Built for Jewelry Repair Benches

Precision Ring Resizing with Laser Welding Technology

A laser welder lets your bench take resizing work in-house — plain bands, stone-set rings, platinum, titanium and mixed alloys. Heat stays confined to the joint, so there is far less to correct afterwards than a torch leaves behind. Whether a specific stone-set piece can be welded in place is judged piece by piece.

Test It on Your Own Ring See How It Works
Standard · Stone-Set
Advanced Resizing
No Filler
Alloy Introduced
In-House
Bench Work
Laser welding ring resizing process
Compatible Metals

What Rings Can Be Resized

The metal decides how the joint behaves and what the machine has to hold steady. This is what each one actually asks of the bench — including the one that is usually a no.

Polished yellow gold sample barGold — 14K / 18K, yellow, white and rose
Polished sterling silver sample barSterling silver
Polished platinum sample barPlatinum & palladium
MetalWhat makes it awkwardWhat that asks of the machine
Gold 14K / 18K
Routine		 The everyday case. The complication is colour rather than the weld — yellow, white and rose each want their own filler so the seam does not read as a different metal after polishing. Matching filler wire per colour, and stored parameters so you are not re-dialling between a yellow band and a white one.
Sterling silver
Needs care		 Silver carries heat away from the joint faster than gold does, so energy that would be right on a gold band can arrive at the seam already spent. Enough energy in reserve at the working spot size, and the patience to test on an offcut before the customer's ring.
Platinum
Routine		 Melts far hotter than gold and stays where it is put, which makes the joint clean but leaves no margin for an underpowered pulse. A usable pulse energy range at the top end — this is the metal that exposes a machine bought purely on price.
Palladium
Routine		 A white metal that behaves broadly like platinum on the bench, and welds to itself without the colour-matching problem white gold brings. Much the same brief as platinum. Worth confirming the alloy, as palladium is sold in several.
Titanium
Needs care		 Reactive while hot — it will pick up oxygen from the air at the weld and go brittle or discoloured if the pool is left exposed. Shielding gas at the joint, and settings proven on scrap first. A torch gives no usable joint here at all, which is why these rings get refused elsewhere.
Tungsten carbide
Not resized		 Not a weldable metal in the bench sense — it is a hard, brittle sintered material. It does not take a weld and it cracks rather than moves. Nothing, and we would rather say so. These rings are exchanged or cut off in an emergency, not resized. Any supplier telling you otherwise is selling you a disappointment.
Two-tone & mixed
Needs care		 Two alloys meet at one seam, and they do not respond to the same pulse. One setting will not serve both sides of the joint. Fine parameter control and the ability to change settings mid-job — the reason two-tone work sits above plain bands when choosing a tier.

Alloys sold under the same name vary between suppliers. Where a ring is unmarked or reclaimed, a test weld on an offcut settles it faster than a specification sheet does.

The Two Jobs

Sizing Up vs. Sizing Down

They look like one job on a worksheet and behave like two at the bench. What separates them is whether metal has to be added or taken away — and that is what decides which machine handles both comfortably.

Two gold bands side by side on grey suede, one noticeably wider in diameter than the other

Sizing up — metal has to be added

The shank is opened and a piece of matching stock is fused in. The joint has to fill a gap rather than simply close one, so this is the direction that leans on pulse energy and on the operator's control of how much material melts at once. Beyond roughly two or three sizes, adding stock stops being an adjustment and becomes a rebuild worth quoting separately.

Sizing down — metal has to come out

A section is removed and the two ends are brought together and fused. There is no gap to bridge and no filler introduced, so the seam is a fusion of the parent metal. The demand shifts from energy to precision: the ends have to meet cleanly before anything is welded.

What both share

Heat stays local to the joint instead of travelling through the shank, which is what keeps the rest of the ring — and anything set into it — out of the process. That is the difference from a torch, and it is the reason this work can sit on a bench rather than go out.

Before You Quote It

How Far Can a Ring Actually Be Sized?

The distance asked for changes what the job is — and at some point it stops being a resize. Read across before you price the work.

Routine
Up to 1 size

Either direction, on most plain and lightly set bands. One seam, minimal reshaping, and the proportions of the ring are unchanged. This is the bread-and-butter job a laser makes quick enough to keep in house.

