Chain Making Welding Machine: Why Water-Cooled Laser Welding Replaces Solder for 22K Gold Chains
Reading time: 8 min | Target keywords: chain making welding machine, water cooled fiber laser welding, chain welding machine for jewelry, Italian chain machine retrofit, 22K gold chain welding, snake chain laser welding, box chain welding
Chain production is the most repetitive job in a jewelry factory. Every link has to be closed, joined and finished to the same standard, thousands of times a day. For decades the industry solved this with solder and a torch — and then paid for it downstream with solder powder contamination, porous joints, dull color and an extra furnace pass.
Water-cooled fiber laser welding takes a different route. Instead of adding filler metal, it melts the two ends of the link itself, joining parent metal to parent metal. For 22K gold chains this is the difference between keeping 22K and quietly sliding to 20K after soldering. This article explains how the MCW water-cooled laser welding system works for chain making, which chain styles it covers, how it retrofits existing Italian chain machines, and what to check before you buy.
Why Solder Powder Is the Real Cost in Chain Making
Solder looks cheap because the powder or paste costs very little per gram. The cost appears elsewhere:
- Purity loss. A soldered joint is not the same alloy as the chain. On 22K gold chain, filler metal pulls the assay of the joint down — in practice a 22K chain can test closer to 20K at the soldered links.
- Post-weld furnace treatment. Soldered chains normally need a heat treatment pass afterwards to restore color and relieve stress, which adds time, energy and handling risk.
- Residue and contamination. Flux and powder residue has to be cleaned out of hollow links, snake chain seams and fine gauge wire. Residue left inside a link shows up later as tarnish or a rejected lot.
- Rework and porosity. Soldered joints can be porous, which weakens tensile strength and produces inconsistent color at the joint under magnification.
Laser welding removes the filler metal from the process. The joint is fused from the chain material itself, so the alloy at the joint stays the alloy of the chain, and no furnace pass is needed afterwards.
How the MCW Water-Cooled Laser Welding System Works
The MCW series is a fiber laser welding system built specifically for chain making stations. Three models are available — MCW-1000, MCW-1500 and MCW-2000, at 1000 W, 1500 W and 2000 W maximum peak power. The design decisions that matter for chain production are these:
Built-in Water Chiller for 24/7 Continuous Operation
Chain production runs in long shifts, and a welding source that derates after two hours is useless. The MCW integrates a true water-cooled fiber laser with a built-in chiller, so the machine holds its parameters through continuous operation instead of throttling back. The dedicated cooling path also protects the laser source and the optics, which is where most long-term downtime originates.
High Beam Quality and Uniform Energy Distribution
Uniform energy distribution across the spot is what produces a clean, consistent weld bead rather than a burned center with an unfused edge. For thin links and fine wire this matters more than raw power: an uneven spot punches through a 0.5 mm link while leaving the seam open on the far side.
Stable Output and Adjustable Spot Size
Spot diameter is adjustable from 0.1 mm to 0.6 mm, and power can be set anywhere from 10% to 100%. That range is what allows one machine to close a heavy curb link and then be dialed down for a delicate gauge wire joint without changing hardware. Stabilization is immediate on startup — there is no warm-up period to wait out before the first weld repeats.
Retrofitting Traditional Italian Chain Machines
Most chain factories are not starting from an empty floor. The MCW system is designed to work with the traditional Italian chain machines already installed in the workshop. Maven supplies a dedicated laser head mounting bracket that mounts the welding head onto the existing chain machine frame, so the old mechanical line keeps doing the forming and indexing work while the laser takes over the joining step.
The retrofit route matters commercially: you keep the capital equipment you already own, keep the operators you already trained, and add laser welding as a station rather than buying a complete new line. Install and use immediately — no rebuild of the forming section is required.
One Machine, Ten Chain Styles
The MCW platform is used across the main chain constructions in production today:
- Ball Chain
- Box Chain
- Curb Chain
- Figaro Chain
- Filled Flat Cable Chain
- Flat Cable Chain
- Gauge Wire
- Rolo Chain
- Rope Chain
- Snake Chain
Because the beam parameters are programmable rather than fixed by a mechanical torch setup, switching chain styles is a parameter change plus a fixture adjustment, not a rebuild. That flexibility is what makes short runs and mixed production schedules viable on the same station.
