JallyTalk-Demark Laser

From stepping into this industry over 20 years ago to today — I want to say thank you to every customer who has trusted DMK.


I'm Jally, founder of DMK Laser. When I first entered the laser industry more than two decades ago, I never imagined that one day our equipment would be running in factories across so many countries around the world.

Along this journey, what I'm most proud of is not how many machines we've sold, but the customers who chose us, trusted us, and even helped us become better.

Some of you started with a single handheld welder and now run fully automated production lines. Some began as small local workshops and now serve end-users in over a dozen countries. Some of you messaged me late at night when you ran into installation issues, and we stayed up together until we found a solution.

These are the moments that remind me: building laser equipment is not about a one‑time deal — it's a long‑term responsibility.

That's why we launched our "Machine Sourcing Festival" this third quarter — not to chase sales numbers, but to give back to our new and old friends in a more tangible way.
The Core 3‑Piece Package (laser source + processing head/control system + chiller) comes directly from tier‑1 channels, with full traceability. Raycus lasers carry a 26‑month warranty, counted from our shipping date.


This isn't an ad. It's my personal commitment, as founder, to everyone who puts their trust in DMK.

Drop a comment and share your story with DMK — whether you're a long‑time partner or just getting to know us, I'd love to hear from you.

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6 days ago | [YT] | 10

JallyTalk-Demark Laser

What a joyful day! 🎉
Cake 🍰, gifts 🎁, flowers 💐, games 🎮—and the warmest company of my wonderful colleagues. Today, DMKlaser held our group birthday party, and I was truly honored to be one of the birthday celebrants alongside our amazing team.

To all my colleagues: may your work always thrive, and as for me—well, I’ll keep wishing myself forever young, forever eighteen! 😄

We were also delighted to have our friends from Brazil join the celebration during their DMK laser technology training. It was a double celebration, as they received their DMK certification today! A big congratulations to these three talented engineers and to every birthday star among us.

Thank you for all the love and cheer. Here’s to many more sweet moments together.

——With heartfelt best wishes, Jally

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3 weeks ago | [YT] | 9

JallyTalk-Demark Laser

The Dragon Boat Festival traces back over two thousand years to a journey rooted in the spirit of "safeguarding."
Dragon boat races honor heroic souls, while the fragrance of *zongzi* leaves pays tribute to loyal spirits.

Today, DMK takes up the baton of this "safeguarding" legacy—
Yet, we sculpt time with light and define quality through precision.

May your life strike happiness with laser-like precision;
May our endeavors forge ahead, cutting through waves at full speed like a dragon boat.

While *zongzi* offer a myriad of flavors, light possesses immense, mighty power.
Wishing you a peaceful and healthy Dragon Boat Festival; DMK is here to safeguard you with the passion of light.

1 month ago | [YT] | 4

JallyTalk-Demark Laser

Laser Cleaning Heads Enter the 2.0 Era



Today, we are introducing two newly upgraded cleaning heads and the significant improvements they offer.

Following R&D, finalization, and rigorous testing, our new cleaning heads—compatible with 100W–1000W pulsed lasers—were officially launched last month. Key upgrades include:



1. Cleaning width increased to 200mm, significantly boosting efficiency
Previously, the maximum cleaning width was only 110mm. After incorporating customer feedback and analyzing market trends, we redesigned the galvanometer, optical path, and f-theta lens to expand the cleaning width to 200mm without compromising beam quality. This improvement substantially increases operational efficiency in applications such as removing surface rust and cleaning narrow workpieces.



2. Added status indicator light for enhanced operational safety
While this feature was present on earlier low-power air-cooled models, it was previously removed to accommodate expanded cleaning functions. Since laser cleaning machines utilize an invisible 1064nm infrared laser, we have added an integrated front-and-rear status indicator light to warn nearby personnel and clearly signal the laser's operating status.



3. Flip-cover protection to prevent accidental operation
The flip-cover protection feature on the GT-500 cleaning head was highly acclaimed for effectively preventing issues such as accidental laser firing or firing with the lens cap still attached. We have retained this design on the new 100–300W pulsed cleaning heads, receiving positive market feedback.



