《Liccoln WPHB - Section 08 (Welding Cast Iron and Cast Steel)》.pdf

Section 8 WELDING CAST IRON AND CAST STEEL SECTION 8.1 WELDING CAST IRON Page Types of Cast Iron 8.1-1 Electrodes for Cast Iron 8.1-2 Welding Gray and Malleable Irons 8.1-2 Electrode Selection and Welding Guidelines 8.1-2 Preparations for Repair Welding . . . . . . .. 8.1-3 Welding Ductile Iron . . . . . . . . . . . . . . . . . .. 8.1-6 SECTION 8.2 WELDING CAST STEEL Preparation for Welding 8.2-1 Effects of Welding 8.2-2 The Welding Operation 8.2-2 8.1-1 Welding Cast Iron Types of Cast Iron There are four major types of cast iron - gray cast as the first step in the making of malleable iron, malleable iron, ductile (nodular) iron, and iron, a much more useful material. white (or chilled) iron. Most cast-iron parts are Malleable Iron: This material is a white cast made in gray iron. Gray cast iron, malleable iron iron that has been heat treated by a long annealing and ductile (nodular) iron are difficult to weld but process (usually lasting 2 or 3 days) that changes they can be welded when the proper procedures are the combined carbon (iron carbide or cementite) used. Malleable iron and ductile iron require long into iron and a uniformly distributed temper carbon post heat treatment to restore their normal strength