The Lincoln Electric FlexCut 80 (K4809-1) is Lincoln Electric's workhorse industrial air plasma cutting system, rated at 80 amps at 80% duty cycle and capable of mechanized piercing up to 3/4 in. (19 mm) mild steel. As documented on Lincoln Electric's FlexCut 80 product page, the K4809-1 ships as a power source only — designed to pair with machine torches for CNC plasma tables, pipe cutting systems, and mechanized cutting applications. It is the standard plasma power source supplied with Lincoln Electric's Torchmate CNC plasma cutting tables.
The FlexCut 80's most significant advantage over competing 80 A plasma systems is its patented consumable design, which delivers up to three times longer electrode and nozzle life versus conventional consumables. In production cutting environments where consumable replacement is a significant operating cost, the FlexCut 80's extended consumable life directly reduces cost per cut. Lincoln Electric's independent testing shows the FlexCut 80 produces faster cut speeds and better edge quality (less edge bevel, lower dross) than comparable competitive systems at both 60 A and 80 A settings.
The IP23 enclosure rating makes the FlexCut 80 rugged enough for outdoor job sites and industrial environments with dust, moisture, and vibration. The non-high-frequency arc start system delivers reliable pilot arc initiation without the electromagnetic interference that HF systems can cause in CNC motion controllers, height control systems, and shop electronics — a critical requirement for clean CNC plasma operation. Input power flexibility spans 200–575V, 1-phase or 3-phase, 50/60 Hz, making the FlexCut 80 compatible with virtually any industrial power supply in North America or internationally.
The K4809-1 supports three cutting modes: standard cutting, gouging, and grid-cutting (expanded metal). A wide range of mechanized and handheld torch packages are available separately, giving fabricators the option to configure the FlexCut 80 for dedicated CNC use, handheld use, or both in shops that need both capabilities from a single power source.
| SKU / Model | K4809-1 / FlexCut 80 (Power Source Only) |
| Process | Plasma Cutting, Gouging, Grid-Cutting (PAC) |
| Input Voltage — 3-Phase | 200–208 / 230 / 380 / 460 / 575 V, 3-Ph, 50/60 Hz |
| Input Voltage — 1-Phase | 200–208 V or 230 V, 1-Ph, 50/60 Hz |
| Rated Output (3-Ph) | 60A/140V/100% | 80A/140V/80% |
| Rated Output (1-Ph, 230V) | 60A/140V/100% | 80A/140V/80% |
| Rated Output (1-Ph, 200V) | 60A/140V/100% | 80A/140V/60% |
| Output Range | 25–80 A |
| Arc Start | Non-High-Frequency (blow-back/contact) — CNC-safe |
| Air Pressure Required | 87–109 PSI (6.0–7.5 Bar) |
| Air Flow Rate | 380 SCFH @ 80 PSI (180 SLPM @ 5.5 Bar) |
| Enclosure Rating | IP23 — outdoor and industrial rated |
| Cut Capacity — Mild Steel (Mechanized Pierce) | 3/4 in. (19 mm) |
| Cut Capacity — Mild Steel (Max Edge Start) | 1-1/4 in. (32 mm) |
| Net Weight | 96 lbs (44 kg) |
| Dimensions (H×W×D) | 17.9" × 11.8" × 25.4" (455 × 301 × 645 mm) |
| Warranty | 3 Years — Lincoln Electric factory |
| Condition | New — Lincoln Electric K-prefix (factory-new) |
- FlexCut 80 Plasma Power Source (K4809-1) — power source only
- Input power cord
- Operator's manual
- Note: Machine torch, handheld torch, and consumables are sold separately. Compatible torch packages: LC80M machine torch (K4290-series) and LC80 handheld torch.
Complete your FlexCut 80 system with WeldingMart-stocked Lincoln-compatible accessories:
- Plasma Torches — LC80M machine torches in 25 ft, 50 ft, and 75 ft lead lengths for CNC tables and pipe cutting systems; LC80 handheld torches for manual cutting with the same power source; flexible-neck bodies and extended-reach torch bodies for structural and pipe applications.
- Plasma Consumables — Genuine Lincoln Electric electrodes, nozzles, swirl rings, and shield caps for the FlexCut 80 / LC80 torch system; extended-life consumable packs rated for 3× longer life than standard air plasma consumables; consumable starter kits for new installations (K4291-series).
- Air Treatment — Filters & Dryers — High-flow inline moisture separators and desiccant dryers for 87–109 PSI compressed air supply to the FlexCut 80; coalescing filter kits to remove compressor oil vapor that degrades plasma consumables; high-flow regulators for shops using multiple plasma cutting stations.
