Laser Automatic Welding Machine for Jewelry: LWJ-150Y and LWJ-150F Buyer's Guide
Reading time: 6 min | Target keywords: laser automatic welding machine, jewelry laser welding machine, automatic chain buckle welding, YAG laser welding, fiber laser welding machine for jewelry
Batch-producing chain buckles, pendants, and lock bags means welding the same small precious-metal joints thousands of times, and manual laser welding struggles to keep pace without sacrificing consistency. A laser automatic welding machine solves this by locating the weld seam automatically and repeating the weld path with ±0.005 mm repeatability. This guide explains how the LWJ series works, what it can weld, how the YAG version (LWJ-150Y) differs from the fiber version (LWJ-150F), and the full equipment parameters to check before ordering.
What Is a Laser Automatic Welding Machine and How Does It Work?
The LWJ series laser automatic welding machine is built on precision laser welding technology and combines machine vision with intelligent motion control. Developed over two years and validated through more than 10,000 test welds, the system is designed for one purpose: automated batch welding of jewelry components.
In operation, a self-developed AI algorithm quickly captures the product contour directly from the camera image. There is no complex modeling and no path programming — the system precisely locates the laser point and the welding track, and one key press starts fully automatic welding. The operator's job reduces to loading and unloading parts in the fixture, which keeps the entire cycle short even for irregular-shaped products.
Which Jewelry Products and Metals Does It Handle?
The equipment is designed specifically for the jewelry industry. It performs precision fusion welding of precious metals including 18K–24K gold, platinum, and silver, and supports batch processing and production of products such as chain buckles, pendants, and lock bags.
Because positioning is vision-based rather than fixture-dependent, the machine adapts to products with irregular edges — the algorithm locates the weld position on each part as it arrives. Finished pieces in the reference process flow measure 7–9 mm, which is typical for chain buckle and clasp components.
YAG or Fiber Laser: Which Version Should You Choose?
The LWJ series comes in two configurations. Both share the same 1064 nm wavelength, 150 W maximum output power, 0.02 mm positioning accuracy, and ±0.005 mm repetitive positioning accuracy, but the pulse characteristics and infrastructure requirements differ:
- LWJ-150Y (YAG laser): maximum pulse energy of 60 J with a 0–20 ms pulse width and 0–500 Hz frequency. The higher single-pulse energy suits deeper fusion welds on thicker gold sections. It uses water cooling with a 65 kg chiller (460×660×900 mm), draws 7 kW, and the host weighs 350 kg.
- LWJ-150F (fiber laser): maximum pulse energy of 15 J with a 0.05–50 ms pulse width and 0–50 Hz frequency, air cooling, 2 kW power consumption, and a 300 kg host. It is the lighter, lower-infrastructure option for fine jewelry work.
Match the choice to your typical material thickness and available floor utilities: if you need higher pulse energy for heavier sections, choose the YAG version; if you want minimal cooling infrastructure and lower power draw, choose the fiber version.
How Does the Automatic Positioning System Work?
Three elements work together. First, the vision system captures the product image and the AI algorithm extracts the product contour — no CAD model of the part is required. Second, the system maps the weld track onto that contour and precisely positions the laser point, which keeps seam placement consistent from piece to piece. Third, the workbench runs on an independent intellectual-property intelligent welding CNC system with 0.02 mm positioning accuracy and ±0.005 mm repetitive positioning accuracy, so the weld repeats identically across the batch.
What Results Can You Expect in Batch Production?
- High automation: automatic seam location and one-key operation adapt to products with any edge shape.
- Fast processing: load into the fixture, weld, unload — the whole cycle is short, which raises throughput on repetitive parts.
- Good weld quality: smooth, even seams with a clean surface finish that reduces hand finishing time.
- Strong overall economics: no professional welding programmer is needed for changeovers, which saves labor cost and improves overall benefit across mixed-product runs.
- Room to expand: the intelligent, function-rich platform helps you develop and scale production of new custom products quickly.
How Is It Integrated into the Production Flow?
The reference process has four steps: load the part into the dedicated fixture, run welding process 1 (seam location and first-pass fusion), run welding process 2 (completing the joint), and unload the finished piece (7–9 mm in the reference sample). Fixture-based loading keeps every part in a known orientation, which is what allows the vision system to find the seam immediately without operator alignment.
