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Operating-duty selection for a custom robotic welding cell for tank fabrication starts with the workpiece: shell diameter, length, wall thickness, joint types and the seam list the torch must reach. A cell sized for small brackets is not the same RFQ as a cell that must weld circumferential and longitudinal seams on a tank. Upstream forming or rolling and downstream NDT or hydrotest still have to be named as interfaces. This page does not treat a robot arm or a MIG power source as a drop-in substitute for an integrated cell. Suitability requires a named supplier response, not a shop photograph.
Write tank diameter, length, mass, material, weld process, seam list and whether every required seam must be reached without a manual reposition. Include representative production samples or drawings of the worst-case nozzle cluster. Throughput must be stated with those samples, not as a brochure units-per-hour figure. Work envelope and footprint must match the shop crane path and the rolling mill or fit-up station that feeds the cell.
The manufacturer states whether the torch can reach every required seam on the tank fabrication, whether the positioner rating includes fixture mass and center-of-gravity offset, and which loading and guarding arrangement applies. The reply should include the documents that belong to that configuration. A brochure comparison chart is not a supplier answer.
If the RFQ says tank circumferential seams and the reply is a table-top cell for small parts without a labeled deviation, the comparison table is not aligned. The same applies when a dual-station layout is offered against a single-station brief. Record the deviation before award. Upstream/downstream interfaces that were never named remain open.