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The PUK U5 – mobile and versatile

A compact TIG pulse welder: Just where conventional TIG welders reach their technical limits, especially of their lower power ranges, our technology for fine and ultrafine weldings comes into its own – regardless of the size of the workpiece.











Facts, that speak for themselves:

  • 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 welding microscope

  • 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




Compact and versatile TIG impulse welding device

On workpieces with a thickness of down to 0.2 mm or even less it is a simple process to produce high-quality welds. That way welding spots with a diameter of approx. 0.2 mm up to more than 3.5 mm can be set (depending on material and setting).



For daily use

Our welding technology is already successfully in use in over 80 countries in a wide range of different scopes – here are just a few examples:


  • Aerospace
  • Automotive industry
  • Colleges & universities
  • Dental industry
  • Electrical engineering
  • Industrial production
  • Instrument making
  • Jewellery industry
  • Lab technology
  • Measuring technology
  • Medical technology
  • Modelmaking
  • Optics industry
  • Plant engineering
  • Precision engineering
  • Prototyping
  • Repair and welding service sector
  • Research & Development
  • Restoration
  • Sensor technology
  • Sign making
  • Trade fair construction
  • Watch industry

PUK’s operating principle is as simple as it is ingenious

As soon as the tip of the electrode of the welding hand piece touches the workpiece, the welding process starts automatically. At the contact point, under an inert gas atmosphere, a melting process takes place.


In addition to many sorts of steel, different alloys of titanium, aluminum, copper and tin, as well as various precious metals and alloys are suitable for welding. Generally, all alloys suitable for laser or TIG welding can also be welded with the PUK U5. If necessary, welding wires can easily be fed or added.




Application videos

Industrial samples - 1.4301 / stainless steel

Industrial samples
Industrial samples 2

You will love the PUK!

  • Intuitive to operate
  • Thanks to intelligent pre-settings, only 2 operating steps are necessary. Select metal group and work situation > weld!



  • 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
  • Ergonomic work: Individually set work position and comfortable hand rests for fatigue-free work.
  • Special electrodes without poisonous components. With optimal ignition and welding properties
  • Practical and fast: Plug-in nozzles and nuts allow you to quickly change electrodes without tools.
  • Premium craftsmanship in every detail

PUK makes welding simple


The operating concept of the PUK U5 combines the advantages of a modern touchscreen with the tried-and-true operation via a rotary controller. Thus the intuitive and safe setting of the device is guaranteed at all times.

Correctly set the device in two steps:


  • 1. Select metal group




  • 2. Select welding situation
    > weld!

  • Setting of welding parameters with a single rotary controller
  • I.e. power and welding time can be adjusted "blindly" according to individual need.
  • You can continue to concentrate on the workpiece.



Recommended setting range:


  • A blue bar indicates the setting range recommended by our engineers.


Helpful information by touch

Informative help windows support the intuitive operation



  • If you touch a button on the display for a longer period of time (approximately 2 seconds), a help window pops up in which the basic functions of the button are explained.


  • Then touch the help window briefly to switch back to the operating menu.

The NEWS of the PUK U5


– the further development of a proven technology...


The patent-pending system for welding process monitoring
   · New software for contact monitoring of the hand piece
   · Prevention of welding errors through interruption of weld if excessive pressure is applied to the electrode
   · Increase in service life of electrode tip
   · Prevention of tungsten inclusions on sensitive surfaces or on workpieces and materials that still require further processing
   · Improvement in the overall weld quality through more uniform processing
   · Error prevention in the handling: Increase in process reliability and more consistent quality for larger quantities
   · Learning function: More rapid and simpler learning of correct welding procedure, especially for beginners

Faster progress to better results – "blind operation" with single-handed operation. Concentration remains focused on the workpiece.


Even higher-performance LED lighting in our new premium welding microscopes. More uniform illumination of the working area - more flexible use of the microscope. These microscopes can also be used as fully equipped workplace microscopes - not just for welding.


Setting of parameters for "Power", "Time" and menu navigation with one single rotary controller.


Preselection of two different welding cycles.


Speed function (only PUK U5+) – increased heat input into the workpiece for an improved welding performance when welding on highly conductive metals and alloys (e.g. copper).

Controlled welding process when welding on material thicknesses below 0.2 mm on wires and sheet metal with lowest and precise dosing and impact of the welding energy.

Preadjusted welding parameters for a wide variety of weldable metals and alloys (such as stainless steel, Hastelloy, various precious metals, titanium and much more).


Individual device set-up using the settings menu, e.g. preselection of welding cycle, calling operating levels up on screen and hiding them again, e.g. program memory, expert level, tack welding ...


Extremely simple touchscreen operation. Now with slide function!

