Logo Lampert


Developed by goldsmiths for goldsmiths.

Weld on findings, loops and wires, easily add metal, weld adjacent to stones, weld silver, attach workpieces prior to soldering and much more – all no problem with the PUK ®.

Also ideal for welding in the immediate vicinity of heat-sensitive areas.




The original Lampert fine-welding system

  • Superior welding characteristics
  • Consistently reproducible and high quality welding results on all materials suitable for welding
  • Simple and intuitive to operate
  • Precise positioning of the welding points


  • Very low, controllable development of heat
  • Welding of even the thinnest materials
  • Makes for easier and faster repairs and soldering
  • Precise welding under the eye protecting system


  • Maintenance-free technology
  • Low procurement costs, extremely good price/performance ratio
  • Compact size – fits into every workshop
  • Very low costs of consumer materials
  • Low argon consumption




Facts that speak for themselves

  • Intuitive to operate
  • Thanks to intelligent presettings, only 3 operating steps are necessary. Select metal group, welding power and welding time
    > weld!
  • Ergonomic work: Individually set work position for fatigue-free work.
  • Premium craftsmanship in every detail
  • Dust-proof housing without a ventilator and means it's quiet and long-lasting.
  • Precision handpiece for precision welds
  • Solid quality and the best materials such as stainless steel and Teflon are prerequisites for precision in manufacturing and reliability in application
  • Handling the components: Sophisticated details simplify handling.
  • Premium plug connections
  • Professional screw and plug connections provide long service life and permanent safety in daily use
  • Practical and fast: Plug-in nozzles and nuts allow you to quickly change electrodes without tools.
  • Special electrodes without poisonous components. With optimal ignition and welding properties

C140 makes welding simple

The operating concept of the C140 guarantees intuitive and safe setting of the device.

Correctly set the device in three steps:

  • 1. Select metal group
  • 2. Adjust the power
  • 3. Adjust welding time according to individual need
    > weld!

Quality and safety come first

Quality for your requirement: We place great value on the highest production and safety standards and guarantee the reliability of our products

  • Quality for high demands:
    We value the highest production and quality standards, are in close contact with our partners and suppliers and know about the reliability of our devices: Therefore, we stand with conviction behind our products – made in Germany!
  • User safety
    in the first place:

    For Lampert the PUK welding eye protection systems have been tested and approved by DIN CERTCO.
  • Tested device safety:
    Safety is paramount at Lampert. All our machines and devices are CE certified according to DIN standards. Thus, our customers can always rely on the safety and reliability of our products.

Automatic operation or foot switch

Difficult workpiece constructions can make manual welding control necessary.

  • Activate the foot switch by pressing it down for 3 seconds. The automatic function of the C140 is then deactivated.
  • The white symbol on the display signals that foot switch operation is activated.


  • Welding is then only triggered when you press the foot switch.


Select your basic settings

Settings menu just a keystroke away

  • To set the gas flow rate, the gas valve can be opened.
  • To control the eye protection, this can be activated in intervals.
  • Activate the optionally available absorber when needed.

At home in the metal workshop

Meaningful construction for long service life and continuous operation:

  • Passively cooled
    The C140 does not need a ventilator or ventilation slots. The passive cooling system generates no disruptive noises and is very energy-efficient.


  • Dust-tight housing
    The C140 features a closed, tight housing.

    Thus none of the metal or polishing dusts generated in the workshop penetrate the device. Damage or device errors caused by unavoidable deposits are avoided.

Are you interested in professional silver welding?


Then visit Jeffrey Herman's fantastic PUK blog!

Accessories and special equipment

Additional practical system components and accessories such as different eye-protection systems, welding smoke absorber, welding wires and much more are available to meet your individual needs. Visit our accessories page.

Technical data




  • Technical data C140



Power (WIG) min./max.
Pulse duration (WIG) min./max.
Max. charging time
Number of metal programs
High-frequency welds
Automatic gas pre-flow time

Gas consumption
Shielding gas


Power consumption during welding
Power consumption in maintenance operation


9 - 430 A

0,5 - 20 ms

0.8 s




ca. 2 l/min

Argon > 99.9 %

e.g. Argon 4.6

400 VA

6 W

6.8 kg

  • Technical data eye protection system



Actively controlled LCD eye protection system

Safety DIN CERTCO-certified
Brightness level of the LCD
Darkness level of the LCD
Switching time
UV protection
IR protection




DIN 11

< 50 ms

> UV11

> IR11




C140 scope of delivery

The C140 welding system is delivered with the following accessories and contains all necessary documentation and instructions.

