What Is Pulse Arc Welding? How Permanent Jewelry Welders Actually Work
What Is Pulse Arc Welding?
The One-Sentence Explanation
Pulse arc welding is a micro-welding process that uses a controlled burst of electrical energy to create a plasma arc between a tungsten electrode and a metal surface, melting and fusing the metal in milliseconds without the need for flame, solder, or filler material.
For permanent jewelry, this means the two ends of a tiny jump ring — the small circular link that closes your bracelet chain — are melted and fused together by that arc in a fraction of a second. The result is a seamless, nearly invisible join that's as strong as the chain itself.
Why It Is Also Called Micro TIG Welding
Pulse arc welding goes by several names: micro TIG welding, pulse arc welding, and — in jewelry industry marketing — sometimes just "arc welding" or "spot welding." The TIG (Tungsten Inert Gas) name tells you most of what you need to know about the technology: it uses a tungsten electrode, and it uses an inert gas (typically argon) to protect the weld zone from atmospheric contamination during the arc.
The difference from standard TIG welding is scale and delivery. Industrial TIG welding runs continuously — the welder controls a sustained arc with a foot pedal, adding filler wire as needed, working on material from thin sheet to thick structural steel. Pulse arc welding for jewelry fires a single, discrete burst of energy at carefully controlled joule levels, in equipment sized for a jeweller's bench with microscope optics and a handheld stylus rather than a full welding station. Same core physics, very different application scale.
Understanding that pulse arc welding is essentially micro TIG helps demystify why the technology works the way it does and why it has the specific advantages it has for precision metal joining near skin. If you're also curious how this compares to what a full-size industrial laser welder does, our what is permanent jewelry guide covers the broader context of the craft.
How a Pulse Arc Welder Works Step by Step
Watch this demonstration of pulse arc welding for permanent jewelry:
Storing the Energy
The core of a pulse arc welder is a capacitor — an electrical component that stores energy and releases it on demand. When you turn the machine on and select your joule setting, the machine charges the capacitor to the appropriate energy level. This charging typically takes less than a second at lower energy settings, slightly longer at higher joule levels.
The joule setting (covered in more detail below) determines how much energy the capacitor stores for each discharge. On a typical permanent jewelry setting — 14k gold, delicate chain, 1–5mm jump ring — you're using somewhere between 3 and 30 joules, depending on the metal and jump ring diameter.
The Plasma Discharge
When the jeweller touches the tungsten electrode to the metal jump ring and presses the trigger (or foot pedal, depending on the machine), the capacitor discharges its stored energy through the tungsten electrode. The electrical energy ionises the gap between the electrode tip and the metal, creating a plasma arc — a superheated column of ionised gas that conducts electricity and reaches temperatures in excess of 10,000°C.
This plasma arc strikes the metal surface at the contact point. The metal absorbs the energy and reaches its melting point at that microscopic spot. The two sides of the jump ring gap are simultaneously heated, and the molten metal flows together across the gap. When the arc stops — which happens automatically as the capacitor exhausts its stored charge — the metal solidifies in the fused position.
The argon gas flowing through the electrode or the nozzle creates a protective shield around this entire process, preventing oxygen from reacting with the hot metal and causing oxidation, porosity, or discolouration at the weld.
Why the Weld Takes Milliseconds
The entire discharge — from trigger press to solidified weld — takes place in the range of 1 to 10 milliseconds at typical permanent jewelry energy settings. This extremely short duration is not a limitation; it's a fundamental design characteristic that makes pulse arc welding safe and precise for near-skin jewellery work.
Because the energy is deposited so rapidly, the heat cannot spread significantly beyond the immediate contact zone during the weld. The jump ring heats to its melting point; the chain links adjacent to the jump ring, and the skin beneath them, don't receive meaningful heat before the weld is already complete and cooling. This is the physics reason that pulse arc welding can be performed safely centimetres from a client's skin with only a leather guard for protection — the process is simply too fast for heat to travel.
Why Pulse Arc Welding Is Ideal for Permanent Jewelry
No Open Flame
Traditional jewellery soldering uses an open torch flame to heat metal to soldering temperature. Flames are broad-spectrum heat sources — they heat everything in the vicinity, not just the target area. Working with an open flame near a client's skin is neither practical nor safe. Pulse arc welding's electrode-delivered arc is contained, controllable, and pointed precisely at the join, with no radiant heat affecting the surrounding area.
