Answers to Your Laser Application Questions
From choosing the right machine to maintenance tips, here you’ll find answers to the most common questions from Yao Hung Laser customers—helping you get the information you need, faster.
Looking to improve welding stability and efficiency? Each welding method excels in specific applications.
If your production often faces challenges such as high precision requirements, material deformation caused by heat input, or low welding efficiency and yield, and you’re aiming to adopt a more stable automated welding process, then laser welding can effectively minimize heat distortion, enhance joint quality, and boost overall productivity.
Selection Guidelines:
- For thick plates and outdoor repairs, MIG/TIG is recommended.
- For applications emphasizing visual finish, choose TIG.
- For high precision, minimal deformation, and automation, laser welding is the ideal choice.
To better understand the differences between argon welding and laser welding across industrial applications, we recommend reading Argon vs. Laser Welding — Application Comparison and Selection Guide, as well as the ITRI Technical Journal (PDF): Analysis of Low Heat Input and Deformation Control in Laser Welding. Learn how to scientifically reduce heat-affected zones and minimize deformation to make data-driven process decisions with greater accuracy.
Whether it’s ultra-thin 0.3 mm stainless steel sheets or joining dissimilar metals such as aluminum and copper, laser welding can cover almost all types of metals. Compared with conventional arc welding, laser technology precisely controls the molten pool with a minimal heat-affected zone (HAZ), effectively reducing distortion, porosity, and excessive heat input. It is particularly suitable for precision manufacturing and automated production lines.
For manufacturers pursuing stable quality and high yield, laser welding has become a key technology in achieving smart manufacturing and consistent productivity.
- High thermal conductivity materials (e.g., aluminum, copper): Deep penetration with stable fusion, minimizing burn-through or warping.
- Precision components (sensor modules, medical parts): Concentrated heat input maintains structural stability and dimensional accuracy.
- Ultra-thin metal sheets (below 0.5 mm): Post-weld surface remains smooth, with no polishing or deformation required.
- Dissimilar metals and composites: Reduces cracking and metallurgical incompatibility, improving material bonding reliability.
To explore the fundamental principles and process characteristics in detail, visit our Complete Guide to Laser Welding Technology.
For real-world examples of laser welding in the EV and precision assembly industries, refer to AMADA WELD TECH｜Laser Welding Technology for Dissimilar Metals .
Laser welding generally offers higher energy efficiency than traditional welding methods, and for long-running automated production lines, energy efficiency equals cost efficiency. With its high power density and precise thermal control, laser welding significantly reduces overall power consumption by shortening processing time and minimizing heat loss under the same production capacity.
Key factors affecting power consumption:
- Workpiece thickness & material conductivity: High thermal-conductivity metals (e.g., aluminum, copper) require higher laser power.
- Laser parameters: Power, travel speed, wire feed rate, and focal distance all affect energy utilization.
- Automation level: Stable, continuous output minimizes standby losses and startup energy waste.
Overall comparison:
Compared to TIG/MIG arc welding, laser welding can save an average of 20–40% in electricity consumption. Since heat is concentrated precisely in the weld zone with minimal energy dispersion, it enhances both energy utilization efficiency and production performance.
Further evidence can be found in the Industrial Technology Department of the Ministry of Economic Affairs report: “I-TRI and Taiwan Mask Corporation Develop H-Beam Laser Welding Technology” . This technology, showcased at the TIMTOS exhibition, leveraged AI energy control to increase productivity by fivefold and achieve an 80% reduction in CO₂ emissions, demonstrating laser welding’s strong potential for energy-efficient and low-carbon manufacturing.
The return on investment for laser welding primarily comes from its higher production efficiency, process stability, and long-term energy savings.
Although the initial equipment cost is higher than traditional arc welding, manufacturers typically achieve a payback period of 6–12 months by reducing heat distortion, minimizing rework, and improving production line utilization.
Major cost-benefit advantages:
- Higher productivity: Welding speed increases 2–5×, ideal for automated and continuous production lines.
- Reduced material waste: Smaller heat-affected zones (HAZ) and minimal deformation improve material utilization.
- Energy efficiency: Shorter cycle times and better energy conversion lower long-term power costs.
- Stable quality: Uniform weld seams and reduced human error lower rework and inspection costs.
According to the Taiwan Ministry of Economic Affairs – Energy Administration report “Energy-Saving Technologies and Industrial Upgrades” , high-efficiency manufacturing technologies such as laser welding are now recognized as key investments in industrial transformation and carbon-reduction strategies.
Additionally, the UK’s TWI (The Welding Institute) published a study in Welding Journal titled “The Fibre Laser: A Newcomer for Material Welding and Cutting”, highlighting the economic efficiency and process reliability of fiber lasers, and confirming their strong ROI advantage for long-term manufacturing operations.
