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Pressure Vessel Welding — Repeatable Seams on Every Shell

Pressure vessel work is unforgiving: every seam has to be the same, and the paperwork has to say so. Carriage welding gives you a parameter set you can write down, repeat and audit — shell after shell.

Pressure Vessel Welding

Parameter sets you can write down, repeat and audit

Vessel shells combine long longitudinal seams with large circumferential joints, usually in thick plate. Manual welding makes penetration a matter of the individual welder's day. A carriage welding at a recorded speed, swing and dwell makes the seam a process, not a performance — which is what code work and WPS compliance actually need.

  • Longitudinal seams on rolled shell sections — ZG straight-track carriage
  • Circumferential seams on shells and nozzles — CX magnetic crawler or RG flexible track
  • Consistent penetration and bead shape through recorded speed and swing parameters
  • DC 24 V low-voltage machines suitable for inside-shell work
What we recommend: ZG-III-Q1 for longitudinal seams, CX-III-Q1 magnetic crawler for circumferential work on shells from Ø108 mm, RG-III-Q1 flexible track for large shells from Ø1800 mm. All connect to your existing MIG / MAG / FCAW power source.
The difference: The same parameter set repeats on every shell — speed, swing width, dwell — so X-ray rework stops being a lottery. One welder supervises two or three machines while the parameters do the quality control.
Browse All Carriage Series
Automatic welding carriage on vertical vessel shell RG carriage torch unit on a curved shell — real photo
Seam Types We Cover

Which Carriage Welds What in Pressure Vessels

Typical joint / seamRecommended machine
Longitudinal seams on shell sectionsZG-III-Q1 straight-track carriage
Circumferential seams, shells from Ø108 mmCX-III-Q1 magnetic crawler
Large vessel shells from Ø1800 mmRG-III-Q1 flexible-track carriage
Nozzle & saddle fillet weldsJJ fillet carriage
Watch It Work

Automatic Shell Seam Welding — Straight Track

Straight-track carriage welding a long shell seam — real footage
FAQ

Pressure Vessels Welding — Common Questions

We work to WPS documents — can carriage parameters be recorded?
Yes, and that is the core benefit: every parameter is digital and stable — travel speed 0–1100 mm/min (digital display), swing width, swing speed, dwell times, centre offset. Set them once per WPS, note them on the document, and the machine repeats them identically on every seam.
Which machine for a shell that is both long and curved?
Both problems, two machines: the ZG straight-track carriage handles the longitudinal seams on the plate before rolling or on flat sections; the RG flexible-track or CX magnetic crawler handles the circumferential seams after rolling. Many vessel shops own both — they share the same control logic and power units.
Can you weld inside the vessel?
Yes. The carriage and track work in any orientation on magnetically permeable steel, and the machines run on safe DC 24 V. Standard confined-space procedures still apply — the carriage solves the welding-position problem, not the entry permit.

Quoting a Vessel Package?

Send us the shell diameters, plate thicknesses and seam drawings — our engineers will configure the carriage set and quote within 24 hours.

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