I hard faced my shovel

That might be a good job for a copper backing plate. I got good results from it when practicing but couldn't fit it into the tight curved space I was welding on the car fender.

-jsw

If you can find one, this is what a powder torch excels at doing. Remember to only do one side so it wears sharp.

Which Side? On the tiller tines especially. As the tines spin they describe a cylinder. Should the hard facing be applied to the outside or inside of this imaginary cylinder?

Per the ag engineering department which taught me to weld, you should apply the hardface to the side (of the edge) which wears more/faster (when unfaced.) They suggested using it just enough to wear the paint off the working edges to be sure you were guessing right about that (and where it was really needed), and to hardface from new rather than starting with old and dull if at all possible, prevention being easier than a whole lot of build-up to get the shape corrected, or hardfacing when it was already dulled to the point of being misshapen (and then preserving that poor shape with a layer of hardface.

On shovels, I tend to do the back or outside. I _think_ that would also be true of the "L" shaped tiller tines, but you could do worse than to reshape them to "sharp", put some paint on, and run them for a minute or three to verify.