This flame-free characteristic is also why there's no fire risk in a permanent jewellery studio — you're not introducing an open ignition source into a client-facing retail or salon environment.
Precision Without Heat Spread
The precision of pulse arc welding comes from two factors working together: the tungsten electrode focuses the arc to a very small spot (often 0.5–2mm depending on electrode preparation), and the millisecond duration prevents heat from spreading beyond that spot before the weld is complete.
For jewellery work, this means the jeweller can weld a 1mm jump ring shut without affecting the adjacent 1mm chain links. The weld is placed exactly where it needs to be, with no collateral thermal damage to the piece or the client. Sunstone's published product data for their Orion x-Series notes weld spots as small as 0.2mm under microscope conditions — precision that's impossible to replicate with any flame-based process.
Works on Gold, Silver and Platinum
Pulse arc welding joins the precious metals used in permanent jewellery reliably: yellow gold (10k, 14k, 18k), rose gold, white gold, sterling silver, argentium silver, and platinum. Each metal requires different joule settings because they have different melting points and thermal characteristics.
Gold welds at relatively modest energy settings. Sterling silver is a more challenging material for pulse arc welding because silver has high thermal conductivity — it distributes heat quickly, requiring slightly higher peak energy to maintain the arc at the contact point. Platinum welds well but at different settings again. The Sunstone Orion mPulse documentation specifically notes high-frequency agitation mode for difficult metals like palladium, which share silver's conductivity challenge.
The machine's energy range and adjustability are what allow the same welder to handle all of these metals effectively — a wide enough joule range, fine enough adjustment increments, and in advanced machines, additional parameters like agitation for difficult materials.
Safe to Use Near Skin
The combination of millisecond duration, contained arc, and leather protective shield makes pulse arc welding one of the safest procedures performed near skin in any field. The protective leather patch positioned between the client's skin and the jump ring is primarily a precautionary barrier against any tiny spark deflection rather than a shield against meaningful heat — the duration is simply too short for meaningful heat to develop at skin level during a correctly executed weld.
The main safety consideration is eye protection — the plasma arc produces intense light including UV and visible light that can cause eye damage with repeated unprotected exposure. The jeweller wears auto-darkening glasses or uses the microscope's built-in optical shutter system that darkens automatically when the arc fires. For a full guide to safety protocols in permanent jewelry practice, see our permanent jewelry safety guide.
Pulse Arc Welding vs TIG Welding: What Is the Difference?
Continuous vs Pulsed Arc
Standard TIG welding delivers a continuous arc — the welder initiates the arc and then maintains it while moving along the joint, controlling heat input with a foot pedal. This sustained arc approach is suited to joining two pieces along a seam: welding a sheet metal bracket, joining pipe, fabricating a structural component.
Pulse arc welding fires a single discrete pulse per trigger press. Each press = one weld. For permanent jewellery work, each trigger press closes one jump ring. The energy is pre-set and pre-stored in the capacitor; the welder doesn't need to modulate a continuous arc. This makes the process more repeatable and accessible — the energy delivery is controlled by the machine's settings, not by the welder's foot pedal technique.
Scale and Application
Industrial TIG welding equipment is scaled for joining metal from thin sheet (0.5mm) up to thick structural plate. It's a fabrication tool. Pulse arc jewellery welders are scaled for joining components from 0.1mm to a few millimetres — the dimensions of jewellery chain links and jump rings. They include microscope optics or auto-darkening eyewear for close-up working, articulated arms for positioning the stylus, and joule ranges starting as low as 1–3 joules, far below any practical use in fabrication welding.
The shared physics are: tungsten electrode, plasma arc, inert gas shielding. The shared outcome is: metallurgical fusion of metal at the contact point, no filler material required. Everything else — scale, application, equipment, and operation — is different.
Pulse Arc Welding vs Laser Welding for Jewelry
Both pulse arc and laser welding are used in jewellery, and both produce high-quality, solder-free joins. The choice between them depends on application requirements and budget.
