Description

EXPERT TIG 422 AC/DC PULSE Pro7 LCD – versatile inverter welder for professionals and ambitious amateurs

The EXPERT TIG 422 AC/DC PULSE Pro7 LCD is a unique welding machine based on IGBT technology, capable of working in TIG AC/DC (including pulsed), spot TIG, MMA AC/DC and a range of specialized modes such as MULTITACK, DYNAMIC ARC, TIG MIX or RPT. With high welding current (up to 420 A in TIG mode) and a wealth of features, the device can handle a wide range of materials – from stainless and carbon steel to aluminum alloys and brass. At the same time, advanced solutions, such as the LCD touchscreen display and SMART TIG mode, make operation so intuitive that it can also be successfully used by less experienced welders. The equipment will be ideal for production workshops, service workshops, repair work, as well as demanding hobby projects, where high quality and stable welds are important.

Overview of key features – professional and easy to understand for everyone

1. TIG DC / TIG DC PULS – welding of stainless steels, carbon steels and copper alloys

DC TIG allows welding with direct current, which is the primary mode for joining carbon steels, stainless steels and other materials that require stable fusion and uniform weld structure. For professionals, this means full control over the weld pool and fewer spatters, especially in precision work. TIG DC PULS introduces additional current oscillation – part of the time the current is higher, allowing the material to melt quickly, and then it drops, reducing heat input; this is ideal for thin sheet metal and parts sensitive to distortion. For amateurs, pulsation means easier control of the pond and less risk of burn-through, which simplifies learning and improves weld aesthetics.

2. TIG AC / TIG AC PULS – efficient welding of aluminum and brass

In TIG AC mode, the device uses AC current, which effectively cleans oxides from the aluminum surface, ensuring a stable arc and strong melting in this difficult material. The professional welder will appreciate the ability to adjust the AC balance and AC frequency, which translates into the depth of fusion and the degree of “cleaning” (deoxidation stage). TIG AC PULS additionally allows for precise heat metering, limiting distortion in thin aluminum or brass profiles. For the less experienced, the AC pulse is an invaluable aid – it makes it easier to control the pond and reduces the risk of discoloration, thanks to periodic drops in current.

3. point (SPOT) TIG – precise “scoring” of thin materials

The TIG POINT function (also known as SPOT) enables very short, precise tacking, which is invaluable for the initial joining of parts before the actual welding. Professionals in the automotive or manufacturing industries often use it for so-called “hefting” of structures – the short catching of metal sheets minimizes distortion and facilitates further work. Amateurs, on the other hand, will appreciate not having to hold the materials in perfect position for a long time – spot tacking is simple and fast. In addition, with aluminum and thin-walled steel, SPOT reduces material overheating, increasing the chance of a neat and stable joint.

4. MULTITACK – intermittent mode for “cold” welding

The MULTITACK function, sometimes referred to as “cold welding,” introduces cyclic arc interruption, allowing material to be joined in short, regular pulses. Professionals in the aerospace or precision industry value this solution for the reduced stresses at the welding site – the interruptions in the heat input reduce the risk of deformation and preserve the high metallurgical quality of the weld. For amateurs, MULTITACK means greater fault tolerance: if the arc guidance is uneven, automatic “breaths” in the current supply allow you to correct the position and avoid overheating the material. Thanks to the adjustable frequency (e.g., 0.5 to 6.0 Hz), each user will adjust the intensity of the cycle to suit their own needs.

5. TIG MIX – hybrid mode of aluminum welding with cleaning and deep remelting

In TIG MIX mode, the welder combines the advantages of direct current (DC) and alternating current (AC) to create a hybrid flow, so that both full fusion and effective cleaning can be achieved in a single process. For the experienced welder, this means less need to change modes during operation and greater speed in making aluminum assemblies. For less familiar users, on the other hand, TIG MIX can provide safer operation – a single configuration is enough to cover a wide range of material requirements, reducing the risk of parameter errors. This results in more uniform welds and better aesthetics, which can be crucial for decorative and industrial projects.

6. TIG RPT and DYNAMIC ARC – smooth parameter change and arc width tuning

TIG RPT (Repeat) allows you to switch between two preset current levels in real time, such as the main current and the base current – especially useful when welding long sections of different thicknesses or in forced positions. The professional will appreciate this especially in assembly work, where it is often necessary to temporarily reduce the current to avoid overheating the edge, and then quickly return to higher values. On the other hand, DYNAMIC ARC allows additional “fine-tuning” of the welding arc to maintain the optimal weld width – which in practice means less grinding and touch-ups. For the amateur, this equates to greater equipment forbearance: if the electrode spacing is temporarily increased, the welder will automatically correct the parameters, protecting against sudden arc extinction.

