Fiber Laser Cutting Terminology Explained

If you are new to metal fabrication or shopping for a fiber laser cutting machine, you will encounter many technical terms. Understanding these phrases helps you communicate better with suppliers, compare machine configurations and avoid misunderstandings during quotation and testing. Below we explain the most widely used fiber laser cutting terminology.

Laser Source

The core component that generates the laser beam. Common types are fiber laser sources. Rated power (such as 3kW, 6kW, 12kW) determines cutting capacity for different metals and thicknesses. Famous laser source brands offer stable beam quality and long service life.

Beam Quality (M² Factor)

A value that describes how focused and concentrated the laser beam is. An M² value closer to 1 means better beam quality, sharper focus, cleaner cuts and less heat spread on the workpiece.

Kerf

The narrow slot cut by the laser beam through metal. Fiber laser cutting has a very thin kerf, which improves material utilization and allows precise small-hole machining.

Heat-Affected Zone (HAZ)

The area of metal next to the cut edge that is heated but not fully cut. A small HAZ means less thermal deformation, which is critical for thin aluminum, stainless steel and precision parts.

Piercing

The process of drilling an initial hole before starting a continuous cutting path. Thick plates require longer piercing time. Modern machines use pulse piercing for faster results.

Assist Gas

Gas delivered through the cutting head to blow away molten metal and protect the lens. The three most common assist gases:

• Compressed Air: Low cost, mainly for thin carbon steel.
• Oxygen: Used for thick carbon steel; oxygen supports burning to speed cutting.
• Nitrogen: Produces oxide-free, bright edges on stainless steel and aluminum; no post-rust risk.

Nozzle

A replaceable tip at the bottom of the cutting head. It guides assist gas and shapes the gas flow. Nozzle size is selected based on laser power, material and cutting speed.

Focal Length / Focus Lens

The lens inside the cutting head that focuses the laser beam. Short focal length lenses are for thin sheets; longer focal lenses suit thicker plates.

Stand-off Distance

The small gap between the nozzle tip and the metal surface. Stable stand-off ensures consistent gas flow and prevents nozzle collision.

Nesting

Software function to arrange many part drawings tightly on one metal sheet. Good nesting reduces scrap rate and saves raw material cost.

Exchange Table / Shuttle Table

Two worktables that switch automatically. While one table is cutting, operators can load or unload parts on the other, reducing idle waiting time.

Rotary Axis / Rotary Chuck

Optional attachment for tube and pipe cutting. It clamps and rotates round, square or rectangular tubes, enabling the machine to cut holes, notches and bevels on profiles.

CNC Controller

The machine’s control system. It reads CAD/DXF drawings, runs cutting programs, adjusts speed, power and gas parameters automatically.

Cut Quality: Dross / Slag

Molten metal that sticks to the bottom edge of the workpiece. Too much dross means poor cutting parameters or wrong assist gas. Parts with heavy dross need deburring afterward.

Collision Protection

A safety function on the cutting head. If the head hits the workpiece or fixture, it triggers protection to stop movement and avoid expensive lens or head damage.

Continuous Wave (CW) Laser

Most standard fiber lasers work in continuous wave mode, delivering steady laser output for fast metal cutting. It differs from pulsed lasers used for marking or fine engraving.

Final Note

When you request a quote or cutting test, you can refer to these terms to clearly state your requirements: material type, thickness, required edge finish, assist gas preference and whether you need rotary tube cutting function.

We are a professional fiber laser cutting machine manufacturer located in Jinan, Shandong, China. We supply sheet fiber laser cutters, sheet & tube integrated laser machines and automatic deburring equipment. Custom laser power, working size and accessories are available. We provide cutting sample tests, operation training and global after-sales support. Contact us if you have questions about laser machine configurations.