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West Country Welding Supplies

Tig Welder - EWM Tetrix 421 AC/DC activArc - West Country Welding Supplies, UK - West Country Welding Supplies, UK

Tig Welder - EWM Tetrix 421 AC/DC activArc

All EWM Machines come with a three year parts and labour warranty.


  • Tetrix 421 AC/DC activeArcMaximum efficiency for all requirements with reproducible welding results and excellent quality thanks to the fully digital inverter welding technology
  • Unique AC functionality: Synchronous operation of 2 machines for two-sided, simultaneous welding, AC special for the easy joining of very different thickness aluminium panels, e.g. 1 mm to 10 mm
  • EWM activArc – the powerful TIG arc - faster, better and simpler welding across the entire power range
  • Self-explanatory, intuitive operating concepts for everyone - either the standard setting, job mode or synergic one-dial operation so that you can concentrate fully on your welding task!
  • Maximum mobility: Easily movable thanks to large wheels, fits through standard doors, easy loading and unloading thanks to the even wheel gauge, transportable by crane and fork lift
  • Intelligent casing design with optimised air guidance for longer duty cycle and ventilation control for less contamination in the machine.
  • Powerful cooling system for the torch, with centrifugal pump, cooler with large surface area and an extra-large tank (12 litres)
  • COMFORT, SYNERGIC: Ideal for robot, industrial bus and mechanised applications and documentation via optional interfaces

Main Areas of Use

  • TIG AC welding: Aluminium and aluminium alloys
  • TIG DC welding (minus pole): Unalloyed, low-alloy and high-alloy steels, nickel-based alloys, copper and special metals
  • MMA welding (direct current) with rutile and basic coated electrodes: Unalloyed and low- and highalloy steels, nickel-based and copper alloys
  • Production and repair work, metal construction, food and chemicals industries, pipeline, closed container and equipment construction, vehicle, machine, plant and tool construction, and more


  • TIG and MMA inverter AC/DC welding machine
  • Mobile, water cooled, decentralised, can be lifted by crane and moved by fork lift, 5m mains supply lead
  • pressure monitor, pump and temperature-controlled fan
  • 100% tested and free welded

Technical Specifications

Welding current 5 A -420 A
Duty cycle 20°

420 A
380 A
Duty cycle 40°

350 A
300 A
Open circuit voltage 92V
Mains voltage (tolerances) 3 x 400 V (-25% / +20%)
max. connected load 23,1 kVA
recom. generator rating 31,2 kVA
Mains fuse 3 x 35 A
Dimensions (LxWxH) 1080 x 690 x 1155 mm
Weight 145 kg

Contact us for more details or to discuss any of your welding needs

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