Metals such as steel, stainless steel, aluminum, copper, brass, and titanium are well-suited for laser cutting operations, delivering excellent results.
However, different types of metals may require specific laser sources and parameter settings.
Laser cutting works by harnessing the high power density energy generated through laser focusing. Under computer control, the laser emits controlled, repetitive high-frequency laser pulses, forming beams with specific frequencies and pulse widths to perform cutting operations on metals. Below is a detailed overview of mainstream metal materials suitable for laser cutting:
1. Carbon Steel
Due to its carbon content, carbon steel absorbs laser beams well without significant reflection, making it ideal for laser cutting. Laser cutting machines are highly effective for processing carbon steel.
Application: Modern laser cutting machines can cut carbon steel plates up to 2mm thick. The cut edges, based on oxidation melting cutting mechanisms, can be controlled to a satisfactory width range, with thin sheet cuts as narrow as 0.1 mm.
2. Stainless Steel
Laser cutting stainless steel involves melting and vaporizing the material with energy released by the laser beam hitting the surface. This technique is particularly beneficial for industries where stainless steel is a primary material.
Key Factors: Cutting quality is influenced by parameters like cutting speed, laser power, and gas pressure.
Challenges: Compared to low-carbon steel, stainless steel requires higher laser power and oxygen pressure. High-pressure nitrogen gas can also be used to blow away molten material and prevent oxide formation, yielding a clean cut. Although effective, this method is expensive. A cost-effective alternative involves using compressed air filtered from nitrogen sources. When cutting mirror-finished stainless steel, protective laser film is essential to preserve the material’s integrity.
3. Aluminum and Its Alloys
Despite the versatility of laser cutting, materials like aluminum and its alloys pose challenges due to their inherent properties.
Techniques: Fiber lasers and YAG lasers are primarily used to cut aluminum. These systems handle aluminum well, including thicker sheets, with cutting thicknesses reaching 16mm with a 6kW laser or 12mm with a 45kW laser.
Considerations: The auxiliary gas helps blow away molten material for smoother edges. For some aluminum alloys, attention must be given to intergranular microcracks at the notch surface.
4. Copper and Its Alloys
Pure Copper: Due to its high reflectivity, CO2 lasers cannot cut pure copper effectively.
Brass: With high laser power and auxiliary gases like air or oxygen, brass can be cut efficiently for thinner sheets.
5. Titanium and Its Alloys
Titanium alloys, commonly used in aircraft production, produce high-quality cuts with laser cutting.
Characteristics: While minor slagging may occur at the bottom of cuts, it is easy to clean. Pure titanium efficiently converts focused laser energy into heat. Using oxygen as an auxiliary gas enhances cutting speed but can create an oxidized edge or risk overburning. For safety, air is recommended as an auxiliary gas for consistent cutting quality.
6. Alloy Steel
Most alloy structural steels and tool steels offer excellent edge quality with laser cutting. With proper parameter control, even materials that are traditionally challenging can achieve smooth, burr-free edges. However, tungsten-containing tool steels and hot-die steels may show corrosion and slagging during processing.
7. Nickel Alloys
Nickel-based alloys, also known as superalloys, come in various types, most of which can be processed using oxidation melting methods.
Laser cutting can perform both flat cutting and beveled edge cutting with smooth, precise edges, making it ideal for high-precision cutting tasks on metal plates. It stands as one of the most critical advanced manufacturing methods for metal finishing globally.
For information about metal surface treatment processes and sheet metal fabrication services, feel free to contact MulanMfg Sheet Metal Fabrication, a leading sheet metal manufacturing service provider in China. We specialize in ODM/OEM metal processing and continuously update industry insights while delivering high-quality sheet metal services for your reference.
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