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We do not know what "welding" has been attempted, so assuming the worst! Use an angle head grinder and remove all existing weld to base metal. Do not reduce the thickness of the frame metal or bracket. Use wedges and clamps to position the frame rail onto the bracket so that it is correctly positioned. V out the area where they touch to about 2/3 of the frame thickness. Do not make a wide V (about 1/4" at the widest). I would use 5/32" E-1714 rod on AC with about 120-135 amps. Weld a root pass down from top about one inch and stop. Beat the devil out of the weld when it has just turned black with a pointed slag hammer. (this stress relieves the metal and makes it much stronger) wait about 5 minutes, and make another 1" pass starting at the bottom of the first. Again beat it to death with the hammer. Again wait five minutes then cool the weld area with air (not water) When cool repeat the process until a root pass, and three top passes are applied and beaten to death (using a 1/4" drift punch on the top passes makes your pounding less visible). Grind off spatter and paint. JimN
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