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The units that complete a welded pipe line rather than make the pipe: uncoilers and decoilers, strip accumulators, shears and butt welders, run-out tables, cooling and straightening units, and the electrical control systems that tie them together. These are often bought separately when an existing line is extended or upgraded.
A flying saw cuts tube to length while the tube keeps moving. ZF series cold cutting with servo tracing to +/-2 mm, plus the saw disc sizes published with the pipe lines on this site.
The portable chamfering machine hand chamfering machine is used to chamfer the iron tube with a correct and nice angle.
Tube closing machine for pipe end locking on 6-25.4mm tube with 0.5-2.0mm wall: hydraulic forming heads close tube ends without welding or sleeves.
The products produced are: 1.0 mm thick strip steel wrapped 7 mm metal calcium wire 9 mm seamless cored wire for the quality of modified steel in steel.
The rolls are the part of a welded pipe mill that actually shapes the tube.
Auxiliary equipment is everything on the line except the forming and welding section: coil handling in front, cut-off and run-out behind, and the tooling in between. It is usually chosen last, and it is usually what limits output first — a mill cannot cut faster than its saw returns.
Two items deserve to be specified at the same time as the mill rather than after it: the cut-off, which sets the cycle time, and the roll set, which decides which sections you can sell at all. Ordering these later is the usual cause of a line that runs well but cannot be sold into the sections the market asks for.
A flying saw has to accelerate to tube speed, cut, and return before the next length arrives; that return time, not the forming speed, is what caps a short-length order. Ask for the cut-to-cut time at your shortest length, not only the maximum line speed.
The same logic applies to coil handling: a decoiler that needs a crane and fifteen minutes per coil change costs more per shift than a smaller mill running slightly slower. Coil weight and loading method are the numbers to settle first.