Is In-House Strip Cutting Worth It? CNC Flame Strip Machine Cost, Output and Workflow Q&A

Is it cheaper to cut steel strips in-house with a CNC flame strip machine than buying ready-made strips?

For most fabricators consuming more than roughly 10-15 tonnes of strips per month, in-house cutting wins on total cost. Service centers typically charge a slitting premium of USD 40-90 per tonne plus delivery lead times of 1-3 weeks, and they only stock standard widths. With the YOMI YM-CS flame strips cutting machine (3150 x 8000 mm working area), you buy full plates at base price and cut exactly the widths your H-beam assembly line needs that week, including odd widths for webs. A typical payback calculation: a shop cutting 500 tonnes of strips per year saves USD 20,000-45,000 in slitting fees and logistics, while also cutting scrap because plates are nested to order. Under those volumes the machine pays for itself in 18-30 months. Below roughly 100 tonnes per year, or if your widths are perfectly standard and deliveries are reliable, buying slit strip can still make sense - the machine then earns its keep by handling urgent jobs and non-standard widths.

How many strips can a 9-torch CNC flame strip cutting machine produce per hour?

Because N strips need only N+1 torches, a machine fitted with a 9-torch longitudinal group cuts 8 strips in a single pass at the same travel time a single-torch gantry needs for one strip. On 12-16 mm mild steel at a cutting speed of 350-450 mm/min, one 8 m longitudinal pass takes about 18-22 minutes including piercing and the transverse end-trim pass. That means a full 3.15 x 8 m plate can be divided into 8 finished strips in roughly 30-35 minutes of cycle time - about 15-20 tonnes of strip per shift on one machine with one operator, allowing for plate loading and unloading. On thinner 8-10 mm plate the output rises further because speed can reach 500-700 mm/min. The real bottleneck is usually plate handling: a vacuum lifter or magnetic crane that turns a plate in under 5 minutes keeps the machine cutting instead of waiting.

How much material is lost to kerf when cutting strips, and how do you minimize waste?

Oxy-fuel kerf width is typically 1.5-3 mm depending on nozzle size. In multi-torch strip cutting every internal cut is shared by two neighbouring strips, so a plate divided into 8 strips loses only 7 cuts x ~2.5 mm = about 17.5 mm of total width - roughly 0.2-0.6% of plate width, far less than the 3-5% edge trim service centers deduct. To minimize waste further: nest transverse cross-cuts so offcuts become usable blank lengths rather than scrap; plan strip widths to a common adder (for example all widths divisible by 5 mm) so leftover edge bands are reusable as stiffener or rib stock; and use StartCAM nesting to combine strip jobs from the same plate thickness. With good planning, plate utilization on strip work regularly exceeds 92-94%.

Do flame-cut strips need grinding or edge preparation before H-beam assembly and SAW welding?

For standard fillet and submerged-arc welding on an H-beam assembly machine, a clean flame-cut edge can be welded directly - no grinding needed. What matters is removing three things: heavy dross beads on the bottom edge (chip or knock off with a hammer bar), rust and mill scale within 20 mm of the cut line (the main cause of SAW porosity), and any oil or moisture from storage. EN 1090-2 and AWS D1.1 both accept machine flame-cut edges for SAW provided the cut face is free of deep notches - a roughness within ISO 9013 range 2-3 is a common internal spec. If strips carry a bevel for full-penetration joints, fit bevel torches so the K/V/X edge is produced in the same pass; the bevel face then only needs scale removal. Grinding down to bare metal is only required on cut edges with visible notches or when a brittle paint system will be applied within tight thickness limits.

Can the machine deliver strips already cut to finished length, or is a separate saw needed?

The YOMI YM-CS carries a rear group of transverse (cross-cut) torches in addition to the longitudinal strip torches, so transverse joints are cut in the same or a following traverse. That means strips leave the table as finished-length rectangular blanks - for example, an 8 m plate can be divided into 300 mm wide strips and then cross-cut into 1.5 m or 2 m web blanks in the same program, with the front CNC torches handling any end notching or shaped cuts. For most H-beam shops this eliminates a separate strip sawing station and its handling time. One caveat: very thick plate (above ~60 mm) cross-cutting takes longer per cut, and if your downstream process needs precision mitre or bevel ends on strip blanks, those are better done on a dedicated saw or the bevel torch option. For straight, square-ended blanks, the built-in cross-cut capability is sufficient and saves a whole material-handling step.

What automatic features does the YOMI flame strip cutting machine include?

Key automation on the YM-CS includes: (1) F2300B CNC control with menu-driven operation and DXF import through StartCAM nesting software, so strip layouts are generated automatically rather than taught point by point; (2) automatic torch height control keeping the nozzle-to-plate distance constant over plate undulation, which is what holds width and edge squareness along the full 8 m pass; (3) programmable pierce sequencing - torches pierce in a staggered order with individual timers so nine simultaneous piercings do not distort the plate or starve the gas manifold; (4) Panasonic servo drives on X and Y (750 W with reducers) for consistent speed across the gantry; and (5) a gas collector/manifold system that feeds all torches from one regulated station with individual torch valves. Options include plasma cutting torches on the same frame for thinner work and automatic ignition. These features mean one operator supervises the whole process instead of hand-adjusting each torch.

How many operators does a CNC strip cutting machine need and what training is required?

One operator plus a crane driver is the normal staffing: the operator imports the nest, positions the plate, sets gas pressures from the recipe sheet, starts the program and unloads strips; the crane driver handles plate loading with a magnetic or vacuum lifter. For training, an operator with basic computer skills learns day-to-day operation - nesting, torch setup, pressure settings, program start - in 2-3 days on site. Multi-torch specific skills (equal preheat checks, staggered pierce timing, reading dross to fine-tune speed) take another 1-2 weeks of production to consolidate. YOMI supplies commissioning and training with the machine (typically 3-5 days installation and training), a Chinese/English control interface, and remote video support afterwards. No dedicated programmer is needed - StartCAM generates cutting paths from DXF files automatically.

How much gas and electricity does a multi-torch flame cutting machine consume per shift?

Electrical consumption is modest: the servo drives, THC units and control system draw roughly 3-5 kW on average, so an 8-hour shift uses around 25-40 kWh - far less than a plasma system of similar capacity. Gas is the main running cost and scales with the number of torches actually lit. Per cutting torch, oxy-fuel consumption is approximately 1.5-3 m3/hour of oxygen and 0.4-0.8 kg/hour of fuel gas (propane) while cutting; a 9-torch longitudinal pass running 4 hours per shift therefore consumes roughly 30-50 m3 of oxygen and 10-15 kg of propane per shift, plus preheat standing time. Practical tips: use a cylinder manifold or bulk oxygen supply instead of single cylinders to avoid changeover downtime; keep 2-4 spare torch stations wired so you can run fewer torches on partial plates without idling gas; and check oxygen purity above 99.5% - low purity quietly inflates both gas use and nozzle wear.

Technical Specifications of CNC Flame Strips Cutting Machine

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Applications

The CNC Flame Strips Cutting Machine is widely applied in steel structure prefabricated buildings, bridge and infrastructure construction, shipbuilding and marine engineering, heavy machinery manufacturing, power plant and industrial facilities, and offshore wind power structures.

Learn more about the CNC Flame Strips Cutting Machine:
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For more information about CNC Flame Strips Cutting Machine and other steel structure intelligent equipment, contact YOMI CNC Cutting & Welding Machinery. Our team of experts is ready to help you find the best solution for your manufacturing needs.