SIMPLICITY WITHOUT COMPROMISE. The Square Wave® 205 is a portable TIG and stick welding machine that lets hobbyists, makers, small fabricators and craftsmen explore their creativity. It is designed to help expand your welding expertise. As your skills and confidence grow, you can take advantage of the Square Wave 205’s additional functionality. No matter your skill level, you won’t be disappointed. The Square Wave 205 provides smooth and stable AC TIG welding on aluminum and DC TIG welding on steel, stainless steel and chrome-moly. A user-friendly interface enables the operators to set it, forget it and weld. The user interface makes machine setup easy. Available features, such as Pulse, which provides a drumbeat-like rhythm for filler metal deposition, make you become a better TIG welder - faster.