FYID Precision Circular Seam TIG Welding Lathe — Pipe, Flange & Tank Girth Welds, Φ20–400 mm

Precision Circular Seam TIG Welding Lathe for Pipe-to-Flange, Pipe-to-Pipe, and Cylindrical Tank Girth Welds — Φ20 mm to Φ400 mm, Up to 200 kg Workpiece

The FYID-Feiyide HFZB50 is a horizontal automatic TIG (GTAW) circumferential seam welding lathe designed for 360° girth weld automation on cylindrical workpieces: pipe-to-flange joints, pipe-to-pipe butt joints, pipe-to-elbow connections, and cylindrical vessel shell seams. The workpiece rotates on a self-centering three-jaw chuck driven by a precision servo motor; the welding torch is stationary, positioned at the top of the joint. This workpiece-rotates / torch-stationary configuration produces consistent arc length, travel speed, and heat input throughout the full circumferential weld — eliminating the positional variation that manual TIG introduces as the welder repositions around the joint.

The system covers workpiece outer diameters from Φ20 mm to Φ400 mm, workpiece length up to 800 mm, and maximum workpiece weight of 200 kg. The 365 mm through-hole in the rotating headstock accommodates pipe extending beyond the chuck face, enabling welding of long pipe spools without workpiece length constraints. The welding power source delivers up to 400 A with full multi-pass program control — root pass, fill pass, and cap pass in a single stored program — covering wall thicknesses from below 3 mm (no groove required) through heavy-wall pipe requiring V-groove or U-groove preparation.

For orbital welding on fixed pipe where workpiece rotation is not possible — in-situ pipeline joints, skid manifolds, or shipboard piping — the FXT40 Pro with K-series open-head clamps rotates the torch around the stationary pipe. The HFZB50 lathe and the FXT40 Pro are complementary systems for different joint access conditions.

HFZB50 System Specifications — Welding Lathe and Control System

Mechanical and workpiece parameters

Welding power source

JJ-KZ01 integrated welding control system

Groove preparation and fit-up requirements

Wall thickness below 3 mm: no groove required. Wall thickness above 3 mm: V-groove required — single bevel angle 30° to 37.5° for standard carbon and stainless steel (U-groove optional for heavy-wall). Double V-groove for pipe-to-pipe joints in heavy-wall configurations. Fit-up gap must be less than 2% of the root face wall thickness. Joint end faces must be machined with a pipe beveling machine — hand grinding does not produce the perpendicularity and surface finish required for automatic TIG with consistent penetration. Weld bead reinforcement height (cap weld): ≤1.6 mm above the pipe surface.

Industry Applications for the HFZB50 Circumferential Seam Welding Lathe

Petrochemical and Industrial Pipeline Fabrication — Pipe-to-Flange and Pipe Spool Girth Welds

Pipe spool fabrication for petrochemical plants, refineries, and industrial piping systems involves large volumes of pipe-to-flange and pipe-to-pipe girth welds in carbon steel and stainless steel, in pipe OD ranges from 2" (Φ50 mm) to 16" (Φ400 mm). In a spool fabrication shop producing 50 to 200 spool assemblies per week, the circumferential seam weld — not the fit-up or pre-weld inspection — is the throughput bottleneck. Manual TIG welding on pipe-to-flange joints requires the welder to continuously reposition around the stationary joint for the root pass, then again for each fill and cap pass, accumulating fatigue and introducing positional variation in the overhead and vertical passes.

The HFZB50 eliminates repositioning entirely: the pipe spool is chucked on the self-centering fixture, the torch is positioned at 12 o'clock, and the full multi-pass weld sequence — root pass parameters in Zone 1, fill pass parameters in Zones 2 and 3, cap pass with OSC weaving in Zone 4 — executes automatically from a single stored program. AVC arc voltage control maintains constant torch standoff throughout the rotation as the weld pool builds up on successive passes. The 200-program storage means the shop can store qualified weld procedures for every recurring pipe-flange specification in their production mix and recall them in one step — no parameter re-entry between jobs.

Compatible materials: carbon steel (A105, A106), stainless steel (304, 316L), alloy steel. Workpiece OD Φ20 mm – Φ400 mm, wall 2 mm and above. Relevant code: ASME B31.3, EN 13480, GB 50235.

