Kjellberg CUTFIRE 70 Air Plasma Cutting System

Compact 70 A air plasma cutter for workshop and site cutting

The Kjellberg CUTFIRE 70 is the smallest of the four CUTFIRE systems listed here and belongs to a series of six mobile air plasma units that Kjellberg Finsterwalde rates from 35 to 125 A. It cuts with compressed air, accepts a hand-held or machine-mounted KjellCut torch, and is rated for 20 to 70 A cutting current. Kjellberg gives it a recommended cutting range of 20 mm in mild steel, a maximum capacity of 35 mm and a piercing capacity of 15 mm. At 28 kg and 585 x 303 x 505 mm it is the lightest unit in the group, which Kjellberg positions for workshops, metal fabrication and on-site work.

Technical specifications

How the automatic settings and monitoring work

Setup starts at the digital display. The operator selects the material, the material thickness and the cutting mode, and the system then determines cutting current, cutting pressure and cutting speed by itself. The control recognises the connected KjellCut torch and takes the torch type and the hose assembly length into account. Digital pressure control and continuous monitoring of input voltage, input current, temperature and gas flow support a stable process, and if the gas pressure falls below the required minimum the system stops the cut to protect the torch. Status and error messages appear on the display with short recommendations for action, and the interface can be switched between German and English and between metric and imperial units.

The unit also carries a CNC interface and a marking function. These extend it from manual cutting to mechanised work on a cutting table, for example for marking a part before it is cut out.

Where the CUTFIRE 70 fits and where a larger unit is better

The 60 % duty cycle at 40 °C and the 16 A mains fuse suit intermittent cutting of sheet, profiles and pipe. Kjellberg also names grating cutting and gouging among the applications. If daily work sits mostly above the 20 mm recommended range, or the cutting is nearly continuous, the 90, 105 and 125 A units in the same series offer higher ratings; check the table above against your thickness list before choosing. Plasma cutting depends on a clean, dry compressed air supply, so confirm the air quality and flow requirements in the manual before installation.

Documents and quotation

Kjellberg publishes a CUTFIRE series brochure that covers the technical data of all models in the range, the display operation and the main applications. A copy is attached to this page. For a quotation, send the model, the mains voltage and frequency available on site, the material and thickness to be cut, hand-held or table use, and the torch hose length. Related equipment is grouped under plasma cutting systems.