Cost Difference
A professional pulse arc welder suitable for permanent jewellery — the Sunstone Orion mPulse range — starts at approximately $1,699 and runs to $6,900+ for the top x-Series models. Jewellery laser welders (Nd:YAG pulsed benchtop systems from LaserStar, Sunstone's own LZR range, or similar) start at approximately $5,000 and run to $15,000+ for professional configurations. For a permanent jewellery business starting out, pulse arc is the accessible entry point.
The equipment cost difference is significant enough that most permanent jewellery artists start with a pulse arc welder and add a laser welder later if the volume and application mix justifies it.
When Laser Welding Makes More Sense
Laser welding's advantages for jewellery: no electrode to maintain and sharpen, the beam can reach into more recessed or awkward positions that an electrode stylus can't access, and for certain metals (particularly reflective ones like silver, where pulse arc requires higher energy settings) laser energy coupling can be more controlled. Laser welding also produces essentially no visible spot at all on correctly executed joins — the weld is effectively invisible even under magnification.
For permanent jewellery's core task — closing a jump ring on a fine chain — pulse arc is technically adequate and considerably more affordable. For high-end jewellery repair, stone setting work, and complex fabrication near gemstones, laser welding's precision and reach advantages become more relevant. For a detailed side-by-side, our pulse arc vs laser welder guide covers the full comparison including application recommendations.
What Are Joules and Why Do They Matter?
Joules (J) are the unit of energy — the same joules used in physics equations, measuring the quantity of work done or energy transferred. In a pulse arc welder, the joule rating tells you how much energy the capacitor stores per discharge, which determines the intensity of the plasma arc and consequently how much metal is melted at the contact point.
The practical significance for permanent jewellery:
- Too few joules: the arc doesn't generate enough heat to fully melt both sides of the jump ring gap. The weld is weak or incomplete.
- Too many joules: the arc melts more metal than needed, potentially burning through a delicate jump ring, leaving excess metal at the weld site, or causing discolouration.
- Correct joules: the gap closes cleanly, the weld is smooth, and no excess material is visible.
The correct joule setting varies by: the metal (gold vs silver vs platinum), the jump ring diameter (larger ring = more material to heat), the jump ring wire thickness, and the gap size at the join. Entry machines like the Sunstone Orion mPulse offer a 1–30 joule range in half-joule increments below 15J. The Orion x-Series 200x offers up to 200 joules in 0.05 joule increments — the fine control at low energy levels being particularly relevant for precision permanent jewellery work.
For the buyers considering which machine provides the right joule range for their work, our best permanent jewelry welders guide covers the full Sunstone range and alternatives with energy specifications.
What Metals Can a Pulse Arc Welder Join?
Pulse arc welders handle all the precious metals used in permanent jewellery:
- 14k yellow, rose, and white gold — the most common permanent jewellery metal; welds at moderate joule settings
- 18k gold — higher gold content, slightly different thermal properties; welds well with appropriate adjustment
- Gold-filled — the base metal layer can affect weld quality; test settings on the specific chain before client appointments
- Sterling silver (92.5% silver) — requires higher joule settings and/or higher argon flow than gold due to silver's high thermal conductivity
- Argentium silver — a silver alloy with added germanium that's more tarnish-resistant; welds comparably to sterling
- Platinum — dense, high melting point metal; requires specific settings; pulse arc capable
Metals that pulse arc welders are less suited for: titanium (requires specialised settings and very high purity argon due to reactivity), copper (high conductivity, difficult to weld), and base metals like brass or stainless steel (possible but not the intended application for jewellery welders).
Do You Need Experience to Use One?
Pulse arc welding for permanent jewellery has a significantly shorter learning curve than TIG welding or traditional jewellery soldering. The machine handles the energy delivery — you set the joules, press the trigger, and the arc fires for the correct duration automatically. You're not manually modulating a sustained arc or managing filler wire simultaneously.
The skills that take practice:
Electrode preparation. The tungsten electrode must be sharpened to a fine point for focused, consistent arcs. A blunt or oxidised tip produces inconsistent results. This is a simple skill — sharpen with a diamond disc or dedicated electrode sharpener — but it matters.
Joule calibration for your materials. Different chains from different suppliers, even nominally the same metal, can behave differently. Test settings on scrap before client appointments and build a reference for your specific chain inventory.
