Welding Lead (carbon) at home!

Kids dont try this at home.
I love playing with #electricity so i borrowed my 30V 10A PSU and started thinking what can i do with it. Welding! but what material? Thats when i saw the lead box. But there's a problem, It can't actually be welded. It doesn't melt. Nothing can stop me so i started experiencing. At first i just attached the lead to two alligator clips and it just sparked for a short period (It was so bright that i just thought that the sun is in front of me:)). Then i attached another one to the other clip and by touching these to lead they make continues sparks and a lots of heat, I mean a lot.
https://steemit.com/science/@musefsadri/i-just-welded-mechanical-pencil-lead-at-apartment

My video is at DLive