Tube Mill Machine

Problem Older vacuum-tube welders waste energy, drift with temperature, and respond slowly to speed changes, producing inconsistent weld strength and higher electricity cost per ton of tube. Cause Vacuum-tube oscillators run warm, need warm-up time, and have slow power control, so weld heat lags speed changes; this yields cold welds on acceleration and over-heated seams on deceleration, and the wasted heat raises energy cost. Solution The ZY16 solid-state 100kW HF welder

Problem Producing 0.4-1.0mm thin-wall tube causes two failures on ordinary mills. The weld either burns through because heat input is too high, or it opens up because the strip edges lose alignment before they meet at the weld point, leaving cold welds and split seams. Cause Thin strip has low thermal mass, so excess welding energy instantly melts through the wall. At the same time, thin edges are easily deformed by forming pressure, and any speed or tension fluctuation

Problem Roller shafts that bend under load or wear quickly change the roll gap and profile, so the mill drifts out of tolerance and produces inconsistent tube over time. Cause Ordinary carbon steel shafts deflect under forming load and wear at the bearing and roller seats, gradually altering roll alignment and tube geometry during long runs. Solution The ZY16 roller shafts are made from 42CrMo high-strength alloy steel, heat-treated for hardness and toughness, so they resist

Problem If the final closing of the tube is done imprecisely, the weld edges meet at the wrong angle or gap, producing off-center seams, poor penetration and out-of-round pipe. Cause The last forming passes determine the weld edge geometry, so any overshoot or undershoot there cannot be fixed by the welder and shows up directly as seam defects. Solution The ZY16 finishes forming in three precision stands that set the exact edge gap and approach angle before the weld point.

Problem Trying to form tube in too few passes overworks the strip edges, causing edge strain, thinning at the weld line, springback and inconsistent weld gaps. Cause Heavy forming in a single pass concentrates bending at the edges, so the strip yields unevenly, edges thin and the weld gap varies along the pipe, which the welder cannot correct. Solution The ZY16 spreads the bend across five rough forming stands, gradually closing the strip toward an open-tube profile. Each

Problem Every coil change that stops the line creates a weld seam defect on restart, wastes the tail end of strip, and turns high line speed into low real output. Cause Without strip storage, the forming and welding sections must stop whenever the uncoiler runs out, so the line spends production time ramping up and down instead of running at speed, and each restart leaves a cold or burnt seam. Solution The ZY16 accumulator stores strip at up to 200m/min, faster than the 90m

Problem Small coil capacity forces frequent coil changes, and every change either stops the line or risks a weld defect if the strip runs out mid-tube, dragging down daily output. Cause The uncoiler's physical load rating limits how much strip can be loaded, so low capacity means more stops and more strip-end waste per shift, and each restart is a chance for a weld defect. Solution The ZY16 uncoiler carries up to 1.5-ton coils, and its double-mandrel pneumatic grip plus the

Problem Welding galvanized strip produces zinc vapor that contaminates the weld, leaves black seams and porosity, and coats nearby parts with zinc oxide dust, degrading weld strength and appearance. Cause Zinc melts and vaporizes well below steel's welding temperature, so the zinc coating on the strip edges vaporizes during HF welding and can be trapped in the molten pool, causing porosity and weak seams. Solution The ZY16 keeps weld heat tight and localized with the 100kW

Problem Hot rolled strip carries mill scale and wider thickness variation, which wears rollers, disturbs the weld gap and leaves surface defects that are hard to hide on finished tube. Cause Mill scale is abrasive and increases roll wear, while HR strip thickness can vary more than cold rolled, so the weld edge gap and forming geometry shift along the coil length and cause intermittent weld defects. Solution The ZY16 feeds HR strip through a seven-roller leveler to flatten

Problem When a mill is pushed to high speed, the strip becomes unstable. Coil changes stop the line, tension surges pull the weld seam off-center, and forming rollers heat up and shift, causing scrap and downtime that erase the speed gain. Cause Speed amplifies every upstream variation. Without a buffer store, the line must slow for each coil change; without stable tension, the weld gap oscillates at speed; and without heat management, roller geometry drifts under friction

Problem Small diameter tube makers often struggle to hold roundness and weld straightness when running Φ8-18mm pipe. A tiny cross-section amplifies any roller misalignment into visible ovality and a wandering weld seam, so the finished tube fails dimensional checks even though the mill itself is running normally. Cause The root cause is cumulative forming error. With only 8-18mm outside diameter, a 0.05mm roller offset is a far larger relative deviation than on a 50mm pipe.

High-efficiency tube mill for square and rectangle tubes up to 80x80mm. Features direct forming technology, automatic welding control, and 80m/min line speed. Suitable for carbon and galvanized steel. Customizable roll sets and proven export quality.

Continuous production line for welded steel tubes from hot rolled strip. Features heavy-duty forming, high-frequency ERW welding, precision sizing, and automatic cutting. Suitable for structural, construction, and industrial pipes. Customizable voltage, speed, and automation level.

This high speed tube mill produces round, square, and rectangular welded tubes at up to 90 m/min. Features stable forming, HF welding, and precise sizing for construction and industrial frames. Customizable for tube size, wall thickness, and automation level. Suitable for carbon, galvanized, and low-alloy steel.

Precision ERW tube mill for ASTM-compliant steel pipe production. Features automated forming, high-frequency welding, PLC control, and optional inspection systems. Produces round, square, and rectangular pipes from 21-219mm diameter. Customizable for construction, infrastructure, and export markets.

This industrial tube mill produces round, square, and rectangular pipes with customizable size range. Features high-frequency welding, durable forming stands, and flexible roller change. Suitable for carbon steel, galvanized, and low-alloy steel. Supports optional NDT, straightening, and packing systems for enhanced quality control.

Produces square and rectangular tubes up to 500x500mm with 5-22mm wall thickness. Features automatic welding tracking, arc voltage control, and tungsten needle alarm. Customizable forming section. Backed by a manufacturer with hands-on tube production experience for superior technology and reliability.

Produces square steel pipes 150x150mm to 300x300mm with 3-12mm wall thickness. Features automatic welding tracking, arc voltage control, and quick roll change. Line speed up to 30m/min. Ideal for construction, auto, and industrial applications.

High stability equipment using anhydrous welding for insulating glass spacer bars. Supports custom sizes, Siemens motor, and includes installation & after-sale support. Max coil weight 10 tons.

Manufactures round, square, and rectangular steel pipes from 88.9mm to 219mm OD with wall thickness 2.0-8.0mm. Features 300KW HF welder, 50m/min line speed, and CE certification. Customizable for API, structural, and precision tube applications. Proven in 70+ countries.