How to butt weld tubing with backing. 

[@mackellyman5642]

Good job on explaining the need for backing and root weld.

[@nateatgoodmayhemracing4597]

Thanks Mac. Any suggestions for other things I could cover?

[@mackellyman5642]

@@nateatgoodmayhemracing4597 More fabrication and design please...

[@davevandenbranden3309]

excellent explanation. Just to add, for anyone coming here thinking about building a cage for drag racing, NHRA rules state: "Any grinding of welds prohibited. All butt welds must have visible reinforcement (i.e., sleeve and rosette welds)." Cheers!