• FYID U12 automated U-bend tube orbital welding machine for AI data center liquid cooling and heat exchangers.
  • FYID U16 automated U-bend tube orbital welding machine for AI data center liquid cooling and heat exchangers.
  • FYID U12-U25 automated U-bend tube orbital welding machine for AI data center liquid cooling and heat exchangers.
  • U-shaped tube bends and circumferential joints in a heat-exchanger tube bundle.
  • Smooth internal weld bead on a stainless steel U-bend pipe joint processed by FYID orbital system.
  • Smooth internal weld bead on a stainless steel U-bend pipe joint processed by FYID orbital system.
1 6

FYID-Feiyide

FYID FXT20 Pro-U U-Bend Orbital TIG Welder | U12/U16/U21/U25

FYID FXT20 Pro-U U-Bend Orbital TIG Welder | U12/U16/U21/U25

$8,360.00
$8,360.00
Sale Sold out
Shipping calculated at checkout.
Power source
Weld head
View full details
Home / Systems / FXT20 Pro U-Bend Welder
FXT20 Pro U-bend orbital welder with U16 head
U-Bend tube socket welder · φ12.7–25 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 / U21 / U25) cover the U-tube heat exchanger and AI data center cooling tube range.

Choose head
U12 φ12.7 mm
U16 φ12.7–16 mm
U21 φ16–21 mm
U25 φ20–25 mm
Request a quote View full specs
Delivery confirmed by configuration, production schedule, and logistics
Use cases · U-tube heat exchangers · AI data center direct-to-chip cooling · double-tube pharma HX
Certifications · CE · ISO 9001
Warranty · 12 months whole-machine
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
φ12.7 mm · ≤1.6 mm combined wall

4 kg · Required clearance radius ≥24.5 mm · Minimum U-tube straight length ≥36 mm. Densely-packed U-tube bundles.

U16
φ12.7–16 mm · ≤1.6 mm combined wall

4 kg · Required clearance radius ≥32 mm · Minimum U-tube straight length ≥44 mm. Standard refrigeration and HX U-tube.

U21
φ16–21 mm · ≤1.6 mm combined wall

4 kg · Required clearance radius ≥36 mm · Minimum U-tube straight length ≥44 mm. Medium-bore U-tube bundles.

U25
φ20–25 mm · ≤1.6 mm combined wall

4 kg · Required clearance radius ≥40 mm · Minimum U-tube straight length ≥48 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 @ 125 A

All four U-series heads (U12 / U16 / U21 / 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 clearance radius or U-tube straight length 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.
Required clearance radius — U12
U12: 24.5 mm (clearance radius)
Required clearance radius — U16
U16: 32 mm (clearance radius)
Required clearance radius — U21
U21: 36 mm (clearance radius)
Required clearance radius — U25
U25: 40 mm (clearance radius)
Minimum center-to-center distance
U12: ≥38 mm / U16: ≥38 mm / U21: ≥54 mm / U25: ≥60 mm
Minimum U-tube straight length
U12: ≥36 mm / U16,U21: ≥44 mm / U25: ≥48 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 36 (U12) / 44 (U16,U21) / 48 (U25) 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% · 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
φ12.7–25 mm across U12 / U16 / U21 / 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
6 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/U21/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, U21, 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/U21/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.

Closed-chamber

FXT20 + C-series

Straight tube-to-tube closed-chamber welds. φ6.35–168 mm. Semiconductor UHP, biopharma WFI, sanitary food.

Tube-to-tubesheet

PT40 / PT80

Tube end seal welds to the tubesheet face for boiler / heat exchanger fabrication. φ10–38 mm tube range.

Benchtop micro

M12 Benchtop Micro

Integrated bench-top orbital welder for φ3–12 mm tubing in lab and semiconductor cleanroom contexts.

首页 / 系统 / FXT20 Pro U形弯管焊机
FXT20 Pro U形弯管轨道焊机配U16焊头
U形弯管插座焊机 · φ12.7–25 mm

FXT20 Pro U形弯管轨道焊机。

用于管内管U形弯管接头的脉冲TIG插座焊机。四款U系列焊头（U12 / U16 / U21 / U25）覆盖U形管换热器和AI数据中心冷却管的尺寸范围。

选择焊头
U12 φ12.7 mm
U16 φ12.7–16 mm
U21 φ16–21 mm
U25 φ20–25 mm
询价 查看完整规格
交货期 根据配置、生产计划和物流确认
应用场景 · U形管换热器 · AI数据中心直冷芯片液冷 · 制药双管换热器
认证 · CE · ISO 9001
质保 · 整机12个月
01 / 产品功能

专为单一接头几何形状设计的轨道焊机：U形弯管插座接头。

FYID-Feiyide FXT20 Pro + U系列是一款自动化轨道GTAW（TIG）焊接系统，专为U形弯管与直管之间的圆周角焊缝设计——即换热器U形管束、AI数据中心液冷模块和制药双管换热器中的"管内管"插座接头几何形状。