4. Ergonomic emergency stop button included as standard
Previously, emergency stop buttons were optional add-ons with less-than-ideal aesthetics, even though some countries mandate their inclusion. To further enhance safety and mitigate accident risks, both new cleaning heads come standard with an emergency stop button. In an emergency, a simple press with the thumb cuts off power, the laser beam, and the gas supply, eliminating potential hazards.



5. Fully equipped as standard—more features at no extra cost
In the past, features like "laser-off on defocus" and emergency stop buttons were optional extras requiring additional payment. Our standard cleaning heads now come fully integrated with features such as beam cutoff upon defocus, dual-red-dot assisted focusing, an emergency stop button, status indicator lights, a rotatable control screen, and a protective flip cover; additionally, an optional cleaning head work light can be added at no extra cost depending on the operating environment. Furthermore, models with power ratings below 300W feature a standard fiber-bend protection design to prevent costly damage caused by fiber breakage.



From the very beginning of R&D, the development of our two laser cleaning heads has centered on two core priorities: genuine customer needs and operational safety. We carefully incorporated user feedback regarding cleaning efficiency and ease of use, increasing the maximum scan width from 110mm to 200mm and adopting a "standard-means-fully-loaded" approach—delivering enhanced capabilities without raising the price. At the same time, we have elevated safety standards to an unprecedented level; features such as status indicators, protective flip covers, and emergency stop buttons across the entire lineup are designed to maximize the safety of operators and on-site personnel during operations involving invisible infrared laser beams. This upgrade represents not only a revolution in product performance but also a tangible demonstration of our commitment to our customers and our deep respect for safety.

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1 month ago | [YT] | 12

JallyTalk-Demark Laser

High-End MOPA Laser Marking Application: High-Brightness Mirror-Finish Laser Engraving
💡 Technical Principle: From Micro-Level "Melt-Smoothing" to Macro-Level "Mirror Finish"
At its core, this technology is a process of physical modification rather than a chemical reaction. It alters the surface's microscopic topography by using a laser heat source to remelt the material.
Laser Surface "Melt-Smoothing": The essence of high-brightness laser engraving lies in focusing a high-power continuous laser beam (typically with processing power >120W and peak power up to 200W) onto the aluminum alloy surface. This generates intense heat instantaneously, rapidly melting the surface metal into a liquid state.
Physical Rearrangement and Solidification: Driven by surface tension, the molten metal flows naturally to fill in existing microscopic irregularities. Subsequently, the metal cools and resolidifies rapidly, creating a new, flat, and glossy surface.
"Roughness" as an Advantage, Not a Hindrance: A slightly rough aluminum alloy surface absorbs laser energy more effectively; conversely, an overly smooth surface (such as a highly reflective mirror finish) reflects most of the laser energy, making processing difficult. Therefore, surfaces prepared via processes like sandblasting provide an ideal "canvas" for the subsequent mirror-finish marking.
The final result is influenced by parameters such as laser power, scanning speed, and fill spacing, as well as the specific aluminum alloy material. There are three typical application workflows: laser marking followed by overall anodizing (yields the best results; suitable for high-end electronics); anodizing followed by laser marking (simpler process but damages the oxide layer; suitable for small-batch modifications); and laser marking after sandblasting (creates a brilliant logo against a matte background; used for automotive interiors, sports equipment, etc.).

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1 month ago | [YT] | 2

JallyTalk-Demark Laser

Why does the workpiece turn black after laser rust removal, even though the rust is gone?

There are five main reasons why the material turns black after laser rust removal.
First, thermal damage caused by laser energy. If the laser power is too high or the scanning speed is too slow, the laser dwells on the same area for too long; continuous heat accumulation causes ablation or remelting of the metal substrate surface, forming a black oxide layer. Even with pulsed lasers, if the repetition frequency is too high—preventing heat from the previous pulse from dissipating—subsequent pulses can cause a cumulative thermal effect, ultimately leading to oxidation and blackening.
Second, high‑temperature oxidation reactions. The high temperatures generated during laser rust removal cause the metal substrate to react with atmospheric oxygen, producing black oxides such as iron(II,III) oxide (magnetite). This is the most common cause of blackening when operating in an air environment.
Third, the transformation of rust types—which is not necessarily a bad thing. Yellow‑brown goethite can transform into black magnetite under laser action; this transformed layer is denser, more stable, and even offers some protective qualities, though it still appears black.
Fourth, differences in laser characteristics. Continuous‑wave lasers deliver constant energy, leading to significant heat accumulation and a high risk of substrate remelting and severe oxidation, resulting in pronounced blackening. Standard pulsed lasers, due to their extremely short pulse durations, exhibit “cold processing” characteristics—heat does not have time to conduct deep into the substrate, so blackening is minimal. However, high‑power multimode pulsed lasers—despite being pulsed—can still cause heat accumulation due to the combination of high power and high frequency. Additionally, multimode flat‑top beams may require higher total energy to remove the rust layer, or localized overheating at the beam edges can occur, potentially leading to blackening.
Fifth, the initial state of the material. If the original rust layer contains a large amount of tightly bonded black rust, the laser’s removal efficiency is reduced, and the residual black rust makes the surface appear black.

