Old,
I have posted on here enough times that you had to
read how to do it. The short version is throw away the
arc weld wire, get some real cast iron rod . Build an oven
out of fire brick , leave a hole in the brick to out in a
weed burner to heat the work. Also need a cover either
asbestos or ceramic fiber fiber is the best. Heat the
whole thing to 1200 (dull red is 900 -1000) reduce flame so
you can weld ,reheat as necessary to maintain temperature.
When done heat to 1500 and slow cool , from 1500 to 1200
must take at least 15 minutes , wrap in fiber at let cool
over nite ,should take about 12 hrs to cool to be comfortable
to touch. The heating to 1500 and holding will normalize
the cast and it will not be brittle.
Look in the web site for pictures of the welding of a
6 hp York engine.
http://www.imageevent.com/gmachine
<p align="center">
oven with 2 propane burners to heat
casting to 1200 deg F to weld</p>
george