Merkle Insquare

Insquare delivers peak performance every day.

Insquare series TIG (WIG) inverter welding machines deliver fully professional performance. Five models, ranging from 320 A to 600 A and available for DC and AC/DC welding, meet even the most demanding industrial application requirements. Professionals are impressed by the Merkle Insquare machines' impeccable technology and comprehensive equipment.

• IGBT inverter power sources.
• Low, balanced mains load thanks to the three-phase connection.
• Stable arc across the entire range in AC mode thanks to the square or low-noise waveform.
• Infinitely adjustable welding frequency in AC mode.
• Switchable to MMA welding.
• Perfectly smoothed DC current for optimal TIG and MMA welding.
• DC high-frequency pulsing for a constricted, concentrated arc.
• Excellent arc ignition across the entire range thanks to the separate
  ignition circuit.
• Minimal electromagnetic emissions from the HF ignition unit.
• Perfect cleaning action in AC mode.
• Adjustable arc shape:
  Narrow: for fillet welding.
  Wide: for butt welding.
• EMC circuit to prevent electromagnetic emissions.

Comprehensive control functions

• TIG welding processes:
  TIG DC negative, TIG DC positive*.
  TIG DC negative with starting pulse*.
  TIG AC "low-noise"*.
  TIG AC "square wave"*.
  TIG AC "sine wave"*.
• MMA welding processes:
  Electrode negative, electrode positive*.
  Electrode "sine wave"*.
  Electrode "square wave".
• 20 programme slots for storing
  welding programmes.
• 2 individually adjustable welding currents, selectable
  in 4-step mode with 2 welding currents or
  using a welding torch with two push-buttons.

• Adjustable parameters: gas pre-flow and post-flow times,
  starting and final currents, upslope and downslope times.
• Parameter preselection using 2 rotary encoders.
• 2 large LED displays with preview and hold functions
  for current, voltage, time and frequency.
• Pulse function and spot welding mode.
• High-frequency pulsing up to 5 kHz with an extremely narrow arc.
• Current control via a potentiometer in the welding torch (optional).
• High-frequency and LiftTIG ignition.
• 2-step, 4-step, 4-step with 2 currents.
• AC frequency adjustment: 50 - 200 Hz*.
• AC balance (wave balance control):

  Positive/negative ratio infinitely adjustable from 9% to 91%*.

• Remote control via hand, torch or foot remote control.

Merkle TIG (WIG) welding torch with Quick TIG system

• Only a few components.
• The torch head and collet are combined into a single unit.
• Double push-button switch.
• Integrated potentiometer (optional).
• Highly flexible hose package with partial leather covering.
• Ball joint on the handle.

Spacious controls for maximum convenience!

The Merkle Insquare series display has been designed to meet the needs of true professionals.

The clear arrangement of functions, digital displays and detailed selection of all welding parameters provide maximum functionality and safety in everyday work. The new lockable glass front panel on the W 321 and W 421 models provides even greater protection against accidental changes to welding parameters.

Perfect welding in every application!

The machines are designed specifically for industrial applications and are ideally suited to manual, automatic and robotic operation. The following parameters can be controlled via a PLC or robot interface:

• Welding current.
• Welding frequency (AC mode).
• Wave balance (AC mode).

Manual welding

Automatic welding

Robotic welding

Merkle DC high-frequency pulsing - A concentrated, constricted arc!

DC high-frequency pulsing

MobiTIG and LogiTIG series machines are equipped with DC high-frequency pulsing as standard. The arc pulses at frequencies of up to 12 kHz. This opens up exceptional possibilities in TIG (WIG) DC welding that cannot be achieved with a conventional arc.

Standard TIG welding

With DC high-frequency pulsing

Performance characteristics

• Strongly constricted arc.
• Plasma-like arc.
• Low heat input.
• Higher welding speed.
• Extremely directionally stable arc.
• Ideal for welding close to corners.
• Low noise levels (at 12 kHz).

Technical data