► Implementation Tip:
When transitioning from TIG/MIG to laser welding or integrating automation, conduct energy and cycle time benchmarking using representative parts. Establish a data-driven model that quantifies “Efficiency × Cost × Quality” to determine the most profitable investment timing for your production needs.
Adopting laser welding doesn’t have to happen all at once — the key is gradual upgrading. You can start from handheld → platform-type → robotic integration to expand step-by-step, minimizing initial investment risks.
It’s best to begin with the bottleneck process (such as exterior or precision parts) to verify stability and ROI before full adoption.
- Select the production bottleneck as the pilot process for implementation.
- Ensure fixture accuracy and positioning stability.
- Establish parameter settings and maintenance SOPs to reduce human error.
- Choose a control platform with modular expandability for future upgrades.
To explore advanced directions such as sensor integration and precision control in robotic laser welding, refer to the study by the University of Twente: “Sensor Integration for Robotic Laser Welding Processes.” This research demonstrates how a single laser head can perform seam tracking, process control, and quality monitoring — an essential reference for future automation and smart manufacturing upgrades.
Maintaining modern laser welding systems is much easier than most people expect.
Most models adopt a modular design, meaning daily maintenance mainly involves lens cleaning and checking the cooling system. Once operators receive basic training, they can handle routine maintenance on their own — no specialized service technician is required.
- Lens Cleaning: Wipe lenses regularly with medical-grade alcohol to maintain optical clarity.
- Cooling System: Check water levels daily, refill weekly, and replace coolant monthly to ensure optimal heat dissipation.
- Work Environment: Keep the optical path free from oil and dust; ensure a clean, well-ventilated workspace.
Additionally, regular maintenance and inspection are crucial for stable long-term performance.
Yao Hung Technology also offers an annual maintenance service plan for customers who prefer hassle-free, worry-free after-sales support.
Laser welding combines high safety with strong environmental performance, making it not only an efficient process but also a key technology for corporate ESG transformation and sustainable manufacturing.
Operational Safety and On-site Application:
- Non-contact process — no open flames, minimal noise, and almost zero spatter.
- With protective eyewear, shielding covers, and fume extraction, the risk of burns or smoke exposure is minimized.
- Handheld models allow flexible use for on-site repairs, mold restoration, and large-part welding.
- No dust or metal fumes, compliant with cleanroom and occupational safety standards.
ESG and Carbon Reduction Benefits:
Laser welding produces only about 10% of the carbon emissions of conventional TIG welding (around 2 kg CO₂ per ton of metal) and features low fumes, low energy use, and minimal consumables — all essential for green manufacturing.
- Over 90% lower CO₂ emissions compared with traditional methods.
- No spatter or exhaust gases, creating a cleaner and safer workspace.
- High energy efficiency supports ISO 14064 carbon accounting and net-zero emission initiatives.
Want to see how laser technology drives real sustainability and corporate social responsibility?
Check out our article “Laser Technology, Environmental Responsibility, and CSR”, which shares practical examples from production to ESG strategy.
You can also explore the National Science and Technology Council × National Tsing Hua University “Low-Carbon Laser Manufacturing” Study to see how academia is advancing carbon-neutral laser processes.
If the red light preview frame on your laser marking machine does not appear, it’s usually related to the software window settings or preview speed configuration. Please follow the steps below to check your setup:
- Check if the “Preview Toolbar” is enabled:
Open Marking Mate software → click the top menu “View” → ensure “Preview Toolbar” is checked and visible. (You can also press F7 as a shortcut to toggle it.)
* Tip: The “Preview Toolbar” window is usually located on the right panel of the Marking Mate interface.
- Adjust the red light preview speed:
If the preview frame disappears, it may be caused by improper speed settings. We recommend setting the preview speed between 3000 and 6000.
Too high or too low a value may prevent the red frame from displaying properly.
Note: After completing the above settings, run the red light preview again to confirm if it appears correctly. If the preview frame is still missing, check whether the laser head’s red light module is powered on, or contact Yao Hung Technology’s after-sales service for professional support.
Blurry or incomplete laser marking is usually caused by focus misalignment or lens contamination. Here are the common causes and recommended troubleshooting steps to restore clean, precise marking results:
Common Causes:
- Incorrect lens parameter setting: Using the wrong “Lens Type” in the Marking Mate software may result in improper focus depth, causing the beam to defocus.
- Improper focal distance adjustment: The laser is not precisely focused on the material surface, reducing energy density and marking clarity.
- Contaminated or aged optics: Dust, oil, or scratches on the lens can scatter the laser beam and lower marking accuracy.
