what info do you want??? tips and ticks??? its pretty self explanitory... you just add welds to the existing welds that hold you chassis sections together making your chassis stiffer stronger and less likely to rip apart and get thrown everywhere when in the case of an accident...
here is a great example... your welds can vary from just spot welding to doing a full bead... and the more places you have welded the stronger it is...
examples for the different uses of the welds
most rally cars use spot welds around 2-3'' long and about 3-4'' apart to allow some flex in the shell... and being exposed to rough roads and harsh elements the little bit of chassis flex helps prevent damage that can be caused by sudden pot hole impacts flight time hot to sudden cold from water and other things
most pavement queens use full beads to make the chassis as stiff as possible because there isn't a need for the chassis to be able flex since most tracks are smooth and free of debris