Building Fins

Old timers say weld aluminum with Pure tungsten (green). I say hell no! Try to do this with a pure electrode. I have switched over to 1.5% and 2% Lanthanated for both AC and DC welding. They can carry up to 50% more current than pure tungsten and due to lack of radioactive material you anent going to get cancer like with 2% Thoriated (red)!