | Flat Sealing for Furniture, Heat Pipes & Strollers
TD-21025 Flat-End Tube Closing Machine | Flat Sealing for Furniture, Heat Pipes & Strollers
TD-21025 is a patented hydraulic flat-end tube closing machine. It cold roll-spins a metal tube end into a flat closed bottom or one with a center hole – no heating, welding or plastic plug, with a smooth, safe finish. For furniture, baby chairs and strollers, heat pipes and heat exchanger tubes; PLC touch control.
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