How to Check and Improve:
- Verify lens parameters: Open Marking Mate → under “Working Field”, check that the “Lens Type” matches the actual installed lens.
- Adjust focal distance: Use a focus gauge or test marking to fine-tune the Z-axis height until the beam is perfectly focused on the material surface.
- Clean the lens: Wipe the focusing and protective lens gently using lint-free cloth and medical-grade alcohol to maintain optical transparency.
After completing these steps, text edges and line clarity should significantly improve. If the problem persists, please contact Yao Hung Technology’s after-sales service for professional inspection of the laser power and optical path alignment.
Laser black marking (also known as laser annealing) is a precise surface marking technique used for stainless steel artworks, jewelry, and high-end components. It creates a rich black tone through surface oxidation without damaging the base metal.
Recommended Settings:
- Reduce marking speed: Slower scan speed stabilizes heat input and prevents surface burning.
- Lower laser power: Use medium-to-low power to minimize energy density and avoid material damage.
- Increase pulse frequency: Higher frequency helps form a uniform oxide layer, enhancing color depth.
- Apply multiple light passes: Gradual layering produces deeper black tones while keeping the surface smooth.
By fine-tuning these parameters, you can achieve sharp edges, deep black color, and scratch-free surfaces. The optimal settings may vary depending on your laser source, material composition, and focal distance — we recommend running a few test markings before mass production.
Laser Deep Engraving is a precision process that removes multiple layers of metal through controlled energy stacking. If you want to achieve deeper engraving with sharp, clean edges, follow the key setup principles below:
Key setup guidelines:
- Use a short or medium focal-length lens: Concentrates laser energy density, improving material removal efficiency and depth control.
- Increase laser power output: Higher power accelerates depth accumulation, but avoid overheating or surface melting.
- Lower the pulse frequency: Reducing frequency increases per-pulse energy, enhancing ablation strength and metal removal.
- Control scanning speed: Slower speed focuses energy in one area, allowing greater depth per pass.
- Engrave in multiple thin layers: Gradual layer-by-layer engraving ensures deeper marks without deformation or surface burns.
- Improve dust extraction and cleaning: Deep engraving produces significant metal debris; use an exhaust system and regular cleaning to maintain quality and machine safety.
Different metals (such as stainless steel, aluminum, and copper) absorb laser energy differently. Always fine-tune parameters based on the material’s reflectivity and heat conductivity. We recommend performing small-scale test runs to balance depth, smoothness, and edge sharpness for the best engraving quality.
The X.Y-axis motion stage is a key component that enhances marking precision and production efficiency, especially in large-area and high-stability laser marking applications.
If your production faces challenges like limited marking range or inconsistent positioning for multi-part jobs, an XY motion stage offers the most effective solution.
When to use an XY motion stage:
- Mass-production marking: Ideal for repetitive, high-volume jobs requiring continuous automation and consistent alignment.
- Large marking area: When a single lens cannot cover the full surface, the XY stage extends the marking range with precise overlapping control.
- Accurate image scaling: Prevents distortion from multiple repositioning steps, maintaining original proportions and design clarity.
- High-precision consistency: Combining precision motion control with automation software ensures micron-level accuracy and repeatability.
Summary: The XY motion stage is ideal for large-area engraving, batch processing, and fixture-based marking, significantly improving automation efficiency and product uniformity.
For custom motion systems or multi-axis integration, contact Yao Hung Technology Co., Ltd. for a tailored automation solution.
The key difference lies in the engraving mode.
Text uses vector engraving, where the laser follows contour lines with short, simple movements.
Images use raster engraving, scanning point by point like a printer. Even blank areas must be scanned, which increases processing time.
Main reasons for slower raster engraving
- Different motion modes: Vector engraving follows paths, while raster engraving scans every pixel across the whole area.
- Larger data volume: Raster images contain massive pixel data, creating heavier processing loads.
- Resolution (DPI): Higher DPI means more dots to calculate and scan, extending total engraving time.
- Heat accumulation: Continuous heating in the same area causes burning, requiring slower speeds to prevent damage.
- Acceleration inertia: Frequent start-stop motions add delay due to mechanical acceleration/deceleration cycles.
Practical tips to improve engraving efficiency
- Adjust resolution properly: Choose suitable DPI—too high resolution only slows down processing.
- Optimize fill spacing: Reducing overlap between scan lines can significantly increase speed.
- Preprocess images: Enhance contrast and remove unnecessary grayscale before output to reduce computation load.
- Keep grayscale details: Don’t convert detailed or shaded images directly into vector lines—it will cause quality loss.
Conclusion: For images containing shading or gradients, stick with raster engraving. Fine-tune parameters like DPI, fill spacing, and power/speed to achieve the right balance between speed and quality.