Closed-chamber
FXT20 + C-series
Straight tube-to-tube closed-chamber welds. φ3.175–168 mm. Semiconductor UHP, biopharma WFI, sanitary food.
FYID-Feiyide
FYID U12-U25 Soldadora Orbital Automatizada Tubos en U (Data Centers IA e Intercambiadores)
FYID U12-U25 Soldadora Orbital Automatizada Tubos en U (Data Centers IA e Intercambiadores)
Precio habitual
$16,560.00
Precio habitual
Precio de oferta
$16,560.00
Precio unitario
por
Los gastos de envío se calculan en la pantalla de pago.
No se pudo cargar la disponibilidad de retiro
U-Bend tube socket welder · ≤φ25 mm
FXT20 Pro U-Bend Tube Orbital Welder.
Pulse TIG socket welder for tube-in-tube U-bend joints. Four U-series heads (U12 / U16 / U20 / U25) cover the U-tube heat exchanger and AI data center cooling tube range.
Choose head
U12 ≤φ12 mm
U16 ≤φ16 mm
U20 ≤φ20 mm
U25 ≤φ25 mm
01 / What it does
A purpose-built orbital welder for one specific joint geometry: U-bend socket.
The FYID-Feiyide FXT20 Pro + U-series is an automated orbital GTAW (TIG) welding system purpose-built for circumferential fillet welds between U-bend tubes and straight tubes — the “tube-in-tube” socket joint geometry found in heat exchanger U-tube bundles, AI data center liquid cooling modules, and pharmaceutical double-tube heat exchangers.
This is not a general-purpose orbital welder adapted for U-bend joints. The FXT20 Pro + U-series was designed from the ground up for three failure modes unique to this joint geometry: arc length instability on the inner tube surface during rotation, burn-through on thin combined wall thickness at the socket, and insufficient argon protection of the 316L stainless steel inner wall during overhead passes.
The 5 A arc initiation and full closed-loop servo rotation deliver consistent heat input and arc length on every joint in a production batch, with per-weld parameter logging that supports quality inspection traceability for rack-level cooling system commissioning.
The dual-channel integrated argon protection — external weld pool and internal tube simultaneously — produces silver-white oxide-free weld interiors on 316L stainless steel, preventing iron oxide particulate from entering the cooling loop and reaching GPU cold plate micro-channels.
02 / Available heads
Four U-series heads covering φ12 to φ25 mm tube.
U12
≤φ12 mm · ≤1.6 mm combined wall
1.5 kg · Min tube pitch ≥18 mm · Min straight extension ≥16 mm. Densely-packed U-tube bundles.
U16
≤φ16 mm · ≤1.6 mm combined wall
2.0 kg · Min tube pitch ≥18 mm · Min straight extension ≥16 mm. Standard refrigeration and HX U-tube.
U20
≤φ20 mm · ≤1.6 mm combined wall
3.0 kg · Min tube pitch ≥24 mm · Min straight extension ≥16 mm. Medium-bore U-tube bundles.
U25
≤φ25 mm · ≤1.6 mm combined wall
3.5 kg · Min tube pitch ≥30 mm · Min straight extension ≥16 mm. Large U-tube HX, double-tube pharma.
+ FXT20 Pro power source
220 V single-phase · 4.5 kVA · 5–200 A DC · 100% duty @ 155 A
All four U-series heads (U12 / U16 / U20 / U25) run on one FXT20 Pro. Industrial PLC + 10-inch touchscreen, 8-zone × 8-stage parameter control, 200 program groups, full closed-loop servo rotation with <1 ms response. Dual-channel integrated argon protection (external weld pool + internal tube simultaneous). For straight tube-to-tube orbital welds, see the FXT20 + C-series closed-chamber platform.
03 / U-tube bundle layout requirements
Tube bundle geometry the U-series head must be able to access.
Before ordering, confirm your bundle drawing against these access constraints. The U-series head must physically position and rotate at each tube-in-tube socket joint. If tube pitch or straight extension does not meet the minimum for the selected head, the head cannot reach the joint.
Max tube OD
φ25 mm (U25 head) — U-tube and AI cooling modules up to this OD are supported. Above φ25 mm, contact us for a custom head assessment.
