Check out this Tutorial & Demo on how to Arc Welding with 3 Car Batteries.
If you want to download these videos to your machine from youtube try this:
YTD Video Downloader
Formerly known as plain old YouTube Downloader, the recently renamed YTD Video Downloader updates to version 4.0 with a promise of 2x faster downloads and 2x faster video conversions, and perhaps more usefully, the ability to resume downloads after the temporary loss of an Internet connection. As usual, the installer includes a Spigot-based YTD Video Toolbar and offers to change your default search engine to Yahoo and add 5-6 shopping extensions to Google Chrome. Clicking the “Decline” button during the lone advertising screen in the installer lets users easily opt-out of all offers.
Downloading worked very well for popular video sites like YouTube, Vimeo, and Blip.TV.