A friend of mine called me this evening wanting to know about welding ductile iron. It seems his ductile iron backhoe boom has cracked. It has a "do not weld" tag on it. Somewhere I seem to recall that it could be welded with the proper technique. Is that the case? Or did I dream it up??

He uses the hoe in his septic business. It gets some tough usage. Hard digging and lots of hammering. The replacement cost is around $7k. If it can be welded, that'll be the way he'll go. What y'all think?