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.

Skip the Carousel

1 2 3 4

5 days ago | [YT] | 8

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.

Skip the Carousel

1 2 3 4

1 week 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.

Skip the Carousel

1 2

2 weeks ago | [YT] | 6

JallyTalk-Demark Laser

Australian Made Week Wraps Up: A Heartfelt Thank You to Everyone Who Stopped by DMK
📍 Australia · Australian Made Week 2026 · Closing Reflections
#AustralianMadeWeek #DMKGoesGlobal #ChinaLaserManufacturing

As the three-day exhibition concludes and I return to the hotel to organize our materials, I can still vividly recall the constant stream of visitors actively engaging with our equipment at the booth.

The GT-500 model we brought along turned out to be a "pleasant surprise" for many Australian tradespeople and contractors—praised for being lightweight, stable, and exceptionally powerful. Many local customers went from "just browsing" to picking up the tool to experience it firsthand, asking for quotes on the spot; indeed, the very display unit we brought was sold right there at the exhibition.

My biggest takeaway from this experience is this:
In the past, the Australian market's perception of Chinese-made equipment was often stuck on stereotypes—"low-cost," "barely adequate," and "poor after-sales support." However, this time, through our superior product quality and excellent service, DMK has begun to gradually dismantle those prejudices.

🎯 Three Reasons Why This Trip Was "Worth It":
1️⃣ We allowed hundreds of overseas customers to experience DMK's rigorous quality control standards firsthand.
2️⃣ We engaged in face-to-face conversations with customers regarding their actual usage of our equipment.
3️⃣ We gathered authentic market feedback—making the direction for our next product iteration much clearer.

A special thank you to our team for their technical support behind the scenes and for working late nights to set up the booth.
Australia is not the finish line; rather, it marks another starting point in DMK's journey toward globalization. 🌏

Where should we make our next appearance? Which country would you like to see us visit next?

Skip the Carousel

1 2 3 4 5 6 7 8

2 weeks ago (edited) | [YT] | 3

JallyTalk-Demark Laser

Hello everyone, I'm Jally. Removing varnish from wood surfaces has long been a major challenge in the fields of cultural relic restoration, furniture refinishing, and building maintenance. Laser cleaning of wood paint has also been a very popular topic in the industry. Previously, we conducted many cleaning tests on ordinary oil-based paints, achieving good results and gaining recognition from many users. However, varnish removal remains one of the most difficult challenges. DMK has always taken user needs as its R&D direction, so we have carried out a large number of experiments and made some progress on cleaning wood varnish.

We tested solid-state UV, picosecond UV, and a 300W single-mode pulsed laser respectively. We found that the picosecond UV laser provides the best cleaning effect, but it also has significant limitations. Turning it into a dedicated device would not be commercially viable. First is the cleaning efficiency: cleaning an area of 100mm x 100mm took nearly 10 minutes, extremely inefficient, and the equipment is very expensive. As for the solid-state UV laser, although it causes some discoloration after cleaning, cleaning the same area took only 4 minutes. However, both UV devices can only be configured as fixed workstations, not handheld, resulting in low cost‑effectiveness and inconvenient operation. The fastest is still the 300W handheld pulsed laser, which took less than 1 minute and also produced very good results.

We have identified the optimal configuration for cleaning varnish with existing equipment, A laser cleaning machine specifically designed for varnish is also under development. We have also established the best cleaning parameters for varnish removal. If you have any questions regarding laser cleaning of varnish, or if you need the parameter table, please send me an email – I believe I can help you. For detailed comparative results of the cleaning tests, please see the images below.

Skip the Carousel

1 2 3

3 weeks ago (edited) | [YT] | 5

JallyTalk-Demark Laser

On March 21, 2026, DMK successfully concluded its participation in the Munich Shanghai Photonics Exhibition. At the exhibition, DMK showcased a range of core equipment, including laser mobile cleaning, continuous cleaning, and pulsed cleaning systems, comprehensively covering various industrial application scenarios. The exhibition attracted new customers from China and around the world for consultations and exchanges, and also welcomed many long-term partners for in-depth communication and technical discussions, further validating the stability and reliability of DMK products in practical applications. In the future, DMK will continue to increase its R&D investment in the laser cleaning field, adhering to a customer-centric approach, continuously optimizing products and processes, and striving to create more efficient, stable, and user-friendly industrial-grade laser tools, providing reliable solutions for the global manufacturing industry.

DMK Exhibition Preview for April:
March 30 - April 2, Paris 2026 GLOBALINDUSTRIE
April 15-19, CANTON FAIR THE 139TH
I'm Jally, looking forward to communicating with you face-to-face!

Skip the Carousel

1 2 3 4 5 6

2 months ago | [YT] | 3

JallyTalk-Demark Laser

DMK's appearance at TCT ASIA 2026 was a resounding success. At the exhibition, we showcased several cutting-edge products, including the SLM120 small metal 3D printer, and debuted the Sparkio-1, a three-in-one experimental device integrating 3D printing, internal engraving, and marking. This attracted widespread attention and in-depth exchanges from customers across various industries both domestically and internationally. During the exhibition, the DMK team engaged in high-quality communication with professional users from multiple fields regarding industrial-grade application scenarios, material compatibility, and process implementation. In the future, DMK will continue to increase its R&D investment and technological exploration in the 3D printing field, focusing on practical applications and efficiency improvements, and is committed to creating more stable and user-friendly industrial-grade laser 3D printing tools to provide reliable solutions for the global manufacturing industry.

DMK's April Exhibition Preview:
March 30 - April 2, Paris 2026 GLOBALINDUSTRIE
April 15-19, CANTON FAIR THE 139TH
I'm Jally, looking forward to communicating with you face-to-face!

Skip the Carousel

1 2 3 4 5 6

2 months ago | [YT] | 0

JallyTalk-Demark Laser

Behind every ray of light, there are those who dedicate themselves silently.

Today, we pay tribute to women around the world.

Your gentleness, resilience, and dedication have fueled innovation.

Happy International Women's Day to all women!

From the entire staff of DMK Laser

Skip the Carousel

1 2

2 months ago | [YT] | 0

JallyTalk-Demark Laser

As laser cleaning replaces sandblasting across more industries, one question keeps coming up:
How do we balance cleaning efficiency with surface quality?
Continuous laser cleaning delivers speed and productivity.
Pulsed laser cleaning delivers high cleanliness and surface brightness.
But real industrial applications demand both.
That’s why composite laser cleaning is gaining attention—not as a concept, but as an engineering solution.
At DMK, we’ve spent years validating composite laser cleaning through real-world testing.
By combining continuous and pulsed lasers in a single process, we’ve achieved:
Over 10× efficiency improvement compared to pulsed-only cleaning
Sa2.5 surface cleanliness, suitable for coating preparation
Surface roughness and adhesion performance comparable to sandblasting
Most importantly, this progress didn’t start with a handheld product.
Our approach has always been:
Engineering validation first. Product release second.
In 2026, our R&D focus will shift toward handheld composite laser cleaning systems, currently in the testing phase.
We believe that respecting engineering principles is the only way to deliver laser cleaning solutions that truly work in the field.
👉 Follow us to stay updated on the next stage of composite laser cleaning.

Skip the Carousel

1 2

3 months ago | [YT] | 4

JallyTalk-Demark Laser

Happy New Year! Thank you for your trust and support from our global customers in 2025! We will continue to provide excellent service to our global users in 2026！#DMK laser

5 months ago (edited) | [YT] | 14