To address these causes of blackening, the following solutions are primarily employed.

First, optimize laser process parameters—this is the most critical measure. Specific actions include: appropriately lowering laser power to identify the energy threshold that removes rust without damaging the substrate; increasing scanning speed to reduce dwell time per point and minimize heat accumulation; lowering pulse frequency to prevent thermal overlap from successive pulses; maintaining a beam overlap rate between 20% and 50%; and optimizing pulse duration based on material properties, as excessively short pulses risk substrate damage while excessively long pulses increase the heat‑affected zone.

Second, enhance surface cooling. Using a blower or air knife during the cleaning process offers two benefits: it prevents removed contaminants from re‑adhering to the surface and helps lower the workpiece temperature, thereby suppressing high‑temperature oxidation reactions at the source and yielding a bright metal finish.

Third, select the appropriate laser type based on the material and the condition of the rust. For large areas with thick rust layers where surface quality requirements are less stringent, continuous‑wave (CW) lasers can be used to prioritize efficiency, accepting a certain degree of surface darkening. For high‑precision, high‑value components where substrate integrity is paramount, single‑mode or low‑power pulsed lasers—combined with a shielding gas—are preferable. In cases of heavy rust where laser treatment alone may be insufficient, consider mechanical pre‑treatment or alternative rust removal methods.

In summary, the darkening associated with laser rust removal is primarily caused by oxidation or ablation resulting from uncontrolled heat management. The solution lies in reducing heat input, accelerating heat dissipation, and fine‑tuning parameters such as power, speed, frequency, and overlap rate to strike the optimal balance between cleaning effectiveness and thermal damage. I hope this information proves helpful.

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1 month ago | [YT] | 11

JallyTalk-Demark Laser

To facilitate the filming of the cleaning process, we have developed a custom mount for attaching an action camera to the cleaning head.

In the past, filming cleaning operations single-handedly was often challenging. Furthermore, using a neck-mounted camera typically resulted in the cleaning head—held in both hands—obstructing the camera's field of view. To address this, we designed this mount specifically to fit the dimensions of the cleaning head, ensuring it does not interfere with the unit's functionality or heat dissipation. Produced via FDM 3D printing and secured with screws, the mount weighs a mere 60 grams. It enables users to record the entire cleaning process using an action camera, consistently keeping the laser spot centered within the frame while maintaining relative stability. Our testing has demonstrated excellent results, and the installation process is quick and convenient. Additionally, the action camera can be easily adjusted—either horizontally or vertically—to suit your specific needs, providing excellent footage for social media sharing. If you require the design blueprints or wish to obtain the mount itself, please feel free to email me or contact your dedicated sales manager. If you require the mount, we would be happy to provide it to you free of charge alongside your equipment purchase. We hope this proves to be a helpful addition to your workflow.

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1 month ago | [YT] | 6

JallyTalk-Demark Laser

How Often Should You Replace the Protective Lens in a Laser Welding Machine? Don't Wait Until the Welding Gun Breaks to Regret It!
There is no fixed replacement schedule for the protective lens; it relies entirely on "observation" and "feel."
Remember these key warning signs—replace the lens immediately if any appear:
1. **Discontinuities in the red indicator light or unevenness in the fiber beam:** This typically signals that the lens has already sustained damage, manifesting as "burn spots."

2. **Deteriorating welding quality:** If you observe a gradual drop in power output, increased spatter, insufficient weld penetration, or uneven weld seams during operation, it usually indicates that the protective lens is damaged—and the damage is progressively worsening.