Assess first
1 – 2 sizes

Still one seam, but the shank thins noticeably going up and the pattern or engraving starts to distort going down. Stone-set pieces need the setting checked for distortion, not just the joint.

Quote separately
Beyond 2 sizes

Adding this much stock is a shank rebuild, not an adjustment, and removing it can throw a patterned or channel-set band out of proportion. Worth pricing as its own job — and worth telling the customer why.

Gold band seated on a steel ring mandrel beside a set of steel ring sizing gauges

What actually limits it

Not the welder. The limits are the wall thickness left in the shank, whether a pattern or channel runs round the band, and how much the setting can tolerate being moved. A machine that welds cleanly does not make a ring that has run out of metal safe to wear.

Why it matters at the counter

Owning the machine means this assessment happens with the customer in front of you, not after the piece has travelled to a trade bench and come back with a question attached.

At the Bench

Anatomy of a Laser Resize

Four stages, and the one that decides the result is not the welding.

Yellow gold ring shank sawn open on a bench pin with the cut ends slightly apart
1
Open or shorten

The shank is cut at the bottom. Going up, stock is prepared to fill the gap; going down, a measured section comes out.

Gold band on a steel mandrel being checked against ring gauges
2
Bring it true

The band is worked back to round on a mandrel and the two faces brought to meet cleanly. This is the stage that decides the seam — a laser cannot close a gap that was never aligned.

Laser weld flash at the joint of a gold ring shank held in tweezers
3
Weld the joint

Pulses are placed along the seam under magnification. Heat stays at the joint rather than travelling round the band, which is what keeps a set stone out of the process.

Close-up of a polished gold band surface finish
4
Finish back

File, emery and polish the joint back into the band. With no lower-melting solder in the seam there is no second colour to blend out.

What Changes at the Bench

What a Torch Forces, and What a Laser Changes

Same job, two different sets of constraints. Read the columns against each other rather than down.

What a torch forces

  • The whole shank is brought up to temperature to get one joint hot enough, so heat reaches whatever is set into the band.
  • Stones near the joint come out first and go back after — two operations added before any joining happens.
  • The seam is solder: a different alloy, a different colour, and a lower melting point than the ring around it.
  • Broad heating leaves oxidation across the piece, so pickling and re-polishing follow every joint.
  • The ring is set aside between stages, so one resize occupies the bench across a day rather than a sitting.
  • Titanium gives no usable joint at all, so those rings get refused or sent away.

What a laser changes

  • Energy is placed at the weld point instead of travelling through the shank, so the rest of the band stays far less exposed.
  • Stones set away from the joint can often stay in place — judged piece by piece on stone, treatment and distance.
  • The seam is the parent metal fused to itself, so there is no second alloy sitting in the shank.
  • Localised energy leaves far less oxidation, so there is much less of the ring to put back together afterwards.
  • No pickling and no soldering block, so a ring moves through in one sitting.
  • Titanium becomes workable with shielding — in practice this is laser-only work.

Most benches keep both. A torch is still faster and cheaper on large joins with no stones and no setting nearby.

Close-up of a claw-set solitaire ring on grey suede, setting and shank both visible
The Job Most Shops Send Out

Resizing Stone-Set Rings

This is the work that usually leaves the building, and it is the work a laser changes most. Heat is confined to a microscopic weld point rather than travelling through the shank, so stones set away from the joint can often stay where they are.

Often — not always. Whether a specific piece can be welded with the stone in place depends on the stone type, any treatment it has had, the setting style, and how far it sits from the weld. That judgement is made piece by piece at the bench, which is exactly why owning the machine matters: you can assess it in front of the customer instead of quoting blind.

What makes it workable

A small controllable spot, microscope-guided positioning, and heat that does not conduct along the band. Those three together are what separates a machine you can take stone-set work on from one you cannot.

See stone-set repair in detail
The Difference

Laser Welding vs. Traditional Soldering

See why more jewelers and customers are switching to laser welding for ring resizing.

At the resizing bench Laser welding Torch soldering
Stones near the joint Often stay set — judged per piece on stone, treatment and distance Usually unset first and reset after
Where the heat goes Stays at the weld point Travels through the whole shank
What fills the seam Parent metal fused to itself Solder — a different alloy and colour
Finishing after the joint No pickling; polish the seam back Pickle, remove firescale, re-polish
Titanium Workable with shielding gas No usable joint
Tungsten carbide Not resized either way Not resized either way
Where the torch still wins Slower to set up per joint on bulk work Large joins with no stones and no setting nearby
What Goes Wrong

Common Ring Resizing Problems

These are the reasons resizing gets sent out, and what changes when the joint is made with a laser instead of a torch.

