Inverter-based AC/DC power source for TIG and MMA welding

The Heliarc power source uses inverter technology, which delivers significantly increased energy efficiency and superior functionality in a package that is lighter, smaller, and less expensive than old, less efficient SCR technology machines.

Easy-to-achieve, optimised arc settings enable the operator to weld aluminium using a pointed tungsten. The tungsten remains pointed improving arc starts, heat input and arc stability, thus assuring high-quality welds. Heliarc's pulse current allows for smaller HAZ (Heat Affect Zone), better control of the weld pool, and less plate deformation.

In AC GTAW (TIG) mode, the power source uses high frequency (HF) only to initiate the arc, compared with older power source technology which requires HF to be continuous. Heliarc's fast switching AC process removes the need for HF during welding, reducing electrical noise and the risk of interference to surrounding electronics. In addition, high frequency can be switched off in favour of ESAB's live TIG arc start method when welding in areas where high frequency is not permitted.

Enhanced AC balance controls provide significantly improved cleaning or penetration compared with conventional AC/DC power sources. Moreover, Heliarc provides an AC frequency control which focuses the arc for narrow weld beads and faster travel speed. Reducing the weld bead has significant advantages in reducing cost, as well as in reducing welding consumable and arc time, resulting in improved efficiency and operating profit.

Heliarc also features AC Pulse (GTAW) TIG from 0.4 up to 2Hz, suitable for welding thin aluminium. High-speed DC pulse GTAW (TIG) provides a smooth welding output which is precisely controlled to deliver faster travel speeds and more penetration. Increasing the pulses per second also improves arc stability and enhances interfusion between base and filler material.

Fast set up and excellent arc control

Heliarc's control panel is easy to set up and operate. Five clear, logical work zones allow the operator to choose the options and settings needed for fast set up and excellent arc control. All controls are centrally located. Easy-to-use buttons provide slope down, pulse current, background current, pre-gas, post-gas, pulse and duty options. The machine's memory can store and recall up to 60 user-defined welding programs. The machine's internal communication is entirely digital for high accuracy and repeatability.

Operators have the flexibility to choose between MMA, TIG 2- and 4-stroke mode (trigger latch), TIG spot, and trigger-enabled peak to background current, which can be used as a manual pulse to decrease heat input and control puddle fluidity while welding. In stick mode, the submenu allows for access to adjustable Hot Start and Arc Force settings.

Two Heliarc models are currently available:

• Heliarc 283i AC/DC, a 3-phase 50/60Hz unit with 400V input and a maximum TIG AC/DC output of 280A at a 100 per cent duty cycle
• Heliarc 353i AC/DC, a 3-phase 50/60Hz unit with 400V input and a maximum TIG AC/DC output of 350A at a 45 per cent duty cycle

For more information about Heliarc, visit www.esab.co.uk.