这不是改装用于U形弯管接头的通用轨道焊机。FXT20 Pro + U系列从零开始针对该接头几何形状特有的三种失效模式进行设计：旋转过程中内管表面的弧长不稳定、插座处薄合并壁厚的烧穿，以及仰焊道次中316L不锈钢内壁氩气保护不足。

5 A起弧电流和全闭环伺服旋转在批量生产的每个接头上实现一致的热输入和弧长，逐焊参数记录支持机架级液冷系统调试的质量检验可追溯性。

双通道集成氩气保护——同时保护外部熔池和内管——在316L不锈钢上产生银白色无氧化焊缝内壁，防止氧化铁颗粒进入冷却回路并到达GPU冷板微通道。

02 / 可用焊头

四款U系列焊头，覆盖φ12至φ25 mm管道。

U12
φ12.7 mm · 合并壁厚≤1.6 mm

4 kg · 所需净空半径≥24.5 mm · U形管最小直段长度≥36 mm。适用于高密度U形管束。

U16
φ12.7–16 mm · 合并壁厚≤1.6 mm

4 kg · 所需净空半径≥32 mm · U形管最小直段长度≥44 mm。标准制冷及换热器U形管。

U21
φ16–21 mm · 合并壁厚≤1.6 mm

4 kg · 所需净空半径≥36 mm · U形管最小直段长度≥44 mm。中径U形管束。

U25
φ20–25 mm · 合并壁厚≤1.6 mm

4 kg · 所需净空半径≥40 mm · U形管最小直段长度≥48 mm。大型U形管换热器，制药双管。

+ FXT20 Pro电源
220 V单相 · 4.5 kVA · 直流5–200 A · 125 A时100%暂载率

四款U系列焊头（U12 / U16 / U21 / U25）均可在同一台FXT20 Pro上运行。工业PLC + 10英寸触摸屏，8区×8级参数控制，200组程序，全闭环伺服旋转响应时间<1 ms。双通道集成氩气保护（外部熔池+内管同步）。直管对管轨道焊接请参见FXT20 + C系列封闭腔室平台。

03 / U形管束布局要求

U系列焊头必须能够接触到的管束几何形状。

订购前，请对照以下接触限制条件确认管束图纸。U系列焊头必须能在每个管内管插座接头处实体定位并旋转。若管间距或直管延伸不满足所选焊头的最低要求，焊头将无法到达接头位置。

最大管道外径
φ25 mm（U25焊头）——支持外径不超过此值的U形管和AI液冷模块。超过φ25 mm请联系我们进行定制焊头评估。
合并壁厚
典型值≤1.6 mm——插座截面处外管壁厚与内管壁厚之和。这是电弧在单道自熔焊接中必须熔透的合并厚度。
所需净空半径——U12
U12: 24.5 mm (clearance radius)
所需净空半径——U16
U16: 32 mm (clearance radius)
所需净空半径——U21
U21: 36 mm (clearance radius)
所需净空半径——U25
U25: 40 mm (clearance radius)
最小中心距
U12: ≥38 mm / U16: ≥38 mm / U21: ≥54 mm / U25: ≥60 mm
U形管最小直段长度
U形弯管外侧直管段U12: ≥36 mm / U16,U21: ≥44 mm / U25: ≥48 mm，从插座接头面量至弯管切点起始处。焊头夹持和电弧旋转间隙所需。
U形弯管最小弯曲半径
从管束制造商图纸确认。焊头从直管侧接近；弯曲半径过小导致可用直管延伸低于36 (U12) / 44 (U16,U21) / 48 (U25) mm时，无特殊焊头配置无法焊接——订购前请发送图纸进行评估。
管子排列方式
三角形或正方形间距均支持。最小间距限制不受排列方式影响。三角形间距按相邻管子中心之间的对角线测量。

报价前请提供：换热器或液冷模块管束图纸（或尺寸表），注明管道外径、壁厚、管间距（中心距）和U形弯管外侧直管延伸长度。我们在订单确认前核实焊头适配性并编写初始参数程序。

04 / 技术规格

采购规格表。

焊接工艺
自熔GTAW（TIG）——直流及脉冲模式，无填充焊丝
输出电流
直流5 – 200 A
最小起弧电流
5 A（防止合并壁厚≤1.6 mm时烧穿）
输入电压
220 V AC ±10% · single-phase
功耗
4.5 kVA
焊接区段
每道环缝8个独立区段
存储程序
200组
旋转驱动
高分辨率编码器全闭环伺服电机，响应时间<1 ms（无步进电机的失步风险）
焊枪冷却
循环水冷，流量≥400 ml/min，压力0.3 MPa
管道外径范围
U12 / U16 / U21 / U25合计φ12.7–25 mm
合并壁厚
典型值≤1.6 mm（插座处外管壁厚+内管壁厚）
适用材料
奥氏体不锈钢304 / 316L · 双相2205 · 钛合金 · CuNi（需调整参数）
氩气保护
双通道集成——外部熔池+内管同步保护
线缆长度
标配6 m柔性线缆；可加长
认证
CE · ISO 9001
交货期
根据配置、生产计划和物流确认
质保
整机12个月；耗材除外
05 / 采购问答

