Thread: How do properly grind down a weld?

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I cut the old front shock mounts out ,and the area where the emergency brake passes through the frame.I want a smooth frame rail.I will use a aftermarket E.B. I am going to get the frame sand blasted and then weld from the back.I will then box the frame with 3/16 inch metal.After boxing the frame do you think it will be strong ,and not crack, and handle 600 horses? Should I weld a plate behind the sections I cut out then box,they are vertical and horizontal welds.I am redoing my 65 chevy short bed to handle racing abuse.After I weld the boxing plates I will weld in all the crossmembers.I will also install a simple roll cage for safety ,this should help keep the frame from twisting.Thanks for the input.