Seam Drift and Incomplete Fusion in Welded Tube
A weld that drifts off-center or fails to fuse completely is the fastest route to scrap and field failures. For small-diameter φ10-26mm tube, keeping the seam exactly on the squeeze-roll center is what separates a strong, round tube from a weak, oval one.
Why the Weld Seam Drifts Off-Center
Without a positive guide, the strip edges wander as they approach the weld point, so the squeeze rolls meet the seam off-center and fusion is uneven. Insufficient squeeze pressure leaves voids, while excess pressure creates flash and weakens the weld zone.
The ZY20 Weld Seam Tube Mill Solution
A dedicated weld seam guide holds the seam position through the weld zone, keeping the edges centered for the squeeze rolls.
Squeeze welding then forges the molten edges together under controlled pressure, completing full fusion without voids or excess flash.
Automatic outside-burr removal cleans the bead immediately after welding, so the tube enters sizing with a smooth, consistent weld.
Technical Specifications of the ZY20 Tube Mill
| Parameter | Specification |
|---|
| Tube outside diameter | φ10–26 mm |
| Wall thickness | 0.4–1.5 mm |
| Rated production speed | up to 90 m/min |
| Raw material | HR / CR low-carbon steel, galvanized steel |
| HF welder power | 100 kW solid-state |
| Forming stands | 5 rough + 3 finish |
| Sizing stands | 6 horizontal + 6 vertical |
| Leveling rolls | 7-roll precision leveler |
| Cut length / precision | 4–8 m, ±3 mm |
| Coolant flow | ≥10 t/h spray + overflow pool |
| Roll shaft material | 42CrMo quenched & tempered + HF hardened |
Complete Continuous Production Process
Every ZY20 runs one continuous flow from coil to finished cut tube. An uncoiler feeds strip through a 7-roll precision leveler that removes coil-set, then double-radius forming shapes it in 5 rough and 3 finish stands without edge wave. A 100 kW solid-state HF welder fuses the seam under squeeze pressure with a dedicated seam guide, and an automatic outside-burr unit clears the bead immediately. ≥10 t/h spray plus overflow-pool cooling locks the shape, the 6-horizontal + 6-vertical sizing train sets the diameter, and a 4-roll Turk head straightens the tube before the microcomputer flying saw cuts 4–8m lengths to ±3mm. Overload-protected stands and 42CrMo hardened shafts keep the whole line stable over long runs.
Where the ZY20 Weld Seam Tube Mill Is Applied
Precision, furniture, structural and galvanized tube where a strong, centered weld is the primary quality requirement.
How to Select a Weld Seam Tube Mill
Check the seam guidance and squeeze control — the ZY20 uses a dedicated seam guide and adjustable squeeze pressure. Match OD and wall to φ10-26mm / 0.4-1.5mm and confirm post-weld burr removal.
Installation, Support and After-Sales
The ZY20 ships as a turnkey package with layout and foundation drawings so you can prepare the site before delivery. Engineer-led on-site installation and commissioning bring the line to rated output, with operator training to hand over a running mill. A one-year warranty with spare-parts support protects the investment, and because the line accepts HR, CR and galvanized coil, you can adapt to changing material costs and market demand without re-tooling.
Frequently Asked Questions About the ZY20 Weld Seam Tube Mill
How is the seam kept centered?
A dedicated seam guide holds the edges on the squeeze-roll center through welding.
What is squeeze welding?
Squeeze rolls forge the molten edges together under pressure for full fusion.
How is the bead removed?
An automatic outside-burr unit clears the weld bead before sizing.
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