Materials: Gold, Silver, Copper and Stainless Steel
One machine handles gold, silver, copper and stainless steel. For precious metal work the practical benefit is purity retention: laser welding preserves 22K gold purity at the joint instead of dropping toward 20K as soldered joints do. Welds come out with a brighter finish, and the post-weld furnace treatment that soldered chains require is removed from the flow. For stainless steel and copper, the same system closes links without the discoloration and porosity that soldering leaves behind.
MCW Specifications at a Glance
| Parameter | MCW-1000 | MCW-1500 | MCW-2000 |
|---|---|---|---|
| Maximum peak power | 1000 W | 1500 W | 2000 W |
| Laser wavelength | 1080 nm ± 5 nm | ||
| Pulse width | 0.1 – 10.0 ms | ||
| Operating mode | MCW | ||
| Fiber core | 20 µm / 50 µm / 100 µm | ||
| Fiber output number | 1, QBH interface | ||
| Fiber armor length | 10 m | ||
| Power adjustment range | 10 – 100 % | ||
| Electro-optical efficiency (whole machine) | 30 % (typical value) | ||
| Indicating red light power | 100 µW | ||
| Fiber optic cable bending radius | 200 mm | ||
| Welding spot diameter | 0.1 – 0.6 mm | ||
| Ball type injection head | Collimation FC, 80 mm / Focus FF, 100 mm (optional) | ||
| Laser on time / off time | 100 µs / 100 µs | ||
| Laser operating temperature | 5 °C – 50 °C | ||
| Working environment relative humidity | 20 % – 90 % | ||
| Power requirements | AC 110 – 260 V, 50 / 60 Hz | ||
| Cooling method | Water cooled | ||
| Storage temperature | −10 °C to 60 °C | ||
Standard Configuration and Installation
Each MCW unit ships as a working station, not a bare laser head. The standard configuration includes the MCW laser unit with built-in chiller, AC power cord, ball type injection head, optoelectronic switch, 7-inch touch screen controller, emergency stop (scram) button, 3-color warning light, exit head protection window, dust-free paper and a tool kit.
Installation is a station-level task: position the unit, connect the power and the fiber output to the mounting bracket on the chain machine, set the process parameters for your chain style and wire diameter, and start production. The 7-inch interface stores the parameters per chain style, which is how the station moves between products during a shift.
Frequently Asked Questions
Will laser welding change the color of my gold chain?
No filler metal is added and no flux is used, so the joint is the same alloy as the chain. Welds come out with a brighter finish, and the post-weld furnace treatment normally used after soldering is not required.
Can it be fitted to the Italian chain machine we already have?
Yes. Maven supplies a dedicated laser head mounting bracket for traditional Italian chain machines, so the laser welding station is added to the existing machine rather than replacing it.
How many chain styles can one MCW unit handle?
The standard platform covers ball, box, curb, Figaro, filled flat cable, flat cable, gauge wire, rolo, rope and snake chain, plus others within the same wire diameter range. Style changes are parameter and fixture changes, not hardware rebuilds.
What wire diameter and joint size can it weld?
Spot diameter is adjustable between 0.1 mm and 0.6 mm with power from 10% to 100%, which covers the joint sizes used in fine gauge wire up to heavier flat cable links.
Does it need to warm up before the first good weld?
No. Stabilization is achieved immediately upon startup, so the first weld of the shift repeats the parameters set on the controller.
What is the difference between MCW-1000, MCW-1500 and MCW-2000?
Maximum peak power — 1000 W, 1500 W and 2000 W. The optical parameters, pulse width range, spot size range and cooling design are shared across the series, so the choice is driven by link cross-section and throughput target.
How to Evaluate a Chain Making Welding Machine
When comparing suppliers, ask for the parameters that actually decide whether the station works in your factory:
- Whether it retrofits your existing Italian chain machines, and whether the mounting bracket is included.
- The real duty cycle — whether the chiller holds parameters through a full shift.
- Spot size and power adjustment range, and whether they are set from the controller.
- Which chain styles and wire diameters the supplier has actually run, not just the theoretical range.
- Whether a purity test after welding is offered, particularly on 22K and 18K gold.
- Installation support and parameter recipes for your specific chain style.
- An installed base you can reference in your region — the MCW platform has more than 5,000 units in service worldwide, so parameter recipes for common chain constructions already exist.
The most useful next step is a sample test. Send the chain style and wire diameter you produce, and have the supplier weld it and report the joint result — color, tensile behaviour and assay where relevant — before any purchase decision.
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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