The Paton Welding Journal, 2006, №09

2006 №09 (01)

2006 №09 (03)

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The Paton Welding Journal, 2006, #9, 9-16 pages

Main aspects of weldability of structural cast irons

Yu.Ya. Gretsky

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
The role of composition, structure and mechanical properties of cast iron castings are considered from the view point of welding. The main factors are named, which determine considerable difficulties in making the composite readily workable welded joints in welding cast iron products without high preheating or subsequent heat treatment. The influence of the graphite phase and metal base oxidation products on the basic possibility of cast iron to form a welded joint is considered. Conditions of solidification and structure formation in the fusion zone are analyzed. Results of studying the influence of the thermal cycle of arc welding on the structure and properties of cast irons in the HAZ metal are analyzed. The concepts of the nature of near-weld cracks are presented, and the principles of prevention of tears and microcracks in the HAZ metal are set forth. The initial postulates for selection of the composition of the deposited metal and respective electrode consumables, and measures for lowering the susceptibility of nickel-based weld metal to pore formation are presented. A set of requirements to the quality of arc welding of cast iron is determined, and metallurgical and technological measures for ensuring the continuity, tightness, strength and treatability of welded joints are generalized.
Keywords: structural cast iron, chemical composition, structure, mechanical properties, weldability, arc welding, welded joint, fusion zone, HAZ, weld metal, near-weld cracks, porosity, joint quality, welding technology

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Suggested Citation

Yu.Ya. Gretsky (2006) Main aspects of weldability of structural cast irons ... 9. The Paton Welding J., 09, 9-16.

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