If the cross section of metal in the projection is fractured, the heat build up will form more rapidly in the stretched material then at the workpiece interface area. This will result in the projection collapsing before fusion takes place.
  If I remember right... the very first video game was: PONG. It came out in the early to mid-70's, somewhere between 1972-1974. After that came ATARI. I know I'm right ab â¦ out the name (PONG)... the year; not so much.
The first home video games didn't appear until the early 1970s and didn't become widely popular until 1975. That was when Atari adapted its PONG game from the electronic arcade version, and video game mania swept the country. That was just the beginning, of course.