A purpose-built geometry for tube-to-tubesheet welds - clamps to the tubesheet, programs per quadrant for thermal asymmetry, indexes itself to the next tube automatically. PT40 and PT80 are the heads FYID-Feiyide built so heat exchanger fabricators can control repeatability across hundreds or thousands of tube-to-tubesheet joints.
A shell-and-tube heat exchanger has hundreds to thousands of tube-to-tubesheet joints, and each one has built-in thermal asymmetry: one side of the tube sinks heat into the bulk of the tubesheet, the other side has the next tube hole 5 mm away with much less material to absorb heat. A program that runs the same parameters around the full rotation under-penetrates one quadrant and over-penetrates the next.
The PT-series was engineered for this. The head clamps to the tubesheet and programs peak current, base current, pulse frequency, and travel speed independently per quadrant. The thermal sink on each quadrant gets the parameters it needs. The result is a more controlled process for repetitive tube-to-tubesheet welding, with acceptance confirmed by the customer WPS and inspection plan.
Two heads with different OD ranges and different power source pairings: PT40 covers OD 12-38 mm tube OD on the FXT20 power source (same compact 220V single-phase 5-200A digital pulse source as C-series). PT80 covers OD 38-80 mm tube OD on the FXT40 Pro power source (three-phase 380V, 5-200A - the same industrial power source that drives K-series). Both produce a per-joint data log indexed by tube-row coordinate so an ASME Section VIII auditor can ask for joint (row 12, column 8) and retrieve the matching weld record.
Tube-to-tubesheet for boiler economizers, heat exchangers, nuclear steam generators. 0 deg / 7 deg dual-angle slide base. 3 kg head, <30s elastic-collet clamping. Carbon, stainless 304/316L/904L/2205, titanium, Alloy 600/690.
Larger tube-to-tubesheet joints on shell-and-tube condensers and process heat exchangers. Runs on FXT40 Pro industrial power source (not FXT20). Special configurations on request.
Same compact digital power source that drives C-series. PT-specific programs in the library are indexed by material x OD x wall x quadrant. (K-series open-frame uses the separate industrial FXT40 Pro.)
PT40 uses the FXT20 digital power source - the same compact 220V single-phase 5-200A source as C-series closed-chamber. PT80 uses the FXT40 Pro (three-phase 380V, 5-200A) due to the higher current required for OD 38-80 mm tube. Both heads share the per-quadrant programmable parameter architecture and the same operator workflow; the operator picks a program for "316L 22 mm OD 2 mm wall PT40 standard tubesheet" and runs an expert's parameter decisions on the first weld.
For shell-and-tube fabrication shops adding orbital, the FXT20 + PT40 + PT80 combination is a single equipment investment that covers the typical 16 - 8 mm OD tube range with per-joint data records; delivery is confirmed by configuration, production schedule, and logistics. (K-series open-frame work uses the separate industrial FXT40 Pro power source.)
Compact digital pulse-controlled TIG power source. Drives FYID-Feiyide C-series closed-chamber and PT-series tube-to-tubesheet heads.
PT40 / PT80 for 16 - 8 mm OD tube-to-tubesheet on 316L, duplex, cupronickel, titanium. Per-quadrant parameter control supports repeatability across thousands of joints.
Read the methodologyPT-series program library covers CuNi 90/10, brass, and titanium for refrigeration condensers, dairy evaporators, and HVAC chillers - common materials that benefit from per-quadrant heat control.
All industriesThe FYID-Feiyide PT-series is a family of two tube-to-tubesheet orbital TIG weld heads (PT40 and PT80) covering tube OD from 16 mm to 38 mm. The heads share the FXT20 compact digital power source with the C-series closed-chamber family. (K-series open-frame work uses the separate FXT40 Pro industrial power source.) The PT family is purpose-built for shell-and-tube heat exchanger fabrication - clamps to the tubesheet, programs parameters per quadrant for thermal asymmetry, indexes to the next tube automatically.
Acceptance depends on material, tube-sheet geometry, fit-up, cleanliness, WPS, operator setup, and inspection plan. PT-series heads support repeatability with per-quadrant parameter control, AVC, and automatic positioning between adjacent tubes.
The thermal sink around each tube is asymmetric. The side facing the tubesheet bulk dissipates heat differently from the side facing the next tube hole 5 mm away. A single-parameter program either under-penetrates one quadrant or burns through another. The PT-series programs peak / base / pulse frequency / travel speed independently per quadrant.
Yes. The PT-series program library covers 316L, 304L, duplex 2205 and 2507, cupronickel 90/10, and titanium with validated parameter entries indexed by material x OD x wall. Switching materials means changing the program - the head and power source stay the same.
PT-series data logs are indexed by tube-row coordinate (row R, column C) with voltage, current, gas flow, pulse profile, operator ID, and program ID. ASME Sec VIII inspectors frequently ask for traceability on a specific joint location - the FYID-Feiyide log is structured to return the matching weld record. The audit answer becomes a database query, not a paperwork hunt.
Engineering review timing is confirmed by project and timezone. Include tube OD, wall, material, tube count, and target acceptance criteria.
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