You can use copper, aluminum or brass for welding steel holes. I would screw on a oversized plate on one end to hold the rod in place while welding. I would then preheat the hole to over 500ºf before welding as this would help with cold lapp and I would try and weld as long as I could at one time, idealy until the weldment is finished.
If your stick welding and fast change electrodes you will most likey not have to chip slag between rod changes without any worry of slag entrapment.
After welding, as the weld cools to 500ºf(lead melts at 500º) then I would quench the drawbar in oil/water bath until cool as this restores some of the temper that will be lost during welding. A pipe with a end cap would work well for a quench "tub".
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