LGK-120: 120A IGBT Inverter Air Plasma Cutter — High-Power Plasma Cutting Machine
LGK-120
120A High-Power Plasma Cutter
Part of the Plasma Cutters product line. Designed and manufactured in Qingdao, China with IGBT inverter technology for reliable industrial performance. CE certified for global export.
Typical Applications: 45mm cut, heavy plate fabrication
LGK-120 Air Plasma Cutter
The LGK-120 is a high-power 120A three-phase plasma cutter designed for heavy plate fabrication, mining equipment manufacturing, and bridge construction. With a quality cut capacity of 45 mm on mild steel and a maximum severance capability of 60 mm, it occupies the upper-middle tier of the LGK series and is a popular choice for workshops that regularly process plate in the 30 to 45 mm range. The 380V three-phase IGBT inverter delivers an 80% duty cycle at full rated output and an efficiency rating above 86%, keeping operating costs predictable in high-volume cutting environments.
The LGK-120 represents a significant step up from the LGK-100, adding 20% more cutting current and a 10 mm increase in both quality cut and severance capacity. It is built on a reinforced 25 kg steel chassis with integrated fork pockets for crane or forklift lifting and features the PT-120 torch with a 1.5 mm nozzle orifice for fast, narrow-kerf cutting. The machine includes a digital amperage and air pressure display, a CNC interface port, and a post-flow cooling timer adjustable from 10 to 60 seconds for optimising consumable life across different material thicknesses.
Detailed Specs — LGK-120
| Parameter | Specification |
|---|---|
| Model | LGK-120 |
| Rated Input Voltage (V) | AC 380V ±15% |
| Phase | Three-Phase |
| Frequency (Hz) | 50 / 60 |
| Rated Input Power (kVA) | 18.0 |
| Rated Output Current (A) | 120 |
| Output Current Range (A) | 35 – 120 |
| No-Load Voltage (V) | 340 |
| Rated Load Voltage (V) | 128 |
| Rated Duty Cycle | 80% @ 120A / 128V (40°C) |
| Max Cutting Thickness – Quality (mm) | 45 |
| Max Cutting Thickness – Severance (mm) | 60 |
| Plasma Gas | Compressed Air (0.5 – 0.7 MPa) |
| Air Flow Requirement (L/min) | Ge 250 |
| Arc Starting Method | High-Frequency Pilot Arc |
| Insulation Class | F (155 degrees C) |
| Protection Class (IP) | IP22S |
| Power Factor (cos phi) | 0.93 or above |
| Efficiency (%) | 86 or above |
| Dimensions L x W x H (mm) | 620 x 310 x 480 |
| Net Weight (kg) | 25 |
| Built-in Compressor Option | No |
| CNC Interface | Standard (arc-on / divided voltage) |
| Torch Type | PT-120 / AG-120 |
| Cooling Method | Forced Air (Dual Fan Cooled) |
| Certification | CE (CSA, EAC available) |
Where the LGK-120 Excels
Mining Equipment Fabrication
Cutting wear plates, bucket liners, and chassis components from high-strength quenched and tempered steels. Clean cuts on HARDOX and JFE-EH grades up to 45 mm.
Bridge Construction
Cutting main girder web plates, splice plates, and bearing stiffeners from structural steel up to 45 mm. Narrow kerf width preserves material in high-grade S355 and S460 plate.
Shipbuilding & Offshore
Production cutting of hull stiffeners, bracket plates, and deck panels. The 80% duty cycle handles uninterrupted cutting across an entire shift in panel line applications.
Oil & Gas Pipe Cutting
Bevel cutting and weld preparation on large-diameter pipe up to 45 mm wall thickness. Compatible with pipe-cutting carriages and orbital cutting attachments.
Heavy Equipment OEM
CNC cutting of chassis rails, boom plates, and counterweight housings for excavators, bulldozers, and material handlers. Reliable performance in multi-shift production environments.
Scrap & Dismantling
Severance cutting of heavy structural sections, pressure vessels, and large-diameter pipe during plant dismantling and shipbreaking. 60 mm maximum severance handles the thickest demolition tasks.
LGK Series — Amperage Comparison
| Parameter | LGK-60 | LGK-80 | LGK-100 | LGK-120 | LGK-160 |
|---|---|---|---|---|---|
| Rated Current (A) | 60 | 80 | 100 | 120 | 160 |
| Input Voltage (V) | 220V 1-Phase | 220/380V | 380V 3-Phase | 380V 3-Phase | 380V 3-Phase |
| Quality Cut (mm) | 15 | 25 | 35 | 45 | 55 |
| Max Severance (mm) | 25 | 35 | 50 | 60 | 80 |
| Duty Cycle | 60% @ 60A | 60% @ 80A | 80% @ 100A | 80% @ 120A | 100% @ 160A |
| Weight (kg) | 8 | 12 | 18 | 25 | 40 |
| Built-in Compressor | Optional | Optional | No | No | No |
| Best For | Light fab, HVAC, mobile | Medium fab, shops | Structural, shipyard | Heavy plate, mining | Foundry, heavy industry |
Why Choose the LGK-120
45 mm Production Cut Capacity
A 20% increase in cutting current over the LGK-100 translates to a 10 mm improvement in quality cut depth. Shops processing plate in the 30-45 mm range see significantly faster travel speeds and reduced consumable wear per metre of cut.
Integrated Water/Oil Separator
A high-efficiency coalescing filter integrated into the rear air inlet panel removes moisture and oil aerosols down to 0.01 micron. Dry, clean plasma gas extends electrode and nozzle life by 30 to 50 percent compared to machines without adequate filtration.
Adjustable Post-Flow Timer
Operator-adjustable post-flow cooling from 10 to 60 seconds allows fine-tuning of consumable cooling time for different material thicknesses. Longer post-flow on thick cuts extends electrode life; shorter cycles on thin sheet increase cycle speed.
Forklift-Ready Chassis
Integrated fork pockets in the 25 kg steel chassis allow safe lifting by forklift or overhead crane. Reinforced corner bumpers protect the machine in busy fabrication shop environments where equipment is frequently repositioned.
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