Tig Welding Tips. Use a small propane torch and keep it moving until the part is hot enough. (Just hot enough to sizzle spit should be ok.) Another tip for reducing the amperage needed to Tig weld aluminum is to use a 50/50 or 80/20 argon/helium gas mix. The added helium really makes a difference. Not only will you need less amperage, but the aluminum will puddle quicker and cleaner than with pure argon. Trust me on this one! Regardless of whether you are using a cheap tig welder, the process remains the same. Tig welding is an art, and every day, more and more become certified users.