Laser cutting machines offer exceptional precision and efficiency when processing metals. While metals generally have low initial laser beam absorption rates (ranging from 0.5% to 10%), the absorption increases dramatically (60%–80%) once the material begins to melt. This allows the laser to rapidly penetrate and cut through metal sheets with high accuracy. Below are seven common metal materials that can be effectively processed using laser cutting technology.
1. Carbon Steel
Laser cutting performs exceptionally well on carbon steel, with a maximum cutting thickness of up to 25mm. Using oxygen as an assist gas, the oxidation reaction helps achieve smooth cuts with a narrow kerf-as small as 0.1mm for thin sheets. This method ensures high efficiency and excellent edge quality.
2. Alloy Steel
Alloy structural steels and tool steels can be cleanly cut with lasers. When oxygen is used, the cut edges may show slight oxidation. For thinner plates (up to 4mm), nitrogen-assisted high-pressure cutting prevents oxidation, resulting in a clean, burr-free finish.
3. Stainless Steel
Laser cutting is widely used in stainless steel fabrication due to its ability to minimize heat input and reduce the heat-affected zone (HAZ). This preserves the material's corrosion resistance while delivering precise cuts. Both austenitic and ferritic stainless steels can be processed efficiently.
4. Aluminum and Its Alloys
Although aluminum has high reflectivity and thermal conductivity, laser cutting is still feasible for thin sheets. Oxygen cutting produces a rough surface, while nitrogen yields a smoother finish. Pure aluminum is particularly challenging due to its extreme reflectivity, requiring specialized anti-reflective laser systems to protect optical components.
5. Copper and Brass
Copper and brass have excellent reflectivity and heat dissipation, demanding higher laser power for effective cutting. Air or oxygen can be used as assist gases for thinner sheets. However, similar to aluminum, the high reflectivity of copper requires careful system configuration to avoid damaging the laser optics.
6. Titanium and Titanium Alloys
Titanium absorbs laser energy efficiently, allowing for fast cutting when oxygen is used. However, excessive oxidation may occur, leading to overburning. For better quality, nitrogen or argon is recommended to prevent oxidation and ensure clean edges. Titanium alloys, commonly used in aerospace, can be cut smoothly with minimal dross formation.
7. Nickel-Based Alloys (Superalloys)
Nickel-based high-temperature alloys, such as Inconel, are often cut using laser oxidation-assisted methods. These materials can be processed with high precision, though some sticky residues may form at the cut edges. Proper gas selection (oxygen or nitrogen) helps achieve optimal results.
Conclusion
Laser cutting technology provides a versatile and efficient solution for processing various metals, from carbon steel to high-reflectivity materials like copper and aluminum. By selecting the appropriate assist gas and laser parameters, manufacturers can achieve high-quality cuts with minimal material waste, making laser cutting indispensable in modern metal fabrication. For more information, contact us rayther@raytherlasercutter.com.
-- Rayther Laser Allen Wang