He needs to V the weld somewhat, and drill a small 1/8" hole at the ends of the cracks to prevent them from spreading,.....I usually use a Chronatron Chronaweld Universal Cast Iron welding rod #333, and stick weld (arc) the V'd out crack, then grind and dress, blend in,...no preheating of any kind needed,.......CC Cast Iron rods are $100 lb,...cheaper rods can be purchased thru Muggy weld


Mike