LWJ Series Specifications at a Glance
| Item | LWJ-150Y (YAG) | LWJ-150F (Fiber) |
|---|---|---|
| Laser type | YAG laser | Fiber laser |
| Laser wavelength | 1064 nm | 1064 nm |
| Maximum laser output power | 150 W | 150 W |
| Maximum laser pulse energy | 60 J | 15 J |
| Pulse width | 0–20 ms | 0.05–50 ms |
| Pulse frequency | 0–500 Hz | 0–50 Hz |
| Workbench CNC system | Independent intellectual property intelligent welding system | |
| Positioning accuracy | 0.02 mm | 0.02 mm |
| Repetitive positioning accuracy | ±0.005 mm | ±0.005 mm |
| Electricity demand | 220V / 50Hz / 60A | 220V / 50Hz / 60A |
| Host power consumption | 7 kW | 2 kW |
| Host weight | 350 kg | 300 kg |
| Overall dimensions of host | 1300×750×1350 mm | 1300×750×1350 mm |
| Cooling method | Water cooling | Air cooling |
| Chiller weight / dimensions | 65 kg / 460×660×900 mm | — (not required) |
| Working environment | 0–40 ℃, humidity <80% non-condensing | |
Standard Configuration and Installation
Each machine ships with the laser welding host, the integrated vision system and intelligent welding CNC workbench, dedicated loading fixtures, and — on the LWJ-150Y — the matching water chiller. Installation needs a 220V / 50Hz / 60A supply, a room held between 0 and 40 ℃ with humidity below 80% (non-condensing), and, for the YAG version, space for the 460×660×900 mm chiller alongside the 1300×750×1350 mm host. After power-up and a short calibration of the vision positioning, the workflow is: fixture the part, one-key start, unload the finished piece. Because there is no path programming, new product introduction mainly means making or adjusting a fixture.
Frequently Asked Questions
Q1: Do I need to program weld paths for each new product?
A: No. The self-developed AI algorithm captures the product contour automatically and locates the laser point and welding track on its own — no complex modeling or path programming is required.
Q2: Which metals can it weld?
A: Precious metals used in jewelry, including 18K–24K gold, platinum, and silver.
Q3: What products is it designed for?
A: Batch processing and production of chain buckles, pendants, lock bags, and similar jewelry components, including pieces with irregular-shaped edges.
Q4: How repeatable is the weld position?
A: The workbench offers 0.02 mm positioning accuracy and ±0.005 mm repetitive positioning accuracy under the intelligent welding CNC system.
Q5: What is the difference between the YAG and fiber versions?
A: Both are 150 W / 1064 nm machines with the same positioning accuracy. The YAG version (LWJ-150Y) delivers up to 60 J pulse energy with water cooling and 7 kW consumption; the fiber version (LWJ-150F) delivers up to 15 J with air cooling and 2 kW consumption.
Q6: Can operators without welding programming experience run it?
A: Yes. Operation is one-key automatic after fixturing, and changeovers between products do not require professional debugging, which reduces the skill level needed on the line.
How to Evaluate Whether the LWJ Series Fits Your Production
Before ordering, work through this checklist:
- Product range: confirm your parts (chain buckles, pendants, lock bags, similar components) can be held in a fixture and present the seam to the camera.
- Material and section thickness: heavier gold sections favor the 60 J YAG version; fine work favors the air-cooled fiber version.
- Utilities: 220V / 50Hz / 60A power for both models, plus chiller space and 7 kW draw for the YAG version versus 2 kW for the fiber version.
- Batch size: the automation pays off on repetitive batches; single-piece custom work gains less.
- Expansion plans: if you plan to introduce new custom products frequently, the vision-based changeover (new fixture, no reprogramming) is a key advantage.
The fastest way to verify is a live test: send us your drawings or sample parts, and the application team will run trial welds and share the results and parameters with you.
About the Author
This guide was prepared by the application team at Shenzhen Mavenlaser Automation Co., Ltd. (Mavenlaser). We specialize in jewelry laser welders, laser marking machines, jewelry laser cutters, automatic chain welding machines, and clasp bending & welding equipment. Visit www.mavenlazer.com or contact us at +86 150 1407 6831 to discuss your project or request sample processing.
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