7. MMA AC/DC and MMA PULS – with covered electrode even with aluminum

In addition to the TIG modes, the EXPERT TIG 422 AC/DC PULSE Pro7 LCD also allows for either direct current (DC) or alternating current (AC) metal-arc welding (MMA), an unusual but sometimes useful option – for example, with electrodes for aluminum or specialized alloys. Professionals in field work will appreciate this versatility, as it’s not uncommon to need to make a minor repair to an aluminum structure in difficult access conditions, where TIG is too time-consuming to prepare. MMA PULS further supports precise electrode droplet transfer, reducing spatter and making it easier to control the weld pool – especially important when welding in difficult positions. For less skilled operators, it makes it easier to maintain a stable arc, as automatic pulsing helps prevent arc extinguishing with minimally too long an arc or minor electrode guiding errors.

Touchscreen LCD display – simple operation with a wealth of settings

This model of welder is equipped with an easy-to-read LCD touch panel, which clearly shows all parameters – from the starting current, to the AC balance, to the HOT START and ARC FORCE values (in MMA mode). Thanks to this, even a less experienced user will quickly learn to set the functions correctly and adjust them to the material being welded. A professional, on the other hand, will be able to take full advantage of the potential of dozens of parameters, such as MultiWAVE, Cap Shaping or successive pulsation phases, precisely adjusting the arc characteristics. The screen also allows the user to save settings in the device’s memory, ensuring repeatability and reducing setup time for cyclic jobs.

SMART TIG – automatic synergy for easy operation

The SMART TIG function is an enhanced synergistic mode in which the welder suggests optimal parameters based on pre-entered data on material, thickness, gas type or method (AC/DC). Advanced welders will appreciate that they can quickly approach the desired settings and then make small adjustments “under themselves.” For hobbyists, this is an amazing support – they don’t need to know the best configurations by heart, because the device will suggest itself how to prevent overheating or cracking of the weld. This not only reduces learning time, but also minimizes material waste, as the number of failed attempts is significantly reduced.

Physical parameters and cooler – ready for intensive use

This machine usually comes complete with a dedicated liquid cooler, which allows you to weld longer with high currents without overheating the handle and the current source itself. Professionals performing welds on thick structures can count on not having to stop work due to thermal overload, which translates into higher productivity. Amateurs, on the other hand, are often concerned about overheating equipment with inexperience – here the cooler significantly reduces this risk, providing a safety reserve. The chassis itself is compact for such a powerful source, and the robust design and safety features (e.g., short circuit, thermal) extend the life of the entire set.

Technical data (example) – Expert TIG 422 AC/DC PULSE Pro7 LCD

• Welding methods: TIG AC, TIG DC, TIG MIX, TIG POINT, MULTITACK, MMA AC, MMA DC, MMA PULS, numerous pulse and RPT modes
• Maximum welding current (TIG): up to 420 A (depending on configuration and duty cycle)
• Power supply: 3-phase 3×400 V (50/60 Hz)
• Control panel: touchscreen LCD Pro7 display with enhanced settings (SMART TIG, MultiWAVE, Cap Shaping, etc.).
• Arc Occlusion: HF non-contact or LIFT (touch), switchable as required
• Cooling: possible liquid cooling (built-in radiator) – recommended for long-term work with high amperage
• Handle button modes: 2-takt, 4-takt, RPT (two-level current), spot welding (SPOT)
• Additional MMA functions: HOT START, ARC FORCE, ANTI STICK (prevents electrode sticking).
• Weight and dimensions: depending on the version with or without cooling – typically about 35-50 kg.
• Warranty and service: 12 months for professional use, with door-to-door system (see manufacturer’s documentation for details)

Summary – a welder for the discerning and beyond

If you’re looking for a versatile, powerful and easy-to-use TIG welder for virtually all types of metals, the EXPERT TIG 422 AC/DC PULSE Pro7 LCD will be an excellent choice. Professionals will find advanced features (including MULTITACK mode, DYNAMIC ARC, TIG MIX) and extensive parameter customization to tackle even the most complex aluminum, stainless steel or titanium projects. Less experienced operators, meanwhile, can take advantage of SMART TIG features and an easy-to-read LCD screen that simplifies setup and reduces missed welds. Thanks to efficient liquid cooling, a housing optimized for ergonomics, and the manufacturer’s years of experience with inverters, the device features long life and high comfort in all conditions.