采购商在下单前常问的问题。

FXT20 Pro与FXT20封闭腔室是同一款产品吗？

不是。它们共用同一类紧凑型电源（220V单相4.5 kVA 5–200A），但是焊头几何形状不同的两款产品。FXT20 + C系列焊头是用于直管对管对接焊缝的封闭腔室焊头。FXT20 Pro + U12/U16/U21/U25焊头是用于管内管角焊缝的U形弯管插座焊头。电源型号为FXT20 Pro；焊头系列称为U系列（U12、U16、U21、U25）。C系列和U系列焊头不能互换。

本产品与用于AI液冷的FXT20封闭腔室有何区别？

区别在于接头几何形状。AI数据中心液冷有两类接头：直管对管集管焊缝（使用FXT20 + C系列封闭腔室）和回流弯管与直管连接的U形弯管插座接头（使用FXT20 Pro + U12/U16/U21/U25）。是否两者都需要取决于冷板、集管和回流弯管的设计。

能否焊接CuNi 90/10冷凝器管？

CuNi合金列为"需调整参数后兼容"。标准预设程序默认不涵盖CuNi；我们应要求开发定制工艺。对于大批量CuNi生产，请联系我们的工艺工程团队获取工艺资质认证支持。

本产品与PT40管子-管板焊机有何区别？

接头类型不同。PT40将管端焊接至管板面（直管在换热器管板处终止的接头）。FXT20 Pro + U系列焊接U形管回流插座——U形管与直管段重新连接的位置。典型换热器制造通常两者都需要——PT40用于管板密封焊接，FXT20 Pro用于U形弯管回流焊接。

驱动响应时间<1 ms为何重要？

U形弯管焊接围绕固定中心旋转。步进电机系统在力矩瞬变（熔池突然移位）时可能失步，导致环周焊缝轮廓不一致。全闭环伺服消除了失步风险——驱动在任何扰动发生后1 ms内完成修正。这就是在逐接头检验焊缝轮廓一致性的批量生产中，驱动控制至关重要的原因。

→ 相关产品

FYID-Feiyide产品系列中的其他系统。

封闭腔室

FXT20 + C系列

直管对管封闭腔室焊接。φ6.35–168 mm。半导体UHP、生物制药WFI、卫生食品。

管子-管板

PT40 / PT80

用于锅炉/换热器制造的管端密封焊接至管板面。管道外径范围φ10–38 mm。

台式微型

M12台式微型焊机

集成式台式轨道焊机，适用于实验室和半导体洁净室环境中φ3–12 mm管道。

Contact us for a quote

Frequently asked questions

  • What is the FXT-U U-tube orbital welding system?

    The FXT-U combines an FXT20 Pro power source with a selected U12, U16, U21 or U25 clamp for socket or butt welding of straight tubes to U-bends. The guide covers heat exchangers, refrigeration equipment and surface air coolers.

  • What joining tasks does the FXT-U address in heat exchanger manufacturing?

    The guide specifies enclosed welding clamps, controlled welding parameters and internal argon purging for easily oxidized tubes. Tube preparation, fit-up and procedure qualification remain necessary for each workpiece.

  • What wall-thickness limits apply to FXT-U socket and butt joints?

    The selection table allows a maximum 1.6 mm combined wall thickness for socket joints and a maximum 1.6 mm tube wall for butt joints. Confirm the tube OD and joint drawing before selecting a clamp.

  • Which tube materials does the FXT-U configuration guide cover?

    The configuration guide covers thin-wall carbon steel and stainless steel tubes. Confirm the exact grade and welding procedure for the project.

  • Why is internal argon protection critical for U-tube welding?

    The guide requires argon shielding and internal argon purging when welding easily oxidized materials such as stainless steel, to help prevent oxidation inside the tube.

  • Does the FXT-U support welding before tube expansion?

    Yes. The configuration guide specifies welding first and expanding afterwards. Confirm the joint and inspection procedure for the actual tube bundle.

  • What clearance radius does each FXT-U clamp require around the weld tube?

    The guide does not state a single minimum tube center spacing. It requires a clear radius of 24.5 mm for U12, 32 mm for U16, 36 mm for U21 or 40 mm for U25 around the welded tube center. Send the end-plate hole layout for review.

  • What are the FXT-U power-source and clamp weights and standard cable length?

    The FXT20 Pro power source weighs 20 kg. Each U12, U16, U21 and U25 clamp weighs approximately 4 kg excluding cable, and the standard clamp cable is 6 m. Confirm site access and services before use.

  • How does the FXT-U control and store welding parameters?

    The FXT20 Pro uses PLC control and an interval/zone parameter function, with 200 stored program sets. Weld quality still depends on tube preparation, argon shielding and the qualified procedure.

  • What technical support does Feiyide (FYID) offer for overseas customers?

    The guide specifies 6×18-hour online/video consultation in Chinese and English, a standard 12-month complete-unit warranty excluding wear parts, lifetime technical support and remote diagnosis for overseas customers. Confirm service terms in the contract.