How to choose a jewelry laser welder: YAG vs fiber

Choose a jewelry laser welder by its peak power, pulse range, spot size and optics more than its headline joule figure. A pulsed Nd:YAG bench welder with a 0.2–2 mm adjustable spot, a 10× microscope and an argon nozzle covers most repair and small-batch work. Fiber (QCW) sources do the same job with higher efficiency and no flashlamp. For permanent jewelry on a client’s wrist, the usual tool is a pulse-arc welder.

What a jewelry laser welder does well

A jewelry laser fires short, focused pulses. Each pulse melts a small spot, and overlapping spots form a seam. Heat stays close to the joint, which is why jewelers use lasers where a torch would damage a stone or a nearby solder joint.

Common bench jobs:

• Prong retipping and head setting. Gary Dawson’s comparison for AJM Magazine found the laser gave the best access for attaching a four-prong head on a cluster ring and the most positioning options for retipping prongs next to heat-sensitive stones.
• Sizing and clasps. Continuous seams such as dovetail sizing and clasp installation were fastest with the laser in the same test.
• Casting porosity. Laser Focus World lists correction of porosity in castings as a standard use. Matching alloy can be added where metal is missing.
• Chain. Pulsed Nd:YAG lasers weld gold chain links without filler metal. In 2006, more than 3,000 pulsed Nd:YAG lasers were in use for jewelry welding worldwide. On the bench, the same method closes jump rings and repairs links without solder.
• Work near stones and recesses. Glovebox-style chambers let jewelers weld close to stones, and the beam reaches recessed areas you can see through the microscope.

Know the limits too. Dawson notes that many pulses in a row heat the piece quickly, sometimes forcing a pause, and that the laser can partly anneal earring posts near the weld. He also warns that nickel white golds can give brittle laser and pulse-arc welds. Silver and copper alloys reflect more of the beam and conduct heat away fast, so they need more peak power and careful settings.

Pulsed Nd:YAG vs fiber (QCW) sources

Flashlamp-pumped Nd:YAG is the established jewelry laser. A flashlamp pumps a neodymium-doped crystal, which emits at 1064 nm. The Orion LZR benchtop range is a useful reference for the specifications:

Specification	Orion LZR range, entry to top model
Average power	30–100 W
Peak power	3–11 kW
Maximum pulse energy	35–255 J
Pulse length	0.1–12 ms (entry) to 0.1–25 ms
Pulse rate	up to 6 Hz (entry) to up to 40 Hz
Spot diameter	0.2–2 mm, with a 0.1 mm option on some models

The flashlamp is a wear part. Plan for lamp replacement and for the deionized water that cools the lamp and crystal.

Fiber QCW (quasi-continuous wave) lasers pump a doped optical fiber with diodes and emit at about 1070 nm. IPG states that QCW pulses reach up to 10 times the average power, with pulse lengths from 0.05 to 50 ms. When IPG launched its QCW line, it quoted wall-plug efficiency above 30% and maintenance-free operation, with no parts to replace in normal use. IPG also notes that high peak power helps overcome the reflectivity of copper and aluminium, which matters for reflective jewelry alloys too.

Comparison of jewelry welding technologies

Factor	Flashlamp Nd:YAG bench welder	Fiber QCW bench welder	Pulse-arc welder
Energy source	Flashlamp-pumped crystal, 1064 nm	Diode-pumped fiber, ~1070 nm	Tungsten electrode arc in argon
Peak power	3–11 kW in common bench models	Up to 10× average power	Energy set per pulse
Contact with the piece	None	None	Electrode near the joint, piece grounded
Main wear parts	Flashlamp, protective window, water resin or filter	Protective window	Tungsten electrode
Cooling and size	Deionized water loop, desktop cabinet	Air or water by model	Compact bench or portable unit
Typical use	Bench repair, sizing, prongs, porosity	Same jobs, production lines	Permanent jewelry, simple tacks

Pulse energy and peak power

Three numbers describe each pulse: peak power (kW), pulse length (ms) and energy (J). For a flat pulse, energy equals peak power times pulse length. A 3 kW pulse lasting 2 ms carries about 6 J.

Peak power decides whether the metal melts at all, especially on reflective alloys. Pulse length controls how deep the heat goes. Spot size sets the width of each weld.

Average power sets the pace. Average power equals pulse energy times pulse rate. A welder rated at 80 W average can fire 8 J pulses at 10 per second, but it cannot fire its maximum 225 J pulse at the same rate. Do not buy on the maximum joule rating alone. Ask for peak power, pulse length range and average power, and check the pulse rate at the energy you will use.

