The TELWIN SUPERIOR TIG 421 DC redefines the concept of precision in TIG welding. At the heart of the device is an advanced microprocessor that monitors and corrects arc parameters in real time, ensuring unparalleled arc stability. Functions such as Slope-Up and Slope-Down current adjustment allow for perfect start and finish of the weld, eliminating defects such as craters or edge burn-through. In addition, precise regulation of the pre-flow and post-flow of shielding gas guarantees optimum protection of the weld pool and tungsten electrode, which is crucial for clean and durable joints, especially when welding reactive materials like titanium or stainless steels.

Spot Welding mode with adjustable duration allows for fast and repeatable tacking or short welds, greatly speeding up assembly work. A choice of HF (non-contact) or LIFT (contact by rubbing) ignition gives flexibility in a variety of working environments – HF provides a clean ignition without electrode contamination, while LIFT is ideal where electromagnetic interference must be minimized. Each of these features is designed to give the professional full control over the process and enable perfect results every time.

The TIG Puls function of the TELWIN SUPERIOR TIG 421 DC welder is a powerful tool in the hands of an experienced welder, opening up new possibilities for controlling the welding process. With the ability to precisely adjust the pulse frequency, base current, peak current and fill factor (pulse balance), the user can accurately manage the amount of heat introduced into the material. This is invaluable for welding thin sheet metal, where it minimizes the risk of distortion and burn-through, as well as for joining materials of different thicknesses.

Pulsed TIG welding achieves a narrower heat-affected zone (SWC), which translates into lower internal stresses in the weld and parent material, and thus higher joint life. In addition, pulsation makes it easier to control the weld pool, especially in forced positions (e.g., ceiling, wall), enabling welds with excellent geometry and deep penetration. The aesthetics of a pulsed-current weld, with a distinctive, regular scale pattern, are often desirable in applications where appearance matters. For the professional, this means the ability to take on more complex and demanding welding tasks with a guarantee of superior quality.

The TELWIN SUPERIOR TIG 421 DC is designed for heavy-duty use in industrial environments. The 400V three-phase power supply ensures stable operation and the ability to achieve the high welding currents required when joining thicker parts. A key parameter for professionals is the high duty cycle, which on this model is 400A at 40% for TIG and 320A at 60%, meaning the unit can operate for long periods without cooling breaks, even at maximum loads. This directly translates into greater productivity and efficiency on the welding bench.

The rugged IP23-rated metal housing attests to its suitability for harsh workshop and construction environments, protecting sensitive electronic components from dust and water droplets. Internal thermostatic, overvoltage and undervoltage protections protect the welder from damage resulting from network instability or overheating. The ability to connect a dedicated liquid cooler (e.g. Telwin G.R.A.) is key when TIG welding with high currents, ensuring optimal cooling of the handle and extending its life. All this makes the SUPERIOR TIG 421 DC a reliable workhorse that can be relied on for the most demanding projects.