  • The PUK welding system with the selected eye-protection system
  • Operating manual
  • The necessary contact clamp, gas hose, cleaning brush and connection cables
  • 2 special electrodes each Ø 0.5 mm and Ø 0.6 mm incl. 1 diamond grinding wheel


Here you can find additional information on our welding units available for download


Dean Irvine

Artisan Jeweller
West Kempsey, Australia

Lampert PUK a must for every Jeweller




read more 

Lampert PUK a must for every Jeweller


I invested in a PUK 5 welder and was able to obtain a pay back within 6 Months. The PUK enables me to do additional repair and restoration of jewellery over traditional flame soldering methods through less heat dispersion, pinpoint control and seamless joints. I selected the PUK 5 over other welders for its quality, support service, no maintenance requirements and end welding results.

Gregory J. Lafford

Ballyfin, Ireland

The PUK proves itself invaluable – no matter the metal or alloy.



read more 

I have used various models of the PUK over the past 15 years and currently have a PUK5 at my bench. I have yet to find a more versatile machine for a jeweller’s workshop. Only imagination limits application where the PUK is involved. Whether its mounting, repair work, stone setting, engraving, or otherwise, the PUK proves itself invaluable – no matter the metal or alloy.


Sceptical? Drop by my workshop and see for yourself.

Min-Ling Hsieh

Taipei, Taiwan

I must say that nowadays working without PUK is unthinkable for me!



read more 

I made first experience with a PUK back in 2003 in State Drawing Academy Hanau. It was the PUK111 and I instantly fell in love with it.

With PUK’s help I can realize any of my ideas. It makes welding of different metals and combining them with different materials a lot easier. Especially since I often use very thin metal sheets and wires, the PUK is the perfect tool for me.

I had different PUK models in my workshop already – the PUK 3s, PUK 04 and now the PUK5 – and every new model has offered an increased accuracy and improved welding results.

That is why the PUK has become one of the most important pieces of equipment in my workshop.

I must say that nowadays working without PUK is unthinkable for me!

Luca Cristino

Germagnano, Italy

I think every goldsmith workshop needs a PUK to speed up the jewellery repairs and production.



read more 

You may take anything but my PUK from me!!!

I use it for everything made of gold, silver, steel, titanium and platinum.
I work easily on claws without having to remove the stones before.

The PUK is perfect for fixing the parts prior to soldering, for different micro repairs and also allows me to work on watches (crowns, shafts, gears and bracelets).

My PUK is a PUK3s professional plus and since I bought it, it paid for itself within the first six months already.

I think every goldsmith workshop needs a PUK to speed up the jewellery repairs and production.

Mark Sansom

Birmingham, United Kingdom

I regard the PUK as an essential tool for manufacturing and repairing jewellery and can't imagine working without it.


read more 

Doing jewellery repairs, the ability to add small areas of metal is vital and was missing for the first 25 years of my time as a jeweller.
Then I heard about the welders that were becoming available so I bought a Lampert PUK3S and several years later I am still using it for most of the repairs that I do.
It paid for itself in the first year because it saves me so much time.
It opens up new possibilities such as repairing bracelets without having to refinish them all over, retipping stones like emeralds without removing them, tacking things together before soldering, repairing porosity etc. In most cases it's faster and cleaner than soldering.

I regard it as an essential tool for manufacturing and repairing jewellery and can't imagine working without it.

Lee Molseed

Kingsbridge/Devon, United Kingdom

The PUK has saved me so much more time allowing me to do more work in a day improving productivity. No goldsmith should be without one.


read more 

I have been a goldsmith for 10 years now.
I was taught the old fashion way by a master craftsman from the Birmingham jewellery quarter
Now with this fantastic new PUK I have moved away from using a naked flame and I mainly use my PUK for most of my repairs, its faster, cleaner and when working on some delicate stones such as opal or emerald, the repair is always safe.
It has also saved me so much more time allowing me to do more work in a day improving productivity.
No goldsmith should be without one.

Gabby Williamson

Dental Technician, Toowoomba (QLD), Australia

Orthodontic soldering is now a thing of the past. The possibilities are endless with the PUK D2 TIG welder, many jobs were not possible when I was limited to soldering.

read more 

Orthodontic soldering is now a thing of the past. TIG welding is far superior in every way. The possibilities are endless with the PUK D2 TIG welder. Preparation is minimal and joins are stronger and smoother than soldering.