The FlexCut 80's 80 A output, non-HF arc start, and IP23 industrial rating make it the standard choice for professional mechanized plasma cutting:
- HVAC ductwork and sheet metal production cutting. On CNC plasma tables, the FlexCut 80 cuts 16-gauge through 1/4 in. galvanized and stainless duct blanks, fittings, and transition shapes at production speeds exceeding 140 ipm on 14-gauge mild steel. The non-HF arc start is compatible with CNC motion controllers and height control systems without RF shielding. For HVAC contractors running a Torchmate or similar table, the K4809-1 is the factory-matched plasma power source.
- Automotive bodywork and custom fab shops. In manual configuration with an LC80 handheld torch, the FlexCut 80 cuts body panels, frame sections, and custom brackets in 18-gauge through 3/8 in. mild steel. Extended consumable life reduces per-cut cost for high-volume body shops; IP23 rating means the machine survives a busy body shop environment without special protection.
- Structural steel fabrication and ironwork. Mechanized piercing to 3/4 in. and edge-start cutting to 1-1/4 in. covers the full range of structural shapes — angle iron, flat bar, tube steel, channel, and plate — in fabrication shops and structural steel erection. For structural beam and pipe cutting, the FlexCut 80 pairs with Lincoln Electric pipe cutting systems and structural cutting carriages.
- Art, architectural metalwork, and custom fabrication. The FlexCut 80's dross-free cut quality at 60–80 A on mild steel and stainless plate produces edge finish suitable for decorative metalwork without extensive secondary grinding. CNC cutting tables running the K4809-1 produce complex artistic and architectural patterns from flat plate at production rates impossible with hand cutting.
- Demolition, scrap processing, and industrial MRO. The IP23 enclosure and non-HF arc start make the FlexCut 80 deployable in industrial demolition environments. Extended consumable life reduces cost-per-cut in scrap processing applications where electrode wear is the primary operating expense. Gouging mode handles weld removal and plate preparation tasks beyond standard plasma cutting.
The FlexCut 80 (K4809-1) achieves mechanized piercing up to 3/4 in. (19 mm) mild steel — the specification relevant for CNC plasma table applications where the cut starts with a plunge pierce. Edge-start maximum capacity is 1-1/4 in. (32 mm) mild steel. Production cut capacity (the thickness at which the machine maintains rated cut speed and edge quality) is 3/4 in. at 80 A. Stainless steel and aluminum capacity is similar to mild steel. According to Lincoln Electric's FlexCut 80 specifications, cut speeds on 1/4 in. mild steel exceed 148 ipm at full output.
On 3-phase or 230V 1-phase input, the FlexCut 80 delivers 80A/140V at 80% duty cycle — meaning 8 minutes of continuous cutting per 10-minute cycle. At reduced output (60 A), it runs at 100% duty cycle with no thermal shutdown. For production CNC cutting applications with sustained cutting times, the 80% duty cycle at maximum output provides sufficient continuous operation for most table configurations. On 200V 1-phase input, the machine derate to 60% duty cycle at full 80 A output.
Yes. The FlexCut 80 uses a non-high-frequency pilot arc (blow-back/contact ignition) that initiates without direct contact to the workpiece. This is specifically designed for cutting expanded metal, perforated plate, and rusted or painted surfaces where maintaining arc continuity through gaps is essential. The non-HF design produces the pilot arc mechanically rather than electrically, eliminating RF interference that would affect CNC motion controllers and torch height control systems.
Yes. The FlexCut 80 (K4809-1) is the standard plasma power source for Lincoln Electric's Torchmate 4400, 4800, and 5100 CNC plasma cutting tables. It includes a divided arc signal output and CNC interface compatible with torch height control (THC) systems. Compatible machine torch packages (LC80M) are available in 25 ft, 50 ft, and 75 ft lead lengths. The non-HF arc start is a requirement for most CNC plasma table installations to prevent control system interference.
The FlexCut 80 requires 87–109 PSI (6.0–7.5 Bar) input air pressure with a flow rate of 380 SCFH (180 SLPM) at 80 A cutting. For a single machine, a compressor rated at 6+ SCFM at 100 PSI will sustain continuous cutting. A rotary screw compressor is recommended for sustained production CNC cutting; a large-tank reciprocating compressor (60-gallon, 5+ HP) can sustain the FlexCut 80 on lighter duty cycles. Moisture separation and filtration before the plasma inlet is strongly recommended to protect consumable life.