Most units also offer pulse shaping, which changes how power rises and falls within one pulse. Ask the supplier to show the presets on your alloys.

Spot size

A small spot (0.2–0.3 mm) suits prongs, chain links and fine filigree. A larger spot (0.8–2 mm) spreads energy for seams, sizing and smoothing. Look for a motorized spot adjustment you can change from the control panel. The Orion range adjusts from 0.2 to 2 mm with an optional 0.1 mm micro-spot. The TL Laser 100 adjusts from 0.3 to 3 mm in 0.1 mm steps.

Microscope or CCD camera

You aim the weld through a stereo microscope, a camera, or both.

• Stereo microscope (10×): gives true depth perception, which helps when you place a pulse on a prong tip. Orion uses 10× Leica optics. The TL Laser 100 ships with 10× eyepieces.
• CCD or HD camera: shows the work on a screen with a crosshair. It is easier on the neck over a long day and lets others watch. Orion’s camera models have HDMI output for live viewing and teaching.

Check how the optics protect your eyes. The TL Laser 100 has an LCD shutter in the viewing path to block the flash during each pulse.

Desktop integrated or split units

Integrated desktop units put the laser, power supply, cooling and work chamber in one cabinet. The TL Laser 100 measures 510 × 295 × 420 mm and draws up to 2 kW at 220 V. Most of Orion’s benchtop models have a footprint of about 714 × 551 × 551 mm (28.1 × 21.7 × 21.7 in). Units like these suit a repair bench or a small shop.

Split units separate the laser source or chiller from the work chamber. They take more floor space. In return they can house a larger source and cooling system and a bigger chamber. Consider them for production work or large pieces.

Water or air cooling

Flashlamp YAG welders put a lot of heat into the lamp and crystal. Orion’s range uses a deionized water system. Read “air-cooled” specifications carefully. The TL Laser 100 lists air cooling, yet its manual has you fill an internal water tank with purified water. Its fans cool that water, so it needs no separate chiller. Fiber QCW modules come in air-cooled and water-cooled versions, depending on model.

Argon shielding

Argon keeps oxygen away from the hot weld spot, which reduces oxidation and discoloration. It is essential for titanium. Most bench welders have an argon nozzle in the chamber. The TL Laser 100 adds a pre-gas setting so argon flows before the laser fires, for oxide-free welds on metals such as titanium.

Permanent jewelry welders vs bench welders

Permanent jewelry means closing a chain or bracelet on the client’s wrist or ankle. Sunstone describes the permanent jewelry welder as a pulse-arc micro welder that melts both ends of the open link in a few milliseconds. The client’s skin is close to the weld, so Sunstone recommends a leather swatch under the chain. Operators should wear an auto-darkening lens or safety glasses against UV light, and clients should wear protective glasses or watch on a screen.

A bench laser is built for the opposite setup: the piece goes into an enclosed chamber and you watch through filtered optics. If a supplier offers you an open-beam laser for permanent jewelry, treat it as a Class 4 laser near a client’s eyes and skin. Ask for its laser class, interlocks, and the eyewear needed for both you and the client.

Laser safety

OSHA describes Class 4 lasers as hazardous to view directly or by diffuse reflection, and as a skin and fire hazard. Nd:YAG light at 1064 nm is invisible near-infrared and can cause retinal burns. A high-power laser fully enclosed in a protective housing with labels and interlocks can meet Class 1 requirements. Bench jewelry welders reduce exposure the same way, with an enclosed chamber and filtered or shuttered optics. Check the laser class on the label and follow the maker’s rules. Service work that opens the housing exposes you to the Class 4 hazard inside. Also fit fume extraction, because welding vaporizes small amounts of metal. See our handheld laser safety guide for more on laser classes and eyewear.

How to decide

1. List your main metals and jobs: gold, platinum, silver, titanium; prongs, sizing, porosity, chain.
2. Check peak power, pulse length range and average power against your heaviest work.
3. Confirm a motorized spot range that reaches 0.2–0.3 mm.
4. Pick microscope, camera, or both, and check the eye-protection shutter or filter.
5. Choose integrated or split by bench space and piece size.
6. Ask what “air-cooled” means on that model, and how the lamp or source is serviced.
7. Confirm the argon nozzle and gas timing.
8. For permanent jewelry, buy a purpose-built pulse-arc welder.
9. Test your own pieces before you buy.

Maxwave started in 2009 with laser power supplies and jewelry laser welding, and builds jewelry YAG/pulsed welders from 60 to 200 W; see laser welding machines. To check settings on your own alloys, send pieces through sample testing for a test video and the parameters used.