Discovery 300AC/DC Evo

Discovery 300AC/DC Evo s a revolutionary state-of-the-art 3Phase portable TIG AC/DC welding Inverter. TIG AC functions are ideal for welding aluminum, magnesium, and related alloys. Ordinary steels, stainless steel and copper can be easily welded in TIG DC.
Discovery 300AC/DC Evo is specifically designed for extremely precise welding in the construction, petrochemical, food industries and other applications that require very a high welding performance.

The new user interface (Evo) provides fast and effective access to all available functions. 50 programs can be loaded and saved in memory (JOB), All programs can be easily recalled when using an Up/Down torch. It is also possible to create different jobs sequences to be used on specific applications. Simple selection of the MMA mode provides a choice of the electrode-type (basic, rutile, CrNi, Alu) setting, resulting in optimizing the weldability and parameters. It is also possible to control the polarity switch (swap) directly from the user interface, avoiding any cable disconnection.


Download the Catalogue  Discovery 300AC/DC Evo_ENG.PDF


Download the Manual DISCOVERY 300AC/DC EVO (EN).pdf

WECO CU-12 (EN).pdf CE Discovery 300AC/DC EVO CE CU-12




CE Discovery 300AC/DC EVO CE CU-12


3x400Vac ± 15% @ 50-60Hz
30% 60% 100% 30% 60% 100%
300A 220A 180A 300A 220A 180A
5A – 300A 10A – 300A
14,6KVA – 11,4KW
460 x 230 x 325mm







Special Functions



Discovery 300AC/DC Evo is a high sophisticated three Phase Inverter TIG AC/DC portable welding machine.

Discovery 300AC/DC Evo is particularly indicated for extremely precise constructions, in petrochemical plants, food industry and other activities which require very high welding performance. Weco Special HF control grants 100% a rapid and highly precise arc ignition.
The AC welding is here optimized thanks to:

  • The synergic arch ignition can be adjusted from the front panel by the calibration of the tungsten electrode’s diameter.
  • The EXTRA FUSION function allows to shift the waveform towards the negative part with respect to zero. This makes it possible to create a highly penetrative and precise fusion bath, so that very light gauge sheets can be welded with an electrode tip comparable to that of an electrode for DC- TIG welding.
  • The MIX AC-DC wave allows to combine the efficacy of AC TIG welding with the high penetration of DC TIG welding, thus obtaining high welding speed and creating the weld puddle rapidly on a cold work piece. It is also possible to weld heavier aluminium gauges with lower amperage compared to standard AC/DC TIG welding.
  • The PULSE AC/DC welding is besides useful when welding for long time, in order to reduce the deformation on the base material.

The DC welding is here optimized thanks to:

  • TIG PULS up to 2,5 Khz and TIG PULS SYN (Synergic)
  • The Dynamic Arc (DYNarc) function which ensures an enhanced welding penetration, a better stability of the arc, avoiding any gluing between electrode and base metal; it allows to adjust the welding arc, just through slight torch’s movements, at any welding conditions.
  • The Q-Start function, makes the sheet tacking easier and minimize the time for it at the beginning of the welding process.
  • The Multi-Tack function, allows to minimize the heat output during the welding process and reduces the base material’s oxidation. This function permits often to avoid the post welding acid-treatments.
  • The Q-Spot function, permits to carry out very easily and precisely the sheet tacking operation, with minimum heat output and sheet deformation. It allows the positioning of the electrode on the exact tacking spot.
  • 50 programs can be loaded and saved in memory
  • Remote controls are available: for torch (UP&DOWN, potentiometer), foot pedal or remote control unit
  • Cooling unit, available