Combined wall thickness
≤1.6 mm typical — the sum of the outer tube wall and inner tube wall at the socket cross-section. This is the combined thickness the arc must fuse in a single autogenous pass.
Min tube pitch — U12
≥18 mm center-to-center (φ12 mm tube — densely-packed exchanger bundles and AI cooling modules)
Min tube pitch — U16
≥18 mm center-to-center (φ16 mm tube — standard refrigeration and heat exchanger U-tube pitch)
Min tube pitch — U20
≥24 mm center-to-center (φ20 mm tube — medium-bore bundles)
Min tube pitch — U25
≥30 mm center-to-center (φ25 mm tube — large U-tube HX and double-tube pharma)
Min straight extension
≥16 mm of straight tube section beyond the U-bend, measured from the socket joint face to the start of the bend tangent. Required for head clamping and arc rotation clearance.
U-bend minimum radius
Confirmed from the bundle manufacturer’s drawing. The head approaches from the straight-tube side; a tight bend radius that reduces available straight extension below 16 mm cannot be welded without a special head configuration — send the drawing for assessment before ordering.
Tube arrangement
Triangular or square pitch both supported. The minimum pitch constraint applies regardless of pitch pattern. For triangular pitch, pitch is measured diagonal-to-diagonal between adjacent tube centers.
What to send us before quoting: Your heat exchanger or cooling module tube bundle drawing (or dimensional table) showing tube OD, wall thickness, tube pitch (center-to-center spacing), and straight extension length beyond the U-bend. We confirm head fit and write the initial parameter program before order confirmation.
04 / Engineering specifications
Spec sheet for procurement.
Welding process
Autogenous GTAW (TIG) — DC and Pulse modes, no filler wire
Output current
5 – 200 A DC
Min arc initiation
5 A (prevents burn-through on ≤1.6 mm combined wall)
Input voltage
220 V AC ±10% or 110 V AC (selectable), single-phase
Power consumption
4.5 kVA
Welding zones
8 independent zones per circumferential weld
Stored programs
200 groups
Rotation drive
Full closed-loop servo motor with high-resolution encoder, <1 ms response (no step-loss vs stepper motors)
Torch cooling
Circulating water, flow ≥400 ml/min at 0.3 MPa
Tube OD range
≤φ25 mm across U12 / U16 / U20 / U25
Combined wall
≤1.6 mm typical (outer tube wall + inner tube wall at socket)
Materials
Austenitic stainless 304 / 316L · duplex 2205 · titanium alloy · CuNi (parameter adjustment required)
Argon protection
Dual-channel integrated — external weld pool + internal tube simultaneous
Cable length
8 m flexible standard; extension available
Certifications
CE · ISO 9001
Delivery
Confirmed by configuration, production schedule, and logistics
Warranty
12 months whole-machine; consumables excluded
05 / Procurement questions
What buyers ask before the PO.
Is the FXT20 Pro the same as the FXT20 closed-chamber?
No. They share the same compact power source class (220V single-phase 4.5 kVA 5–200A) but are different products with different head geometries. FXT20 + C-series heads are closed-chamber heads for straight tube-to-tube butt welds. FXT20 Pro + U12/U16/U20/U25 heads are U-bend socket heads for tube-in-tube fillet welds. The power source model is FXT20 Pro; the welding head series is called the U-series (U12, U16, U20, U25). The C-series and U-series heads do not interchange.
What is the difference between this and the FXT20 closed-chamber for AI cooling?
Joint geometry. AI data center cooling has two joint families: straight tube-to-tube manifold welds (use FXT20 + C-series closed-chamber) and U-bend socket joints where a return bend connects to a straight tube (use FXT20 Pro + U12/U16/U20/U25). Whether both are needed depends on the cold-plate, manifold, and return-bend design.
Can it weld CuNi 90/10 condenser tube?
CuNi alloys are listed as “compatible with parameter adjustment.” Standard pre-loaded programs do not cover CuNi by default; we develop custom procedures on request. For high-volume CuNi production runs, contact our process engineering team for procedure qualification support.
What’s the difference between this and the PT40 tube-to-tubesheet?
