Experimental Investigation on Weld Ability of Cast Iron

Abstract

Abstract:Welding cast iron is used in ships, bridges, pressure vessels, industrial machinery, automobile, rolling stock and many other fields. Problems associated with welding are common issues in these fields. A Study was conducted to investigate Weldability of grey cast iron, as grey cast iron contains graphite in flake form, carbon can readily be introduced into the weld pool, causing weld metal embrittlement and Grey cast iron welds are subject to the formation of porosity and the cold cracking susceptibility of welds. When we observed that gray cast iron is welded non uniform heating and cooling in weld metal and in base metal generates harder Heat Affected Zone (HAZ), cold crack susceptibility and residual stress in weldement. Different methods investigate experimentally to minimize above difficulties. Those methods for reducing the effects of above problems were, minimize base metal dilution, compensate for shrinkage stresses, and the use of low strength filler metals to reduce cracking without sacrificing overall joint strength. Main while the beast type of arc welding electrodes for welding of grey cast iron are nickel and nickel-iron types have been used with or without preheating and / or post weld heat treatment. At the same time Cast iron and steel electrodes must be used with high preheats (530°C) to prevent cracking and the formation of hard deposits. The other mechanisms to improve Weldability of gray cast iron are Pre heating and/or Post heating of the base metal was experimentally employed and investigated.

Welding and Thermal Spray Processes for Maintenance of Hydraulic Turbine Runners: Case Studies

“…The synergy cavitation/corrosion is presented by Mayer et al [39], interpreting the effective influence of the corrosion on the cavitation behavior of the material. However, for the remelted coatings, the same region of the severe cavitation erosion was selected, since the alloys FeMnCrSi in the condition of welded presented resistance close to the welded Co alloys [34,47,48] and had higher corrosion resistance than the substrates [49].…”

“…The FeMnCrSi alloys sprayed were results of R&D project and are under patent [33]. These alloys as-sprayed and as remelted by PTA presented resistance to cavitation very close to alloys with Co [34,47,48], justifying their use.…”

Análisis mecánico y microestructural en soldadura de fundición dúctil, mediante procedimiento TIG, con diferentes materiales de aporte y enfriamiento al aire

“…In this type of ductile cast iron, the carbon is mainly found in the form of spheroidal graphite (Wube Dametew, 2015;Cárcel-Carrasco et al, 2017) 6 %Ni; and (II. According to UNE-EN 1563 (2019) spheroidal graphite cast irons can be classified into two main groups: ferritic-pearlitic cast irons of spheroidal graphite and ferritic cast irons of spheroidal graphite hardened by solid solution.…”

“…These alloys provide a wide range of mechanical properties (Wube Dametew, 2015;Marques et al, 2019), defined by their microstructure and their low levels of defects, which are typical of castings. This is due to the high fluidity conferred by the high carbon content and the low melting point (Abboud, 2012;De La Torre et al, 2014;Wube Dametew, 2015). As a result of these characteristics, nodular cast irons are currently the most widely produced cast alloys in the world (Kumar et al, 2017).…”

“…On the other hand, the ease of control of the TIG process with respect to SMAW welding and the possibility of extending the range of filler materials in TIG regarding GMAW process (Wube Dametew, 2015;Bhatnagar and Gupta, 2016), may justify the convenience of performing the welding of cast iron by means of the TIG process, despite its high energy density.…”