Pressure Vessel and Industrial Boiler Shell Seam Welding

Cylindrical pressure vessels — storage tanks, separators, reactors, and air receivers — require circumferential shell seams that join rolled shell courses to each other and to dished heads or flanged nozzles. These seams are subject to ASME Section VIII Div. 1 or PED 2014/68/EU radiographic inspection requirements: on most pressure vessel categories, full or spot radiography of circumferential seams is mandatory, and the weld profile, reinforcement height, and internal geometry must fall within the code limits to pass.

The HFZB50's 200 kg chuck capacity and 800 mm workpiece length accommodate shell courses and nozzle assemblies in the small-to-medium pressure vessel range (vessel OD up to Φ400 mm). The 365 mm through-hole allows shell pipe to extend beyond the chuck face without length restriction. For multi-pass shell seam welding, the JJ-KZ01 control system's 4-zone / 200-program structure stores the complete weld procedure — root pass, hot pass, fill passes, cap pass with OSC — in a single program that reproduces the qualified procedure identically on every shell seam in the production run. Weld parameter records are available via the control system's data export for inclusion in the vessel Manufacturer's Data Report.

Compatible materials: carbon steel, stainless steel, low-alloy steel. Relevant standards: ASME Section VIII Div. 1, EN 13445, GB 150.

HVAC Equipment Manufacturing — Pipe-to-Elbow and Pipe-to-Header Girth Welds

HVAC equipment manufacturers — producing air handling unit coil headers, chiller evaporator shells, condensing unit manifolds, and fan coil unit piping assemblies — require high-volume circumferential girth welds on carbon steel and stainless steel pipe in the Φ20 mm to Φ200 mm range. These are typically thin-wall pipe joints (wall 2 mm – 5 mm) in production volumes of hundreds to thousands of joints per week, where manual TIG welding is the throughput constraint and weld quality consistency determines pressure-test pass rates at end-of-line.

The HFZB50's 0.1 – 4 rpm rotation speed range accommodates both thin-wall small-diameter pipe (faster rotation, lower heat input per unit length) and heavier-wall large-diameter pipe (slower rotation, higher heat input). The self-centering three-jaw chuck handles the range of pipe ODs in an HVAC production mix without fixture changeover for each diameter — chuck adjustment is continuous, not step-indexed. For pipe-to-elbow joints where the elbow geometry prevents chuck clamping on the curved section, the pipe stub is chucked and the elbow is aligned on the free end prior to tack welding and rotation welding. The system's 24/7 continuous duty capability — water-cooled torch at 300 A, 100% duty cycle — sustains the production throughput requirements of HVAC contract manufacturing environments.

Compatible materials: carbon steel, stainless steel, galvanised steel (bare surface only). Workpiece OD Φ20 mm – Φ400 mm.

Chemical Equipment and Custom Fabrication — Tank Nozzle Welds and Specialty Joint Geometry

Chemical process equipment fabricators and custom vessel shops produce a mixed workpiece schedule — reactor nozzles, heat exchanger shell nozzle connections, jacketed vessel inlet fittings, and one-off cylindrical assemblies — where the variety of workpiece diameters and joint configurations makes dedicated fixturing impractical. The HFZB50's self-centering chuck and continuously adjustable rotation speed accommodate this mixed production without retooling between workpieces: the chuck closes onto each new diameter automatically, the torch position is adjusted on the cross-slide, and the stored program for that specification is recalled from the 200-group library.

The ±30° torch oscillation (OSC) with independently adjustable left and right edge dwell times is specifically useful for nozzle welds where the joint geometry transitions between the nozzle pipe OD and the vessel shell wall — a joint that requires more heat input on the thick shell side and less on the thinner nozzle pipe. OSC dwell time allows the arc to pause on the heavier section for additional fusion before continuing across the joint. The AVC arc voltage control compensates for any surface irregularity or weld pool buildup variation around the circumference, maintaining consistent penetration throughout the rotation.

For non-round or non-cylindrical workpieces, or for workpiece OD above Φ400 mm, contact FYID-Feiyide's applications engineering team — custom fixture configurations and extended-range rotary positioner options are available on request.

HFZB50 Circular Seam Welding Lathe — Frequently Asked Questions

What is the difference between the HFZB50 circumferential seam welding lathe and an orbital welding machine like the FXT40 Pro?

