As a JM Industrial welder, with pressure and structural tickets I will tell you this...I absolutely would not use a 6010 or 6011 rod to fix that! Personally I would use a pencil grinder and a variety of disks, stones and carbides and the like to properly prep and clean the area then use GMAW or my personal preference of GTAW to reweld with a ER70S wire. 6010 has 60,000psi tensile strength and ER70S has 70,000psi...6010 is alot more brittle and susceptible to cracks.

I will also say a total novice to welding will make a better weld with GMAW 9 times out of 10 versus with SMAW and a 6010 rod. Thats my $0.02 tho.