Torch problem
A seam that keeps showing

Solder is a different alloy with a different colour and a lower melting point, so the join catches the light no matter how it is finished. A laser fuses the parent metal, so there is no second alloy to show.

Torch problem
Heat reaching the stones

A torch heats the whole shank to get one joint hot enough. That is why stones come out first — and why the job takes two extra stages before any welding happens.

Torch problem
Firescale and re-finishing

Broad heating leaves oxidation across the piece, so pickling and re-polishing follow every joint. Localized energy leaves far less of the ring to put back together.

Material limit
Titanium — and the tungsten question

Torch soldering gives no usable joint on titanium, so those rings get refused or sent away; with shielding gas a laser makes them workable. Tungsten carbide is a different answer — it is not resized by either method, and saying so early saves a conversation later.

Material limit
Mixed alloys and two-tone

Two metals meeting at one joint need tighter parameter control than a single alloy does — one set of settings will not serve both sides of the seam.

Casting fault
Porosity opening up at the shank

Sizing sometimes exposes voids that were already in the casting. Filling them is its own job — and one the same machine handles.

See porosity and crack repair

Buying For This Job

What to Look for in a Ring-Resizing Laser Welder

Resizing is a narrower brief than "jewellery welding" in general. These are the specifications that decide whether the job is comfortable, listed as what each one changes at the bench rather than as a number to compare.

Read the full buying guide
Smallest controllable spot
A shank seam sits close to a setting. The spot size decides how near you can place energy before the stone becomes the limiting factor.
Pulse energy range
Sizing up means melting added stock. Too little and the fill is incomplete; the useful range matters more than the peak figure.
Microscope clarity
You are aiming at a joint under a millimetre wide. What you can see limits precision as much as the laser does.
Working chamber
A ring on a mandrel needs room and an angle of approach — a chamber that suits flat work may not suit a band.
Parameter storage
Yellow gold, white gold, silver and platinum each want their own settings. Recalling a proven one beats re-dialling it per job.
Cooling stability
A resizing bench does the same job repeatedly. What the machine holds over a session matters more than what it peaks at.

Request a Free Ring Resizing Test

Send a ring you would normally send out — a plain band, a stone-set piece, a titanium one — and see the joint before you decide anything. The test weld itself is free, the piece comes back to you, and there is no obligation attached to it.

If sending a piece is awkward, photographs of the ring and the joint are enough for a first assessment.

Request a Free Welding Test Send your ring photos
Got Questions?

Frequently Asked Questions

The difference that matters at a jewellery bench is not raw power but how small and how controlled the spot is, and how clearly you can see the joint while positioning it. A shank seam sits millimetres from a setting, so spot size, pulse width and microscope visibility decide whether the job is comfortable or fraught.

Often, yes — heat stays confined to a microscopic weld point, so stones set away from the joint can frequently stay in place. It is judged piece by piece rather than promised: stone type, any treatment it has had, the setting style and how close the stone sits to the weld all decide it.

Most rings can be resized up to two or three sizes in either direction. Larger adjustments usually mean adding or removing metal from the shank rather than simply stretching or compressing it, which is a different job and worth quoting as one.

A laser joint is a fusion of the parent metal rather than a bridge of lower-melting solder, so there is no separate alloy line to catch the light and far less to blend at the polishing stage than a torch seam leaves. How close it comes to disappearing depends on the alloy, the finish and the operator.

They are two different answers. Titanium is laser-only in practice — torch soldering gives no usable joint on it — and it needs shielding gas at the weld so the hot metal does not pick up oxygen and go brittle. Tungsten carbide is not resized at all: it is a hard, brittle sintered material that cracks rather than moves, so those rings are exchanged or cut off rather than sized. If your bench regularly sees titanium, platinum or mixed-alloy designs, that pushes the specification toward tighter parameter control rather than toward more wattage.

No. Training is included with the machine and the starter course is built for complete beginners — machine fundamentals, safety, then basic technique — before anyone works on a customer's ring.