Merkle LogiTIG

High-performance professional units

The LogiTIG range of welding units is based on inverter technology and guarantees high-performance welding characteristics combined with exceptional flexibility.

These practical, portable systems can be used for welding aluminium in AC mode, steel and stainless steel with direct current (DC), and for MMA welding.

A small number of controls on the front panel make the system easy to operate. Nevertheless, numerous functions and parameters are available in “expert mode” for demanding users.

The range comprises three machines:

LogiTIG 221 AC/DC

LogiTIG 240 AC/DC
LogiTIG 300 AC/DC

Functionality and ease of use

• Stepless adjustment of welding current.
• Advanced inverter technology.
• Operation from a 230 V single-phase supply (LogiTIG 221/240 AC/DC).
• High-frequency (HF) ignition and LiftTIG ignition.
• Choice of 3 different AC waveforms: square, sine and noise-reduced.
• Jobs: Save and load complete parameter settings.
• 2 welding currents that can be activated via the welding torch.
• Digital display for welding current, time and frequency, with preview and hold functions.
• TIG pulse mode as standard.
• AC balance control to adjust the arc waveform and penetration.

• Adjustable AC frequency from 50 – 200 Hz.
• Adjustable parameters: start/end current, upslope/downslope time, gas pre/post-flow.
• Temperature-controlled cooling fan.
• Approved for welding in confined spaces, with the S symbol.
• MMA welding.
• Torch with potentiometer available as an option.
• Optional: Water cooling unit
• High-frequency TIG DC pulse up to 12 kHz for a precisely defined narrow plasma arc.

Merkle high-frequency DC pulse - a concentrated, narrow welding arc!

High-frequency DC pulse

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The MobiTIG and LogiTIG series machines feature high-frequency DC pulse as standard. The arc can be pulsed at frequencies up to 12 kHz. The arc characteristics offer exceptional possibilities in TIG DC welding that cannot be achieved with a standard TIG arc:

Standard TIG welding

High-frequency DC pulse welding

Features

• Extreme arc constriction.
• Arc similar to plasma welding.
• Lower heat input.
• Higher welding speed.
• Exceptionally stable arc.
• Ideal for fillet welds.
• Low noise emissions.

Portable TIG welding machines - welding units for DC!

The MobiTIG 190 DC, MobiTIG 280 DC and TIG 300 DC welding units are suitable for DC TIG welding of stainless steel, mild steel and copper. All units can operate in MMA mode. The units offer a wide range of functions.

Features:

• Stepless adjustment of welding current.
• Lightweight and portable.
• 2-step/4-step operation.
• High-frequency (HF) and LiftTIG ignition.
• Remote control connector.
• Digital display for all parameters, with preview and hold functions for welding current.
• Job programmes (MobiTIG).
• 2 welding currents activated at the welding torch.
• TIG pulsing as standard.
• Adjustable start/end current and downslope time.

Portable TIG welding units - outstanding ease of use and functionality!

Display (LogiTIG series):

• Digital display as standard.
• Programmable expert or standard mode.
• Choice of languages.
• PIN security lock.
• Easy operation via rotary selector.

TCG torch connector:

The main advantages of the Merkle TCG (TIG Center Gas) connector:

• Compact size
• Low weight
• Tool-free torch replacement
• Negative socket for connecting the TIG torch and electrode cable
• 2 rubber rings ensure a gas-tight seal

MMA welding:

• Arc force: Increases the welding current to prevent the electrode from sticking.
• Hotstart function: Increases the starting current to ensure reliable ignition. The hotstart current and time are adjustable.
• Anti Stick function: If the electrode sticks, the current is switched off immediately. Restarting after separation is only possible after a short delay.

TIG welding units - trolleys and water cooling units!

TW 120 trolley:

The TW 120 trolley is designed for easy transport of the welding unit in the workshop or on site.

• Extra-large wheels (200 mm).
• Gas cylinder holder for 10, 20 or 50 litre cylinders (when the machine is secured to the trolley).
• Drawer for tools, accessories, parts and consumables.
• Hanging points for cables and torch heads.
• Torch holders on the left and right for different types of welding torch.

WK 200/230/300 water cooling units:

The water cooling units can be fitted as an option to the MobiTIG 280 DC, LogiTIG and TIG 300 DC welding units. The welding machine and water cooling unit then form a compact unit that is easy to transport. Various applications are possible: welding with a water-cooled torch in the workshop or using a gas-cooled torch on site. Easy fitting and removal in just a few seconds via a plug-in electrical connector (optional) located on the unit's rear panel.

Technical data

*: 16 A slow-blow fuse
**: Minimum 20 A slow-blow fuse
*** BiPower operation
Technical details are subject to change