The HFZB50 lathe rotates the workpiece past a stationary torch — the pipe, flange, or tank section is chucked on a rotating headstock, and the torch is fixed at the top of the joint. This configuration requires access to both ends of the workpiece and a chuck that can grip the workpiece OD. It is the correct system for shop fabrication of pipe spools, flange assemblies, pressure vessel shells, and tank nozzles where the workpiece can be moved to the machine.

The FXT40 Pro with K-series open-head clamps rotates the torch around a stationary pipe — the welding head clamps onto the fixed pipe in the field, and the torch rotates 360° around the joint. This is the correct system for in-situ welds on installed piping, skid manifolds, or shipboard piping where the workpiece cannot be moved. The two systems are complementary: the lathe for shop fabrication, the orbital head for field or in-position welding.

What workpiece diameters and joint types does the HFZB50 cover?

The self-centering three-jaw chuck accommodates workpiece outer diameters from Φ20 mm to Φ400 mm. Maximum workpiece length is 800 mm; the 365 mm headstock through-hole allows longer pipe to extend beyond the chuck. Maximum workpiece weight is 200 kg. Joint types covered: pipe-to-pipe butt welds (square butt and V-groove), pipe-to-flange welds, pipe-to-elbow welds, and cylindrical shell circumferential seams. The system is not suited to non-round or non-cylindrical workpieces.

Does the HFZB50 support multi-pass welding on heavy-wall pipe with groove preparation?

Yes. The JJ-KZ01 control system divides the weld sequence into up to 4 zones per program, each with independent current (peak and base in pulse mode), wire feed speed, OSC oscillation parameters, and AVC arc voltage tracking. A typical heavy-wall V-groove program uses Zone 1 for the root pass (no wire feed, lower current), Zones 2 and 3 for fill passes (wire feed active, increased current and OSC width), and Zone 4 for the cap pass (widest OSC, reduced travel speed, adjusted dwell times). All zones execute sequentially in a single program run. 200 programs are stored for recall without re-entry.

What groove preparation is required, and can the pipe end be ground rather than machined?

Wall thickness below 3 mm requires no groove — square butt fit-up with gap less than 2% of wall thickness. Wall thickness above 3 mm requires V-groove: single bevel angle 30° – 37.5° for standard carbon and stainless steel; U-groove optional for heavy-wall multi-pass. Double V-groove for pipe-to-pipe heavy-wall joints. End faces must be machined with a pipe beveling machine — hand grinding does not produce the perpendicularity and surface finish uniformity required for automatic TIG with consistent penetration and cap weld profile. FYID-Feiyide's split-frame pipe cutting and beveling machines are designed to prepare these joint faces before lathe welding.

What documentation does the HFZB50 control system produce for quality records?

The JJ-KZ01 control system displays real-time welding current, arc voltage, and travel speed (rotation speed in degrees/min and linear mm/min) during each weld cycle. Stored program parameters — all zone settings, pulse parameters, gas timing, wire feed settings — are exportable via the control system's data interface for inclusion in weld procedure documentation, ASME Section VIII Manufacturer's Data Report, or EN pressure vessel quality records. For applications requiring per-weld printed records, an optional printer interface is available.

What is the lead time for the HFZB50, and is customisation available?

Standard configuration lead time: contract confirmation plus 1–2 days technical review, then 5–10 working days production scheduling, plus 3–5 working days factory test. Domestic delivery 3–5 days; international sea freight 30–45 days, air freight 10–15 days. Custom configurations — extended workpiece length, non-standard chuck range, alternative control PLC brand (Siemens, Omron, Schneider), or custom machine colour — are available with extended lead times. Pre-delivery factory acceptance testing by the customer is standard practice; FYID-Feiyide notifies the customer upon completion for on-site pre-acceptance inspection. On-site installation, commissioning, and operator training (2–3 persons) are included in the standard delivery scope.

For workpiece dimension confirmation, groove design review, or weld procedure support for ASME Section VIII or EN 13445 compliance, contact FYID-Feiyide's applications engineering team with your workpiece drawing and production volume requirements. Custom chuck configurations for workpiece OD above Φ400 mm or weight above 200 kg are available on request.