Different joint type. PT40 welds the tube end to the tubesheet face (the joint where a straight tube terminates at the tubesheet of a heat exchanger). FXT20 Pro + U-series welds the U-bend return socket where a U-shaped tube connects back to a straight tube section. A typical heat exchanger build needs both — PT40 for tubesheet seal welds and FXT20 Pro for U-bend returns.
Why <1 ms drive response time matters?
U-bend welds rotate around a fixed center. Stepper-motor systems can lose steps on torque transients (a sudden weld pool shift) and produce circumferential weld profile inconsistency. The full closed-loop servo eliminates step-loss risk — the drive corrects within 1 ms of any disturbance. This is why drive control matters on production batches where weld profile consistency is inspected joint by joint.
→ Related
Other systems in the FYID-Feiyide range.
Contact us for a quote
FAQ
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What is the FXT20 Pro-C U-shaped orbital welding machine?
The FXT20 Pro-C is a specialized automated system designed for the high-precision socket welding of heat exchanger U-tubes to straight tubes. Known as a "precision surgeon" for tube bundles, it utilizes pulse TIG welding technology to complete 360° circumferential fillet welds. It is specifically engineered to ensure leak-free operation in high-temperature and high-pressure environments, replacing inconsistent manual welding.
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What pain points does the FXT20 Pro-C solve in heat exchanger manufacturing?
It addresses four critical industry challenges: burn-through of thin-walled tubes, inconsistent penetration in confined spaces, oxidation of the internal weld bead, and the cracking of welds during post-weld tube expansion. By using digital 8-zone programming, it ensures a uniform weld formation that manual welding cannot replicate.
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Can the FXT20 Pro-C weld ultra-thin-walled tubes without burn-through?
Yes. The FXT20 Pro-C features ultra-low current control with arc initiation starting at just 5A. This precision, combined with a Pulse DC TIG control system, allows it to weld tubes with a combined wall thickness of ≤1.6mm perfectly, making it ideal for small-diameter heat exchanger tubes (φ16mm and below).
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What materials are compatible with the FXT20 Pro-C U-tube welder?
The system is optimized for austenitic stainless steel (304, 316L) and duplex stainless steel (2205). Its integrated internal argon gas channel prevents sensitization and oxidation, maintaining the original physical and corrosion-resistant properties of the stainless steel.
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Why is internal argon protection critical for U-tube welding?
During the welding of stainless steel, high temperatures can cause the internal wall to oxidize and turn black. The FXT20 Pro-C integrates an internal argon interface that delivers protective gas inside the tube simultaneously with the external torch. This ensures a silver-white metallurgical appearance on the inner wall, meeting GMP cleanliness standards without the need for pickling.
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Is the FXT20 Pro-C compatible with the "Weld Before Expand" process?
Absolutely. The FXT20 Pro-C is designed specifically for the "weld before expand" sequence required by standards like ASME VIII and GB/T 151. By precisely controlling heat input, it creates high-strength welds that do not crack during the subsequent tube expansion process, eliminating crevice corrosion risks.
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How much space is required between tubes for the FXT20 Pro-C welding head?
The welding head features a compact horseshoe-shaped structure that requires a minimum tube center spacing of 38.1mm. This allows it to access and weld compact tube bundles where manual welding is impossible due to dense tube arrangements.
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Is the FXT20 Pro-C portable for on-site heat exchanger installation?
Yes. The welding head is extremely lightweight at only 3kg, and the power source weighs 22kg. It is designed for portability, allowing operators to move between workstations or perform on-site repairs easily with its standard 8-meter flexible cable.
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How does the FXT20 Pro-C ensure consistency across 360° of welding?
It uses an 8-zone independent programming system and a full closed-loop servo control system. This allows the machine to automatically adjust current and rotation speed at different positions (such as 6 o'clock vs. 12 o'clock) to compensate for gravity effects, ensuring uniform weld beads throughout the entire circumference.
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What technical support does Feiyide (FYID) offer for overseas customers?
We provide 7×18 hours online video support in English and Chinese, a 12-month warranty, and lifetime technical assistance. Our service includes remote diagnosis and PQR (Procedure Qualification Record) support to help customers optimize their welding parameters for specific materials and wall thicknesses.