Since I have been using the PUK D2 I have not had any appliance breakages. Many jobs were not possible when I was limited to soldering. Now I can add small attachments to my appliances with little distortion from overheating. Intricate designs are easily and quickly added to any job with minimal preparation. Almost no finishing and polishing is needed saving much time and money. Working under the microscope makes welding much more precise.


Not only is this PUK D2 excellent, the Lampert ambassadors are also very helpful. I had many conversations with them and they were more than happy to help. They always urged me to keep in touch as they want everyone to appreciate this machine as much as they do.

David Fried

Multidisciplinary artist, New York / Düsseldorf

PUK not only solved many of the problems for the specific artworks in mind, it opened the door to many new ideas that are now possible!


read more 

"You know how some of your best ideas border on the actual doable technology? As a multidisciplinary artist, my various visions often look beyond that technical border. In many cases I must invent the tools necessary, and pursue with considerable improvisation and limitations over years. In 2013, I wanted to make artworks of pre-polished stainless steel that would be very difficult to polish after normal TIG welding due to narrow access angles.


The amazingly different PUK solution: I was very surprised and delighted to find out about the PUK, and was treated to an unusually terrific demo of it in my studio. This is a machine I could never have ‘invented’, or even imagined! And it not only solved many of the problems for the specific artworks in mind, it opened the door to many new ideas that are now possible!


And not to be overlooked: the PUK is made in Germany to highest standards, and the support can’t be beat! Lampert has proven to me to be an innovative company that cares about quality, but also knows that what they are producing, solves problems and opens your creativity."

Robert Hallett

Goldsmith, jeweler, designer
Oakmont, Pennsylvania, USA

No seam and no porosity. The PUK was already paying its own way.



read more 

I have been working with precious metal for almost 50 years and some of my tools were passed on to me by a goldsmith who began work in about 1920. The PUK settled into a workshop where the anvil, planishing hammer and draw plates are used daily.

When the PUK arrived I had a problem to solve. I had just finished a custom ring with a 2.25 carat diamond set in two very wide prongs. I hadn’t gotten quite enough platinum over the diamond to feel secure. After about 5 hours of practice with the PUK I was able to add 0.75mm of clean platinum to the top of the prongs and hammer it down over the diamond. No seam and no porosity. Just like the extra platinum had always been there.

The PUK was already paying its own way.

Victor Magnes

Goldsmith, Johannesburg, South Africa

I not only use my Puk welder for difficult jewellery repairs, it’s used in my workshop every day.



read more 

Experience with Puk 3 welder at Jewellex 2009:

"I was on a hunt for a tool machine that is going to help me to make life easy doing fine soldering to chains, retipping claws on pieces without wasting too much time or money.

I guess in the last 5 hours of a Jewellex show being the last day, this was going to be a challenge that I never knew was going to make my dream come true. Walking down one of the aisles passing jeweller after show room, I saw a guy doing something weird but it was flashing spark lighting, this drew my attention.

A dream started to unfold at that very moment, I stood and watched this gent looking through a microscope and doing something that had blown me away, welding two pieces of metal together. I started asking questions - can you solder, weld a bracelet together without taking coloured stones out, his reply was 'yes', can you weld new claws on to a ring with stones and or coloured stones again 'yes'! – I asked please can I try, so he stood up and showed me to set up to suite my vision eye focus and I started welding ok at first it was messy, I sat for over an hour experimenting and I was glued to that chair. Honestly, at this time I just had a million mind flashes of what I was going to use my Puk 3 for and how it was going to work for me making life easy and more money with less stress.

Well its now two and a half years later and I have not only used my Puk welder for difficult jewellery repairs, it’s used in my workshop every day. I have also applied it in the Opticians world, helping to repair broken frames of glasses, all makes and metals types. It’s amazing, most repairs you cannot even see the repair, as being a micro weld. The real magic using the Puk there is so little heat you hold the piece in your hand and no burns.

I can just say to the team at Lampert never stop creating new technology you guys are amazing I don’t know what I would do without my Puk welder."


Victor Magnes
Goldsmith and CEO The Jewellery Connection

Workshops News

You are interested in the possibilities of use of our fine-welding devices? Or you are searching for one or another tip on working with your PUK? Then just sign up for our Workshop-News on this webpage.


We do not offer an ordinary advertising newsletter, our only intention is to support our customers. At regular intervals, we present small suggestions or examples for correct work with the PUK, so you may use our technology as efficiently as possible.


Show workshop examples

Lampert Werktechnik GmbH
Ettlebener Strasse 27 · 97440 Werneck · Germany
Tel. +49 9722 94 59 - 0 · Fax +49 9722 94 59 - 100 · mail@lampert.info