3. **Abnormal overheating of the welding gun:** This typically occurs because a damaged protective lens absorbs a significant amount of laser energy, which is then conducted into the internal cavity of the welding gun.

How Can You Extend the Lifespan of the Protective Lens?

First, ensure the purity and pressure of the assist gas; use high-purity shielding gas and verify that the pressure is adequate.
Second, practice proper lens replacement procedures: perform the replacement in a dust-free or low-dust environment whenever possible, and strictly avoid touching the lens surface.
Finally, use only original manufacturer or high-quality aftermarket protective lenses; inferior lenses can lead to more frequent replacements, thereby increasing production costs.
Lastly, maintain constant vigilance during operation by establishing a routine maintenance habit: "Inspect before every shift, clean immediately if soiled, and replace if damaged." This practice not only extends the service life of the protective lens itself but also effectively safeguards the expensive core optical components housed within the welding gun. How often do *you* typically replace yours? Let's discuss it in the comments section!

If you require any further assistance regarding laser welding, please feel free to email me.

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1 month ago | [YT] | 9

JallyTalk-Demark Laser

Why doesn’t your laser cleaning look as good as the videos online?
Pay attention to these tips – you’ll get great results too.

1. Keep your “gun work” steady.
When cleaning, always keep the right focus. Avoid defocusing. How do you know if you’re defocused?

First, check whether the two red auxiliary focusing dots overlap (standard on most DMK handheld cleaning heads).

Second, observe the process: the brightest reflected light and the loudest sound indicate the focal point. Move steadily within the focal range, like ironing clothes.
This is especially important for sensitive materials like wood. Even one defocus or a long pause can cause burning or blackening, ruining the cleaning result.

2. Match the parameters.
Before starting your main job, run a small test using the preset parameters. Once you get the expected result, then proceed to larger areas. If the effect isn’t ideal, adjust the pattern and parameters accordingly. This prevents irreversible damage to your workpiece.

3. Regular maintenance.
As a general rule:

For continuous-wave lasers (1500W), turn off the enable and check the lens every 4 hours.

For pulsed lasers (500W), check the lens once a day.

Higher power means more frequent checks.
If you’re working in harsh environments (dusty, smoky), watch for signs like reduced output power, weaker cleaning ability, or abnormal head temperature. In those cases, inspect and replace the lens as needed.

4. Don’t forget dust removal or air blowing.
This has several benefits:

Protects your lens – prevents dust from getting onto the protective window.

Quickly blows away vaporized residue before it re‑condenses and re‑sticks to the surface.

Cools down the workpiece surface, reducing heat‑related discoloration (yellowing/blackening) and thermal distortion.

That’s all for these quick laser cleaning tips.
If you have any questions or run into issues with your equipment, feel free to leave a comment or send me an email – I’ll reply to each one.

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1 month ago | [YT] | 4

JallyTalk-Demark Laser

Why is continuous laser cleaning prone to burning the lens?
The fundamental reason lies in its continuous output mode, which ultimately leads to a vicious cycle of escalating risk. The core process is: contamination creates hot spots → heat cannot dissipate (due to continuous laser) → thermal lensing effect → temperature runaway, eventually burning the lens.

So how to avoid it?

Keep the lens clean: This is the first line of defense against hot spots. Regularly inspect the lens, and clean it using dedicated tools and proper techniques.

Ensure effective cooling: Make sure the lens holder's water cooling system is functioning properly, with coolant flow and temperature parameters meeting the required standards to efficiently remove heat.

Follow proper operation and parameter settings: Before operation, always calibrate the beam path and ensure the focal point is on the workpiece. Select appropriate power for the task, avoid prolonged operation at extreme limits, and reduce the thermal load on the lens.

Choose high-quality lenses and replace them in time: Select lenses with a high Laser-Induced Damage Threshold (LIDT) and good quality. Replace the protective lens at a maintenance interval of every 4 hours of continuous operation as a reference, ensuring the optical system remains in optimal condition.

Ensure clean gas supply: Use a high-quality, oil-free, water-free air compressor from a reputable brand. If possible, add an air dryer. Ensure the gas quality is reliable.

I hope these tips help you.

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2 months ago | [YT] | 6