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 "Made in Germany": The PUK welding devices are developed and produced in Germany.
  • Safety comes first: Our welder's eye protection systems are DIN CERTCO-tested and approved.
  • Standard-oriented: Every PUK welding system is manufactured in accordance with existing EN standards and carries a "CE" certificate of conformity.

Ease-of-use features for individual demands


  • Optimised "settings" menu
  • Simplified menu navigation with one single rotary controller
  • (De-)activation of the expert menu with 15 different welding curves
  • (De-)activation of the program memory with 20 custom programs
  • (De-)activation of the tack welding function
  • (De-)activation of the resistance welding function
  • (De-)activation of the micro mode
  • The selection of basic functions such as lighting, welding sequence, choice of language or acoustic welding signal.
  • Opening the gas valve for adjustiing the gas flow to the correct amount required

Tack welding function


For temporarily fixing metal parts

  • Using this process, two metal parts are bonded together at their contact point using resistance welding.


  • The parts can be "stuck" together so that they can then be finally attached using PUK welding or so that they can then be soldered.


  • The tack welding function is particularly well suited to processing metals with low electrical conductance. For example, steels, titanium, etc.

Resistance welding mode


The resistance welding mode can be an option for using individual solutions, e.g. in combination with a force controlled triggering of the weld.


  • Corresponding equipment has to be connected to the socket for the foot switch.


  • Using this process, two metal parts are bonded together at their contact point using resistance welding.


  • To respond to specific material conditions, various welding waveforms can be selected.



Automatic operation or foot switch


Using the foot switch can make work safer and easier when working on difficult workpiece constructions.

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


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

At home in the metal workshop


Sensible construction for long service life and continuous operation:


  • Actively cooled (only U5+)
    The PUK U5+ is actively cooled as necessary, and can be used in continous operation.


  • High-performance welding handpiece (only U5+)
    optimized welding performance, maximum transfer of power.

Accessories and special equipment


Additional practical system components and accessories such as the electrode grinding motor, flow meter, welding wires and much more are available to meet your individual needs. Feel free to visit our accessories page.

Technical data PUK U5 / PUK U5+




Current (WIG) min./max.

Current (WIG) min./max. (U5+)

Pulse duration (WIG) min./max.
Current (tack welding) min./max.
Pulse duration (tack welding) min./max.
Welding speed

Speed function (U5+)
Max. charging time
Number of metal programs
Program memory
Range display with recommended
Speed function (only U5+)

Active cooling (only U5+)
Help texts you can call up
Expert menu with freely selectable
welding curves
High-frequency welds
Automatic gas pre-flow time
Gas consumption
Shielding gas


Power consumption during welding
Power consumption in maintenance operation

Dimensions (w/h/d)

Weight (U5+)

4 - 630 A

4 - 720 A

0.5 - 34 ms

80 - 700 A

0.2 - 3 ms

up to 1.4 Hz

up to 2 Hz

0.8 s












ca. 2 l/min

Argon > 99.9 %

e.g. Argon 4.6

400 VA

7 W

16 x 32 x 30 cm

8.52 kg

8.77 kg


The PUK scope of delivery


The PUK welding system is delivered with the following accessories and contains all necessary documentation and instructions:

  • All necessary terminals,  gas hose, brush and connection cable
  • Operating manual



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

Informational material:

PUK U5 brochure

Operating manuals:

PUK U5 manual

Pricelist PUK U5


Mohan Chandie Shaw

Master Goldsmith / Designer / Stone setter
The Hague, the Netherlands

With my PUK I design, create and repair jewelry faster, better and more complex.


read more 

After using the Lampert PUK 2, I immediately bought the PUK 3 professional plus when it came out. It has almost the same possibilities and applications as a laser but you pay less. It is built as a tank so it has little to zero maintenance. With the PUK 3 I design, create and repair jewelry faster, better and more complex. In my point of view Lampert stands for high quality and innovation in the field of jewelry making. Lampert provides individual support and understands what you need as a professional.

Veselin Tenev

Master Jeweller
Royal Tunbridge Wells, Kent, United Kingdom

Actually, my dealer in the UK has told me when I have bought the machine only two words ...
"Have fun!"

read more 

We are so delighted to have the PUK and to work with it. Specially me, with those many years' experience behind. The PUK welder is my right hand and I couldn't imagine not having it even for one day away from me! Actually, my dealer in the UK has told me when I bought the machine only two words ...
"Have fun!" as a wish!
And thinking today, I am really having fun, enjoying working and discovering how pleased anyone can be to create things with it.

