Using Green (Pure) Tungsten for TIG Welding Aluminum? It May Be Time to Switch.

For decades, green (pure) tungsten was considered the go-to choice for AC aluminum TIG welding. Then inverter machines came along and changed the rules. In this video, I compare traditional green tungsten to some of the modern rare-earth alternatives and explain why recommendations that were absolutely correct for transformer machines don’t always apply to today’s inverters. We’ll look at how different tungstens behave on AC, why some electrodes hold a point while others ball up, how that affects arc stability and penetration, and whether green tungsten still deserves a place in your shop. If you’ve ever wondered why one welder swears by pure tungsten while another insists on lanthanated or ceriated, this video breaks down what’s actually happening at the arc instead of relying on shop folklore. Whether you’re new to aluminum TIG welding or have been doing it for years, understanding the relationship between tungsten type and machine technology can help you get a more stable arc, better control, and cleaner welds.