TIG welding of aluminum requires precise control of alternating current (AC), and the TELWIN TECHNOLOGY TIG 202 AC/DC is a true master in this area. The ability to adjust the AC balance, or the ratio of the duration of the positive and negative half-waves of current, plays a key role here. Setting a higher proportion of the negative half-wave (electrode on minus) ensures a deeper fusion and a narrower weld, while increasing the proportion of the positive half-wave (electrode on plus) intensifies the cathodic cleaning effect, removing stubborn aluminum oxides from the surface of the weld pool. This allows the welder to perfectly adjust the parameters to the thickness of the material and the degree of contamination, achieving welds without porosity and inclusions.

Another ace up the sleeve is adjustable AC current frequency over a wide range (e.g., 20-250 Hz). The higher frequency results in a narrower, more concentrated and more stable arc, which is ideal for precision welding of thin aluminum sheets and making fillet welds. This allows faster welding and better control of the weld pool. The lower frequencies generate a wider arc with softer characteristics, which can be beneficial for thicker materials or when more heat distribution is required. The combination of these adjustments gives the professional a tool to create X-ray-quality welds while minimizing the risk of distortion and overheating of the material.

The TIG pulse welding function of the TECHNOLOGY TIG 202 AC/DC is much more than just an option – it is an advanced tool for carving metal with the utmost precision. Pulsation involves cycling the welding current between the peak current value and the base current. This allows precise heat metering, which is invaluable for joining thin materials where the risk of burn-through is high, and for welding stainless steel, where heat control affects corrosion resistance.

With the ability to adjust pulse parameters – such as pulse frequency, pulse width (peak current duration) and base current value – the welder gains full control over the process. The result is better weld formation, the ability to create an aesthetically pleasing, regular “scaling,” deeper penetration with less linear heat input, and reduced thermal distortion of the weld material. In addition, this model offers EASY PULSE mode, which automatically optimizes the pulse parameters, which is a great convenience, especially for less experienced operators, allowing them to quickly achieve professional results. The BI-LEVEL function allows you to quickly switch between two pre-programmed welding current levels with the push of a button on the handle, which is ideal, for example, for welding materials with varying thicknesses or for making tack and root welds without interrupting your work.

Despite its advanced technology and wide range of features, the TELWIN TECHNOLOGY TIG 202 AC/DC is designed with the welder’s comfort and efficiency in mind. The centerpiece is a clear control panel with a digital display that clearly shows all key parameters. Ergonomic knobs and buttons ensure precise and quick adjustments, even when wearing welding gloves. The logical layout of functions makes menu navigation and device setup intuitive, minimizing set-up time.

The device also offers a number of smart features, such as memory of recent settings or the ability to save custom welding programs (if your model supports this, it’s worth checking – it’s not standard for this model, so I’ll skip it). But even without that, features such as THINSPOT (for fast and precise tacking) or advanced welding cycle settings (Pre Gas, Post Gas, Slope Up, Slope Down, start and end current) allow you to fully customize the process to the specific requirements of each job. For the professional, this means not only time savings, but also repeatability and high quality welds, regardless of the complexity of the project. Microprocessor control ensures parameter stability and reliable operation, which is the foundation of professional work.