Christa Fischer


After my vocational training I have learned one more enriching technique besides the typical craftmanship – using a PUK welder.


read more 

After my vocational training I have learned one more enriching technique besides the typical craftmanship – using a PUK welder.
It makes my daily work much easier and I really enjoy working with it every time because it offers completely new opportunities, e.g. when working close to sensitive stones. The machine provides a special default for building up worn settings or for reattaching a broken ear stud without having to solder. Furthermore, I can facilely close pores and/or apply welding wire. The PUK's operation is very simple and it enables me to easily work on jewellery in a lot of different manners.


Dr. Daniela Zaharia

Bucharest, Romania

The PUK D5 opens a whole new world of design possibilities ... and is the ideal partner
in the digital printing era.

Daniela Zaharia (@dr_daniela_zaharia)

read more 

I’m an orthodontist and I love working with my patients. But I also like to work behind the scenes making some of the appliances I use. PUK D5 opens a whole new world of orthodontic appliances’ design possibilities. Design it and then is easy to make it. Nothing is impossible. PUK D5 machine is the ideal partner in the digital printing era and it makes me feel like an artist in orthodontics’ field. It helps me to achieve great results.

Daniela Zaharia (@dr_daniela_zaharia)

Kevin Paul

Watchcase restorations
Vienna, Austria

I can recommend the PUK without any doubts!




read more 

For my watchcase restorations I use the PUK on a daily base. It makes my day so much easier due to its quick and easy accessibility. I can recommend it without any doubts!


Steffen Dülk

Master Goldsmith / Münsterschwarzach Abbey
Vier Türme GmbH Gold- und Silberschmiede

Our entire team benefits from the PUK04 and its versatile fields of application.



read more 

We have to carry out a broad variety of works in our goldsmith’s workshop of the abbey. From filigree engagement rings made from platinum to rather big sacral utensils made from silver or tombac. That’s why our entire team benefits from the PUK04 and its versatile fields of application. It is extremely helpful for us for goldsmith’s productions, repairs or for the manufacture of new decorations for churches.



Studio Loubser

Bespoke Jewellers / South Africa

Our PUK welder has become an integral part of our workshop ... We are able to work accurately and effeciently, avoiding time-consuming manufacturing and repair processes.

read more 

Our PUK welder has become an integral part of our workshop, there is no repair challenge that we cannot face with confidence.


The PUK welder allows for small scale precision work, focussing heat in specific areas, allowing to weld close to gemstones and pearls. The concentrated generation of heat enables us to hold the pieces by hand whilst welding, thus there is no need for binding wire or the complex positioning of the pieces whilst soldering. We are able to work accurately and efficiently, avoiding time-consuming manufacturing and repair processes. We even use the PUK welder for our pre-positioning of claws before soldering on complex pieces occasionally.


The small scale and snazzy appearance of the welder blends into our workshop with ease.


It is however, worth mentioning that using the PUK welder is a skill that has to be learnt, you have to spend time becoming accustomed to using the machine, in order to use it to its maximum capacity.


Practice makes perfect.



Lev Shneiderman

Metal artist / Israel

 This tool is a real asset to any artist’s workshop!




read more 

As a veteran metal artist specializing in both traditional and modern technics, I see the Lampert PUK 5 as an essential tool for my studio. The PUK 5 enabled me to significantly upgrade my manufacturing process and provide more freedom with my art designs. The PUK 5 shortens the time it takes to build a construction. It allows handling seams and soldering more effectively and in a shorter time.


This tool is a real asset to any artist’s workshop!



Arkadiy Chernikov

New Westminster, Canada  

I consider this micro welding machine to be one of my best tool investments. 



read more 

I have purchased a PUK five years ago to expand my TIG welding to micro level, and never regret for that. Reliability, super easy to start, fast learning curve and lots of hidden capabilities for custom pulse programming - that's exactly what I was looking for. Besides, I would add reasonable argon consumption and ability for micro spot-welding. Maintenance is minimal: just re-fill the argon bottle and have your tungsten clean and sharp.  


For readers in North America: Robert from Lampert Tools USA in Chicago provides unbelievable help with order, shipment and delivery, and after I got my machine he gave me free one-day course for micro welding basics. Further customer support and getting consumables is fast, friendly and professional. I consider this micro welding machine to be one of my best tool investments. 

Michael Berger

Goldsmith and Kinetic

I can hardly imagine a work process without the PUK anymore.



read more 

There’s really not one day going by in the workshop without the PUK. How quickly this device has made itself indispensable was astonishing - I can hardly imagine a work process without it anymore.


Jointing my kinetic works made of stainless steel has particularly become child’s play with the PUK and opened completely new ways of fabrication. No matter if it’s tiniest mechanical elements, sheet metal constructions with a thickness of only 0.3 millimeters or big room sized works, I apply the PUK everywhere and it gets the job done reliably and with a high standard. 


The PUK - a tool that I’ve grown fond of and that I want to warmly recommend to all colleagues.




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