How do you lock in vertical re bar in to horizontal re bar in footing?

Yes you use tie wire it is light weight and all you do is insert the vertical and lift the horizontal bar to the height you require and then wrap with wire and twist to secure. Then you can pour your concrete without the steel slipping to the bottom of the pour where it does no good.|||normally they are just tied with wire where they meet but I guess you could weld them if you have the resources