Suspension and frame work, cracked LCA, advice welcome

Jim Lusk said

I know very little about stick welding, so that is for somebody else to answer. As for fixing that arm, first determine if it is straight. If it's bent at all you can't fix that. Find where you think the end of the crack is and drill a small hole at the spot, then grind a V into the rest of the crack and weld away.

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Thanks Jim for your input, I think the previous welding must have been a stick weld and was done just on the surface, and after 15,000 mi have not cracked, so I will try to dril a holeas you said at the end of the crack and grind a v shape chennel, then arch weld with good penetration. Stick welding using 6013 is famous for being more efficient than mig welding on metal structures subject to flexing like roofing, etc..., but that is mostly on low carbon steel.
The thing is, I want to grind the extras to make it look like new and there is not much room there for a disk.
Cheers.