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PUK 04 Welding System $5295.00 - $5795.00
Instruction Manual
Developed by goldsmiths for goldsmiths, you weld – we take care of the details. Weld on findings, easily add metal, weld adjacent to stones, weld silver (alloys), fill porosity, attach workpieces prior to soldering, weld seams, and much more — all no problem with the PUK®.

With its components tailored to ideally complement each other, this modern welding system is the perfect laser alternative: Control unit, welding microscope and the precision handpiece combined with an intuitive approach to operating and handling, controlled via the modern touch display. It‘s the interaction between all of these elements that makes reliable and reproducible welding possible – the perfect device for every goldsmith and every workshop.

In addition to the standard equipment of the PUK04, this welding system can be expanded and added to from a wide range of useful components and practical accessories – depending entirely on your individual requirements.

Available with standard Microscope or with new tilt-adjustable Pivoting Arm Microscope.
  • Superior welding characteristics
  • Consistently reproducible high-quality welding results with all materials suitable for welding
  • Precise positioning of the spot welds
  • Very low, controllable development of heat
  • Welding possible on even the thinnest of materials
  • Welding in a protective atmosphere
  • Simple and intuitive to operate
  • 3-year warranty!
  • Manufactured using top quality materials, right down to the last detail
  • Precision handpiece for precision welding
  • Tested and certified product safety: GS & CE marks
  • DIN CERTCO certified eye protection in the microscope lens
  • Ergonomically optimised for work efficiency
  • Maintenance-free technology
  • Low initial costs, excellent price/performance ratio
  • Compact size – fits into every workshop
  • Welding microscope for precise welding results
  • Makes repairs and soldering work faster and easier
  • Very low costs of consumer materials
  • Low argon consumption
  • Practical system add-ons such as the PIN module, welding smoke absorber, welding wires and more; all available to suit your individual requirements.

Welding Speed: up to 1.5Hz
Inert Gas Consumption:
(e.g. argon 4.6)
approximately 2 liters/minute
Memory Slots: 40
Microscope Magnification: 10X
Microscope Eye Protection: DIN 3 / DIN 11
>UV 15 Protection / >IR 14 Protection
Electrical: 115V
Dimensions: 13"L x 5"W x 8"H
Net / Shipping Weights: 30 / 40

Touchscreen display leads the operator quickly and easily to the desired welding result. Metal (gold, silver, platinum, etc) is selected first followed by the actual welding scenario or geometry such as "thin sheet", "welding in an angle", or "apply welding wire", etc. With these pre-settings the various welding curves, the energy curve and any high frequency overlapping of pulses are set in advance and the recommended settings for the welding performance and time are implemented.

The display also shows recommended setting ranges, within which the operator can adjust the output and time requirements. The colorful visualization on the display makes it possible for deficient welding results due to unfavorable settings to be easily avoided. Help screens are available for every program symbol so you never have to wonder where you put the instruction manual. Personal device settings and individual welding parameters can be saved.

An expert mode is incorporated into PUK04 so the experienced welder can choose between various energy curves and store these with his/her individual settings for output and time. Expert mode also includes additional operating levels.

The PUK 04 enables even more precise welding than any previous version and even better welds are the result!

  • Automatic adjustment of ignition energy for absolutely even welding behavior across the entire performance range.
  • New high speed handpiece for extremely short welding times (from 0.5 milliseconds) creates the tiniest yet stable spot welds, as small as 0.2mm diameter.
  • Extremely short welding times at high energy densities enable welding with minimum heat effects.
  • Automatic welding flow reduction with simultaneous after-pulsing during the setting phase of the welding cycle assists in reducing the formation of cracks and shrinkage during the weld cooling process
  • The increased pulse amplitude on the PUK 04 has a strong compression effect and even more strongly concentrates the weld spot, improving welding in the peaks and niches of angular geometries.
  • Scroll down for additional videos.

    Replacing a Broken Prong with the PUK Welder
          In the video below a broken prong is lengthened by simply welding on an appropriate wire. Important here is that the wire is slanted slightly over the stone when joining, this way the prong doesn't have to be bent into place after welding. Interesting to note, is the way in which the task is finished off: after snipping off the excess wire, the end of the wire is melted to form a ball which then lies over stone, fixing it firmly in position.

    Ear Clip — Inserting a Retaining Pin with the PUK Welder
          The example below shows how the clasp of an ear clip can be fitted. As the piece is equipped with a spring, the retaining pin cannot be soldered into place. Normally this would only leave the possibility of riveting, the PUK though, gives the added possibility of welding the pin into place. To do this, one end of the pin is first melted into a ball; this is so that there is enough material for the weld which is to follow. This end is then welded and joined to the body of the piece and afterwards exactly the same procedure is adopted with the other end. The result is a stable assembly of the mechanism. Compared to riveting, this method gives an added advantage, here there is no chance that the pin will become loose or get lost altogether.

    Repairing a Watch Band with the PUK Welder
          A flexible joint on the armband of a costume jewellery watch is to be given a new pin; the hinge is also to be strengthened by adding welding wire. To secure the new pin, both its ends are welded to form a ball. Using this method, even repairs on pieces from the "low price" sector now become economically viable.

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    Showing comments 1-1 of 1
    1. Jeffrey on 8/2/2012, said:

    As any silversmith knows, silver solder is the ideal material to use when joining sterling by the traditional method of brazing. Sometimes I will receive an object which has been lead-soldered in the area in need of repair (or re-repair). Sometimes the joined area is not visibly accessible, and I don't know if lead has been used. In either case, I cannot use silver solder because the high temperature required will melt any lead in the joint and allow it to form its own alloy with the silver. Not pretty! And, using a low temperature tin/silver solder won't give me a sound joint or good silver color. For this reason, I use the PUK04. Pulse arc welding allows me to use solid sterling wire for a prefect color match (silver solders contain less fine silver than sterling). Since I work on larger objects, I purchased the optional articulating arm. And, I added the argon regulator which is extremely accurate. The pulse arc welding principle: Non-toxic argon gas is pumped through a handpiece and engulfs the welding area with a protective atmosphere to eliminate firestain. An electric arc (energy flow) is created from the point where the electrode touches the workpiece. As the electrode retracts, the arc is drawn up from the point of contact. Exactly here, melting occurs, and the result is a clean and stable weld. The high degree of precision is made possible by touching the workpiece with the tip of the electrode. The electrical arc necessary for welding is thus generated from exactly this point. By varying the angle at where the electrode tip touches, welds can be accurately steered in the desired direction and previously applied metal "distorted" or modeled. The heat is so localized that I can handle the object without getting burned, even at 1,640 degrees – the melting point of sterling! PUK04 Highlights: Uses the same alloy as the piece being created or repaired (no color issues as with solder); tacking eliminates the shifting of joints and the time involved in wiring-up an object; repair objects without harm to stones or patinas; attach findings without losing metal hardness; work on material as this as .001"; no firescale or firestain due to argon protective atmosphere; localized heat won't melt nearby joints or damage stones; fill in porosity with the same alloy; simple and intuitive to operate; ergonomic for work efficiency; maintenance-free; small footprint; very low cost of consumer materials (electrodes); extremely low argon consumption (I use approximately 1.5lpm); touch-screen operation; easy-on, easy-off handpiece nozzle when changing electrodes; 3-year warranty; it's a beautifully built piece of equipment. For additional information and examples of what can be accomplished with the PUK04, visit my PUK review page at Jeffrey Herman Herman Silver Restoration & Conservation
    Was this comment helpful? yes no   (4 people found this comment helpful, 0 did not)
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