Cigweld Castcraft 100 cast iron welding rod. Maintenance Welding of Cast Irons. Soft, Ductile and Machinable Nickel Deposit. Easy starting and Stable Running on Portable 240V Welding Machines with Smoother Weld Deposit Surface Finish. Applications include the repair and reclamation of engine blocks, cylinder heads, differential housings, gear boxes, pump and machine housings and cast ironpulleys etc.