The TecArc OpteARC S300 squarewave AC/DC TIG water cooled welder is constructed using the very latest Mitsubishi IGBT chopper technology. This combines all the performance advantages of the very best inverter technology with the ruggedness of transformer based machines. It also gives a substantial reduction in size & weight of the machine compared to conventional old school technology. The benefits of our OPTeARC technology are not to be underestimated! You get precise instant arc starts every time, with welding performance as good or better than the best US or German made machines & also benefit from ultra low power consumption.

Superior performance AC-DC TIG machines –

Now with 2020 updates - DAC waveform control - water cooler only runs when needed  slimline modern styling. 

The ETIG AC-DC range perform so well you would be disappointed to use anything else. They are really simple to set up & use, anyone who has TIG welded previously can use these in seconds. Unlike competitors machines there is no programming needed or constant referring back to instruction manuals. In addition we have some unique functions all aimed at improved welding performance & reducing welding & operating costs. For instance, on AC our updated DAC control provides 3 infinitely adjustable waveform controls; 1) Variable frequency from 25HZ right up to 200HZ. 2) Extended AC balance control, from a perfectly balanced 50% AC right through to 100% negative or 100% positive electrode. 3) Z waveform control provides adjustment of the AC wave shape from a perfect crisp square wave through to softer & quieter waveforms like modified sine wave, & modified triangular shape. These functions make it possible to do so much more with AC welding of aluminium & alloys. In addition Q-Pulse (high speed pulsing) function for both AC & DC can bring increased welding productivity by up to 35% & therefore reduce your welding costs. OPTeARC technology gives you ultra smooth welding current output, this means a more stable weld pool & better looking welds! These machines will not fail in dirty or damp workshops like inverters do, they are not affected by fluctuations on input supply they will just keep welding reliably year after year.

All ETIG S models are supplied complete with undercarriage for gas bottle & wheels – no expensive trolleys are needed.

The benefits of the OPTeARC ETIG machines really do add up, which makes these machines the perfect choice for all manual & automatic welding applications, including general fabrication, aerospace work, petrochemical, offshore, Oil & Gas, precision engineering, motorsport engineering, etc.

Key benefits of the OPTeARC ETIG machines AC-DC

• Superb welding performance on AC & DC TIG & AC & DC MMA with capability of all electrode types.
• Perfect arc starts & welds every time from min to max power on both TIG & MMA.
• Rugged reliable design unaffected by harsh operating conditions or poor input supply, guaranteed!
• Advanced features to increase welding speed, reduce heat affected zone, increase penetration etc.
• Ultra low power consumption reduces your running costs & helps the environment.
• Ready to accept our EFEED 40 cold wire feeder to increase productivity further.

Standard ETIG S AC-DC machine functions.

• Infinitely variable AC frequency from 25HZ to 200HZ.
• Extended AC balance control from 100% – to 100% + electrode gives you so much more control on AC welding.
• Z control allows infinite adjustment of the AC waveform from a crisp square wave through to softer square, sine & triangular waveforms.
• Precise current control can be set to within +/-1 amp, digital display shows pre-set value then exact value when welding.
• Variable up & down slope controls, 0-5 seconds upslope, 0-15 seconds downslope range.
• Pulse function allows normal pulse function 0.5HZ – 200Hz or QPulse (high frequency pulsing up to 2KHZ or 2000PPS)
• Precise pre-setting of pulse peak & base current.
• Torch trigger latching 4T/2T, (when used on 4T with our OPTeARC ETIG wire feeder the trigger can control wire start/stop)
• Variable gas pre-flow & gas post flow control, 0-5 seconds pre-flow, 0-15 seconds post-flow range.
• Electronic pulse HF for precise instant arc starts (I.T. friendly so will not affect your phone or PC etc)
• MMA electrode welding on both DC & AC with super smooth arc on all electrodes & welds cellulosics/difficult electrodes perfectly!
• Remote current function allows use of a foot pedal, hand remote or current control on TIG torch, with adjustable remote range.
• Automatic compensation for varying input power, long extension leads or unstable generators.
• Auto shut down of gas & welding voltage if no arc after 10 sec to save gas & prevent unexpected operator flash or arcing.
• Water cooling now runs only when needed to save energy, noise & pump wear.
• Water cooling includes flow protection to protect both torch & pump if liquid not flowing.

2 year warranty all items - except torch.

Supply Voltage 400V
Welding Range (amps) 10A - 300 AC & DC
Duty cycle -60% @ 245 amps
Duty cycle -40% @ 300 amps
Input fuse (D-slow) 16A - optional 230V model requires 32 amps
Minimum generator rating* 5.5 KVA (up to 3/4 output)
Weight approx  93KG
Size approx  900mmL x 400mmW x 720mmH

Supplied with 12.5ft WP18F TIG torch.

Further info.

Outstanding performance, reliability & simplicity of use make these the sensible choice for all industrial welding applications. ETIG S models perform at least as well as the best US & EU made inverters but our technology doesn't suffer the reliability issues & high repair costs of inverter based machines. ETIG models are simple to maintain & fault-find on, they are fitted with only 2 low cost control PCB’s both of which include LEDs allowing us to diagnose almost any fault over the telephone.

ETIG models include protection against real world conditions such as over voltage spikes, TIG torch trigger shorts to power cable or earth, HF protection of remote control circuits, short circuit protection of remote control wires & many others.

From a portability point these may not be quite as small or lightweight as an inverter but inverters are often bolted onto a trolley/cart & end up similar size to our ETIG S models. So unless you require a hand portable machine why choose an inverter?

Most ETIG S models are specified with water cooling which now only runs as needed, this reduces noise & energy & gives a significant increase in pump lifespan. Built in protection circuits stop the welding process & pump in the event of a fault. Furthermore a link is now provided to disable the water cooling to run air cooled torches.

If you choose to order the ETIG S models without water cooling we can provide an upgrade water cooling kit for fitting at a later time.

All ETIG S models come ready to accept our EFEED 40 automatic cold wire TIG feeder. This can increase productivity by at least 30% & can be used for both manual & automated welding. Non stop TIG welding, lower cost filler material, simpler one hand TIG welding.

The EFFED 40 synchronises with the ETIG to deliver the filler wire at the correct time & speed, wire start stop point can be set to allow a pool to form before feeding wire & the wire to stop feeding during a downslope period to give perfect starting & finish. In addition when the ETIG is used on pulse the wire will dab into the pool in perfect synchrony. Furthermore if manual operation is selected on the EFEED this will allow the wire to start from the same TIG torch switch. Select 4T operation on the ETIG, press switch to start weld, release to start wire, press to start down slope period, release to stop wire, this operation provides the operator with complete control of every single weld. Wire retract function can be set to pull the wire back away from the pool at the end of each weld.