That's actually done with a spot weld, It is grabbed on both sides and burned together, it is basically how cars are built...You don't need a welder to build a arcade machine however, Working steel takes years to even begin to understand the story it tells, But basic, sticking things together, patching control panels yes it ups your game over glue and such, What I am doing here is so far from a "normal" build it shouldn't even be considered by most...A viable alternative is your local weld shop (probibally not cheap), but for small projects is probably the easiest quickest way as a means to an end.