Circumferential Seam and Flange Welders for Duct, Tanks and Cylinders
Double-torch girth welder, vertical ring-seam welder for stainless, and a large-duct flange welder up to 3500 mm
Overview
What it does
These machines weld the round seams: cylinder to cylinder, flange to duct, and end caps. The work turns under a fixed torch, so every point of the seam sees the same speed and torch angle.
The double-torch welder runs two independently controlled torches at once, with arc-voltage height tracking and external gas shielding. The vertical ring-seam welder holds stainless cylinders and cones upright on a turntable and reaches inner, outer and corner seams from a multi-axis cross arm in one clamping, with TIG and filler wire.
For large air and exhaust ducts, the flange welder turns duct sections on roller beds and welds flanges and duct-to-duct joints on diameters from 300 to 2000 mm, up to 3500 mm at the limit, and sections up to 4500 mm long.
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Models and specifications
Double-torch circumferential seam welder
| Torches | Two, independently controlled |
| Height control | Arc-voltage tracking of torch height |
| Shielding | External gas shielding |
| Filler | Wire feeder can be added |
| Maximum total power | 20 kW |
| Power supply | 380 V |
| Welding speed | 4 to 8 mm/s |
| Repeat positioning accuracy | ±0.1 mm |
| Drive | AC servo motors with reduction gears |
| Machine weight | 2000 kg |
Vertical ring-seam welder for stainless
| Material | Stainless steel, 0.8 to 4 mm |
| Workpiece size (drawing notation) | D 720 to 1700 mm, B 240 to 900 mm, L 650 to 1250 mm, d 200 mm |
| Seams | Straight and cone cylinders: inner, outer and corner seams |
| Process | TIG with filler wire; 500 A class TIG source |
| Programming | Enter the workpiece dimensions |
| Maximum running speed | 200 mm/s |
| Welding speed | 4 to 8 mm/s |
| Repeatability | ±0.1 mm |
| Power consumption | 15 kW, 380 V / 50 Hz |
| Loading | Manual, single clamping |
| Fit-up before welding | Tack welds about 3 mm long every 50 mm, joint gap 0.5 to 1 mm |
Large round duct flange and seam welder
| Use | Flanges and duct-to-duct joints on large air ducts |
| Diameter | 300 to 2000 mm as standard, 3500 mm at the limit |
| Section length | 1200 to 4500 mm (below 1500 mm the middle roller bed is removed) |
| Carbon steel thickness | 1.0 to 10 mm at diameter 300 to 2000 mm; 2.5 to 10 mm at diameter 1500 to 3500 mm |
| Stainless steel thickness | 1.0 to 10 mm at diameter 300 to 2000 mm; 2 to 10 mm at diameter 1500 to 3500 mm |
| Materials | Galvanized, carbon steel and stainless steel pipe |
| Total rated power | 48 kW |
| Welding speed | 4 to 8 mm/s |
| Repeat positioning accuracy | ±0.1 mm |
| Machine size (L x W x H) | 6900 x 4300 x 3400 mm |
Questions before you quote?
Send photos or drawings of your parts and we come back with the right configuration.
Ask on WhatsAppOptions to discuss
- Double-torch, ring-seam or large-duct configuration
- TIG, MIG/MAG or filler wire
- Roller beds and turntable sized to your work
- Internal gas shielding for stainless
What we need from you to quote
- Material and thickness
- Diameter range and section length
- Seam types: girth, flange to duct, cone, end cap
- Weld quality required
- Site power supply
Related machines in our duct range
- Automatic Stitchwelder SB-ZF1500: horizontal straight seam welder for round duct, 0.8 to 3 mm, diameter 150 to 1500 mm
Supply terms
Who supplies it. Taokron. We handle the inquiry, specification review, quotation, pre-shipment inspection, shipping and after-sales support from Melbourne.
Lead time. Lead time is not published for these machines. It depends on the configuration and is confirmed at quotation.
Warranty. Warranty terms are confirmed at quotation.
Commissioning. Remote support included; on-site installation engineer available on request, quoted per order.
CE. CE marking is confirmed at quotation for each machine.
Price. Each machine is configured to your parts, material and output, so there is no list price. Send your details and we quote that machine.
Price request
Ask for a quotation on this machine
Send the parts you make, the material and thickness, the size range and your output. Ryan Tao replies within 12 hours with a configuration, lead time and price. You can also send photos and drawings on WhatsApp +61 435 074 994.
Quotation for: Circumferential Seam and Flange Welders for Duct, Tanks and Cylinders
Several machines or a complete line? Use the full inquiry form
Frequently asked questions
About this machine
Which machine for which job?
Cylinders, flanges and end caps where two seams can be welded at once: the double-torch welder. Stainless cylinders and cones that need inner and outer seams in one clamping: the vertical ring-seam welder. Large air and exhaust ducts with flanges: the large-duct welder.
How must the parts be prepared?
For the ring-seam welder the setup needs tack welds about 3 mm long every 50 mm and a joint gap of 0.5 to 1 mm. Send drawings of your parts and we confirm the fit-up for each machine.
What diameter can the large-duct welder take?
300 to 2000 mm as standard and up to 3500 mm at the limit, with sections 1200 to 4500 mm long.
What lead time and warranty apply?
Lead time and warranty for this machine are confirmed in the quotation for your configuration.
Is the machine CE marked?
CE marking is confirmed at quotation. Tell us the destination country and we check what documents come with the machine.
Welding and cutting automation
