Use FOS50 when the part can rotate.
Typical fit for shop-floor pipe-to-flange, pipe-to-elbow, cylindrical shell, and repeat circular seam work where the workpiece can be chucked horizontally.
FYID-Feiyide
FYID Precision Circular Seam TIG Welding Lathe — Pipe, Flange & Tank Girth Welds, Φ20–400 mm
FYID Precision Circular Seam TIG Welding Lathe — Pipe, Flange & Tank Girth Welds, Φ20–400 mm
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$18,246.00
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01 / What it is
A horizontal circular seam TIG welding lathe for factory workpieces that rotate.
The FOS50 precision circular seam TIG welding lathe is built for 360 degree automatic girth welds on cylindrical workpieces: pipe-to-flange, pipe-to-pipe butt joints, pipe-to-elbow assemblies, and tank or vessel shell seams.
It is the reverse architecture of an orbital welder. On FXT20 or FXT40 Pro systems, the torch rotates around a fixed pipe. On FOS50, the workpiece is clamped in the powered chuck and rotates while the TIG torch is positioned on the programmable carriage.
That makes FOS50 the right production choice for factory parts that can be loaded into a chuck: flange fabricators, vessel shops, process equipment builders, and repeatable circular seam batches up to 800 mm length and 200 kg workpiece weight.
02 / Selection boundary
FOS50 vs orbital welding systems.
Use orbital welders when the pipe must stay fixed.
For installed piping, field joints, UHP tube runs, or heavy workpieces that cannot rotate, use FXT20 closed-chamber or FXT40 Pro open-head systems.
Many factories use both.
FOS50 handles repeat factory subassemblies. Orbital systems cover fixed-pipe final connections and field installation joints.
03 / Engineering specifications
FOS50 precision circular seam TIG welding lathe — engineering specifications.
Welding process
GTAW (TIG), DC and pulse modes, filler-wire capable
Output current
4-400 A
Duty cycle
60% at 400 A
Input power
380 V +/-10%, three-phase, 50/60 Hz
Power rating
13.2 kW
Workpiece OD
20-400 mm
Max workpiece weight
200 kg
Max workpiece length
800 mm
Spindle through-hole
365 mm
Chuck diameter
600 mm
Rotation speed
0.1-4 rpm, stepless servo control
Torch travel
550 mm vertical travel; 1,300 mm horizontal travel
Arc length control
AVC 7-25 V range, 0-1800 mm/min response
Oscillation
OSC transverse motion, 0-1000 deg/min, +/-0.1 deg accuracy
Torch
JJT400 water-cooled TIG torch, 300 A at 100% duty cycle per FOS50 source data
Wire feeder
1.0 / 1.2 mm wire, 100-1800 mm/min, 20 kg spool
Control system
JJ-KZ01 PLC + CPU hybrid control, 10 inch color touch screen
Stored programs
200 program groups, 4 zones per program
Materials
Carbon steel, 304/316L stainless steel, alloy steel, low-alloy steel, and plated surfaces confirmed by WPS
Certification
CE; other certification requirements confirmed by order
Warranty
12 months whole-machine; consumables excluded
04 / Buyer questions
What to confirm before purchase.
Can it weld pipe-to-flange joints for ASME B16.5 flange production?
Yes. Pipe-to-flange circular seam welding is one of the main FOS50 applications. The 50-400 mm OD range covers common 1/2 inch to 16 inch flange work, and the 365 mm through-hole allows the pipe end to pass through the chuck while the flange faces the torch side.
What wall thickness can it handle?
The platform covers thin-wall autogenous work through thicker-wall groove welds that require V or U bevel preparation and filler wire. Final procedure limits depend on material, wall thickness, joint design, and the customer's WPS/PQR requirements.
Is AVC included?
Yes. The JJ-KZ01 control includes AVC in the 7-25 V range. AVC helps maintain arc length when a rotating workpiece has minor runout or concentricity variation in the chuck.
Is the chuck included?
A 600 mm chuck is standard. Custom adapters for non-standard workpiece geometry can be made when the clamping surface, weld location, and production quantity are confirmed.
05 / Related systems