It isn't as easy as just "welding them up", mikeo. If you did that the chances are the alignment between the two side plates would be affected, and you'd end up with a corkscrew-shaped mower frame. It would be difficult to produce flat surfaces when you mowed if that happened. Successful repair requires stripping the mower down to a bare frame and repairing the multiple cracks with minimal heating, in very short runs on each crack, checking frame alignment constantly. You need to work out a sequence for those short runs so that their distortionary effects cancel each other out when the frame cools down.