Microscope/viewing system use. Seeing what you're doing at jump ring scale requires the machine's microscope or auto-darkening lens system. Learning to position and weld under magnification takes practice but typically comes within the first few dozen welds.
Most permanent jewellery artists report feeling comfortable with consistent results after 50–100 practice welds on their specific chains. This is faster than learning most other jewellery fabrication techniques.
What Equipment Comes with a Pulse Arc Welder Kit?
A complete permanent jewellery setup includes:
The welder unit itself — the capacitor, control electronics, power supply, and display. Houses the energy storage and discharge circuitry.
Welding stylus and electrode — the handheld pencil-like tool with the tungsten electrode at the tip. The stylus connects to the welder via a flexible cable. Sunstone's Orion stylus has been redesigned in 2024 for improved ergonomics and is available in multiple colours.
Ground clamp — connects to the workpiece (or the jeweller's hand via a conductive wristband) to complete the electrical circuit.
Auto-darkening lens (ADL) or microscope system — the eye protection and viewing system. The Orion ADL automatically darkens when the arc fires; microscope systems provide magnification in addition to protection.
Argon gas setup — regulator and hose to connect to an argon cylinder, or in some setups a small integrated argon mini-tank (Sunstone sells the Argon Mini for pop-up use). Argon is required for quality welds; nitrogen is sometimes used but isn't recommended for precious metals.
Tungsten electrodes — a set of tungsten rods that are sharpened and used as the arc electrode. These are consumables that need replacing and resharpening over time.
Safety guide and documentation — reputable machines from Sunstone come with comprehensive user guides and safety documentation.
Most professional Orion packages also include a starting set of consumables (nozzles, lenses, electrodes) and access to Sunstone's training resources.
Frequently Asked Questions
What is pulse arc welding in simple terms?
Pulse arc welding is a process that stores electrical energy in a capacitor and releases it in a controlled burst through a tungsten electrode. This burst creates a plasma arc — an intensely hot column of ionised gas — that melts and fuses metal at the point of contact in milliseconds. For permanent jewellery, the arc is aimed at the gap in a small jump ring, fusing it shut with no solder, no flame, and no filler material. The entire weld is complete before meaningful heat can spread to the surrounding chain or the client's skin.
Is pulse arc welding the same as TIG welding?
Pulse arc welding uses the same fundamental physics as TIG welding — a tungsten electrode, plasma arc, and inert gas shielding. The difference is scale and delivery. TIG welding delivers a continuous arc controlled by the welder over a seam; pulse arc welding fires a single discrete pulse per trigger press at very low joule levels suited to microscopic jewellery components. Pulse arc welders for jewellery include microscope optics and work at 1–200 joule energy ranges. Industrial TIG welders work in kilowatts and are scaled for fabrication, not micro-scale jewellery joining.
How many joules do I need for permanent jewelry?
For most permanent jewellery applications — 14k gold, standard delicate chain, 1–3mm jump rings — you'll typically use 3–15 joules. Sterling silver generally requires more joule energy than gold due to silver's high thermal conductivity, often 10–25 joules for comparable jump ring sizes. Platinum falls somewhere in the middle. The entry-level Sunstone Orion mPulse covers 1–30 joules; the mPulse PRO covers 1–60 joules. For a service business offering multiple metals and chain types, a machine with a range of at least 1–60 joules provides comfortable working margin.
Do I need argon gas for permanent jewelry welding?
Yes — argon is required for quality permanent jewellery welds. The argon creates an inert shield around the arc that prevents oxygen from reacting with the hot metal and causing oxidation, porosity, or discolouration at the weld site. Welding without argon typically produces a visually obvious, discoloured weld rather than the clean, bright join that professional permanent jewellery requires. For studio work, a standard small argon cylinder with a regulator handles this. For pop-up events and mobile work, Sunstone's Argon Mini is a compact portable argon solution.
How is pulse arc welding different from soldering for jewelry?
Traditional jewellery soldering uses an open torch flame to heat metal to soldering temperature, then adds a solder — a lower-melting filler alloy — to bridge the join. Pulse arc welding uses no flame, no solder, and no filler: the base metal itself is melted and fused directly. The practical differences: pulse arc leaves no colour variation at the join (solders are different alloys with different colours and finishes), there's no flux residue to clean up, there's no fire risk near clients, and the join is the same material as the base metal throughout.
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