How To Make Simple Pencil Welding Machine At Home With Blade | Diy 12V Welding Machine Learn - How To Make a Simple Pencil Welding MachineSoldering iron At Home. Thanks For Watching hope you enjoyed today's practical invention. The Things I have Used: 1. Pencil 2. Shaving Blade 3. Some Wire 4. Power Supply: DC 12 Volt 5.