Novice must see! Safety Specification for Laser Operation and Cutting Precautions

As a novice in laser operation, safe and standardized operation is the top priority. The following are the key items that need special attention when cutting the workpiece, and must be strictly observed:

Safety first (personal safety & equipment safety)

1. Wear protective equipment:

Laser protective glasses: special protective glasses matching the laser wavelength (such as CO₂ 10.6 μm and optical fiber 1 μm) must be worn to prevent permanent damage to the retina. It is strictly forbidden to look directly at the laser beam or reflected light with naked eyes!

Protective gloves: Use when handling cut workpieces to prevent high temperature and burr cuts.

Protective clothing/apron: to prevent hot melt slag splash burns clothing or skin.

Dust masks/respirators: Cutting certain materials (e. g. acrylic, wood, certain metals) will produce harmful dust or smoke, so wear a suitable mask.

Earplugs (optional): Some devices are noisy.

2. Ensure the safety of the work area:

Clean up sundries: keep the work surface and around the equipment clean and tidy, free of inflammable and explosive materials (such as solvent, paper, cloth).

Good ventilation: it is necessary to open and ensure the normal operation of the exhaust/smoke exhaust system, and timely discharge the harmful gas and smoke generated by cutting.

Fire prevention measures: understand the location and use of fire extinguishers near the equipment. Be especially vigilant when cutting flammable materials.

Prohibit irrelevant personnel from approaching: set warning signs.

3. Safety of equipment:

DOOR/SHROUD: Make sure the equipment guard door/cover is fully closed when cutting. Never run the laser with the door open!

Emergency stop button: be familiar with the position of emergency stop button and press it as soon as possible in case of emergency.

Prohibit unattended: Operators must not leave during equipment operation.

Preparation before operation (key to avoid mistakes)

1. Carefully read the drawings and process card:

Clarify material type, thickness, size, cutting profile, process requirements (e. g. cutting speed, power, air pressure).

Check the size of the drawing and confirm that it is correct.

2. Correct selection and installation materials:

Material compatibility: confirm that the material used is suitable for this type of laser cutting (it is strictly prohibited to cut PVC, chlorine-containing plastics, unknown materials and other substances that will produce highly toxic gases).

Material flatness: to ensure that the plate is flat, no deformation, warping. Otherwise, the cutting effect and the focus position will be affected.

Material fixation: Use suitable clamps, magnets or platforms (such as honeycomb panels, racks) to firmly fix the material to prevent displacement or bounce during cutting. Make sure that the fixture does not block the laser head path!

3. Check the equipment status:

Laser/optical path: confirm that the laser is in normal condition (the chiller is running and the temperature is up to standard).

Gas supply: Check whether the type, pressure, flow rate of auxiliary gas (oxygen, nitrogen, compressed air) are correct and the connection is firm.

Lens cleanliness: focus on inspection! The focusing mirror and protective mirror must be clean, free from pollution and damage. Dirty lenses can greatly affect cutting quality and efficiency, and even damage the lens or laser head.

Nozzle: Select a nozzle with the appropriate bore diameter and type, and check that it is clean, free from damage, installed in place and centered.

Motion system: check whether the guide rail and lead screw are clean and lubricated without abnormal sound.

4. Set cutting parameters:

Reference process database: novices must set core parameters such as power, speed, frequency, duty cycle, air pressure, etc. strictly according to the material-thickness-parameter table provided by the equipment manufacturer or experience. Don’t guess by feeling!

Focus position: According to the material thickness and cutting requirements, accurately set the laser focus position (on the surface, inside or below the workpiece). Focus errors are one of the most common causes of cutting failure.

Perforation parameters: set the appropriate perforation time, height, power, to avoid blasting hole damage nozzle or lens.

5. Software operation:

Correct import/drawing graphics: ensure that DXF and other files are imported correctly, without overlapping lines, broken lines, self-intersecting and other errors.

Set the processing sequence: reasonably arrange the cutting path (first inner hole after shape, small hole first, path optimization to reduce air movement), improve efficiency and reduce thermal deformation.

Simulation processing: be sure to use the software simulation function to check the path before the formal cutting! Make sure that the laser head does not hit the fixture, material or platform, and the path covers all parts that need to be cut.

Cutting process monitoring (timely detection of problems)

1. Start cutting:

Reconfirm that all safety measures are in place (goggles, doors closed, exhaust on).

After pressing the start button, keep observing whether the initial stage (especially perforation) is normal.

2. Real-time observation:

Spark form: observe whether the cutting sparks are evenly and vertically sprayed downward (spraying from bottom to top usually indicates that the parameters are wrong or about to cut through).

Sound: Normal cutting should have a steady “hissing” sound. Abnormal popping and intermittent sounds may indicate problems.

Slag state: observe the slag adhesion at the bottom of the incision (too much, too little, and abnormal shape all indicate that the parameters need to be adjusted).

Smoke exhaust: Ensure that the smoke is effectively removed.

3. Exception handling:

If any abnormality is found (abnormal spark, material fire, abnormal equipment noise, excessive smoke, deviation of cutting contour, etc.), press the emergency stop button immediately!

Do not open the protective door to deal with problems while the equipment is running!

Post-cutting operation (from beginning to end)

1. Wait for cooling:

The temperature of the cut workpiece and waste is very high. Do not touch it directly with your hands, wait for it to cool or use tools (pliers, hooks) to take it out.

2. Take out the workpiece:

Carefully remove the workpiece, paying attention to burrs and sharp edges. Check the cutting quality (dimensional accuracy, section roughness, burning/undercut).

 3. Clean the workbench:

Remove waste and debris and keep the work area clean and tidy. Note that the scrap may contain sharp metal flakes or high temperature residues.

4. Equipment maintenance (daily/per shift):

Cleaning the lenses: extremely important! Clean the focusing mirror and protective mirror according to the specification (use special cleaning agent and dust-free cloth).

Cleaning the nozzle: Inspect and clean the inside of the nozzle.

Clean the workbench/filter screen: clean the dust and slag generated by cutting.

Check gas/cooling water: make sure it is sufficient.

Record the operation: if there is any abnormality or replacement of parts, make a record.

Special Tips for Beginners

Slow is fast: don’t rush for speed. Ensure safety and quality first, and naturally improve efficiency after proficiency. The parameter setting is rather “conservative” than “radical”.

Ask and learn more: When in doubt or uncertain, immediately consult an experienced colleague or supervisor. Do not attempt dangerous operations without authorization.

Strict compliance with regulations: The Safety Operation Regulations and Equipment Operation Manual of the plant or equipment are the highest guidelines and must be kept in mind and observed.

Stay focused: Focus when operating and avoid distractions.

Establish a checklist: make the above key steps (safety, preparation, parameters, and post-processing) into a checklist, check item by item before each operation, and develop good habits.

Pay attention to lens maintenance: the lens is the core of the laser equipment wearing parts, cleaning and maintenance is directly related to the cutting effect, cost and equipment life.

Laser cutting is a high-energy, high-precision processing method, safety negligence or operational errors may cause personal injury, equipment damage or material scrap. Caution and discipline are the cornerstones of a novice’s growth into a qualified operator.