This is part 3 in a "how to tig weld aluminum" series. this video is about AC frequency adjustments and when to use different frequency settings. Rule of thumb here is higher frequencies seem to help on thinner aluminum and lower frequencies help on thicker aluminum...especially for tig welding aluminum castings see the full article here https://goo.gl/C46Kkl For Tig Fingers and other welding accessories, visit my store https://weldmongerstore.com | Welding Tips & Tricks