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Merkle LiteTIG 300 AC/DC

Manufacturer: Merkle (Germany)
Model: LiteTIG 300 AC/DC
Technology: IGBT Inverter
Welding Processes: TIG AC/DC, TIG DC Pulse, MMA (Stick)
Input Power: 400 V, 3-phase, 50/60 Hz

Product Description
The Merkle LiteTIG 300 AC/DC is a compact, high-performance professional TIG welding power source, developed using advanced inverter technology to deliver excellent arc characteristics and outstanding functionality. The machine supports both AC and DC welding, making it ideal for welding aluminium as well as steel, stainless steel, and a wide range of non-ferrous metals.
Designed for professionals, the LiteTIG 300 AC/DC combines simple front-panel operation with a powerful Expert Mode, allowing experienced welders to fully customize all welding parameters for maximum precision and weld quality.

Control & User Interface
• Digital Display (Standard) – Clear monitoring of current, time, frequency, and welding parameters
• Standard & Expert Modes – Programmable modes for beginners and professionals
• Multi-Language Menu
• Control Panel Lock with PIN Code
• Rotary Control Knob – Fast and intuitive parameter adjustment
• Memory Functions – Save and recall complete welding programs (up to 28 jobs)

Advanced TIG Technology
• AC/DC TIG Welding – Suitable for aluminium, magnesium, copper, and other non-ferrous metals
• HF & Lift-Arc Ignition – Clean and reliable arc start
• High-Frequency DC Pulse up to 12 kHz – Enables extremely narrow, focused arcs for superior control and heat input reduction
• AC Frequency Control (50–200 Hz) – Adjustable arc shape and penetration
• AC Balance Control – Optimized oxide cleaning vs. penetration
• Selectable AC Waveforms – Square, soft, and sinusoidal
• Pulse Modes: Slow pulse, fast pulse, and high-frequency pulse
• Spot Welding Function – Adjustable from 0.01 to 2.5 s
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MMA (Stick) Welding
The LiteTIG 300 AC/DC also supports MMA welding with coated electrodes from 1.6 to 4.0 mm (electrode holder required if not included):
• Hot Start – Adjustable for reliable arc ignition
• Arc Force – Prevents electrode sticking
• Anti-Stick – Automatically cuts current if the electrode sticks
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Additional Features
• Two Welding Currents (I1 / I2) – Switchable via Merkle TIG torch
• 2T / 4T Operation Modes
• Pedal Control Support
• Temperature-Controlled Cooling Fan
• Air or Water-Cooled Torch Compatibility
• Confined Space Approved (“S” Symbol)
• Optional Water Cooling Unit

Applications
• Professional TIG welding
• Industrial production and fabrication
• Maintenance and repair work
• Automotive and motorcycle repair
• Precision welding of thin materials

Technical Specifications
• Input Voltage: 400 V, 3-phase, 50/60 Hz
• Output Current Range: 5 – 300 A
• Output Voltage (TIG / MMA): 10 – 22 V / 20 – 32 V
• Duty Cycle 40 °C (10 min):
o 50% – 300 A (TIG)
o 60% – 280 A (TIG) / 270 A (MMA)
o 100% – 250 A (TIG) / 230 A (MMA)
• TIG DC Pulse Frequency: 0.2 Hz – 12 kHz
• Open-Circuit Voltage: 70 V
• AC Frequency: 50 – 200 Hz
• AC Waveforms: Square, soft, sinusoidal
• Electrode Diameter (MMA): 1.5 – 4.0 mm
• Power Factor: 0.95 cosφ
• Protection Class: IP23
• Insulation Class: H
• Torch Connection: Merkle TCG, 5-pole
• Power Connection: 50 mm²
• Cooling: Air or water
• Dimensions (L × W × H): 600 × 300 × 575 mm
• Weight: 39.2 kg