Repair welding casting defects in nodular cast iron castings

1994 ◽  
Vol 8 (4) ◽  
pp. 326-328
Author(s):  
J Veselko ◽  
J Mesko ◽  
J Pleva ◽  
R Konecna ◽  
J Strapko
Keyword(s):  
Cast Iron ◽  
Nodular Cast Iron ◽  
Casting Defects ◽  
Repair Welding ◽  
Iron Castings

scholarly journals Possibilities of increasing the dimensional accuracy of nodular cast iron castings

2020 ◽  
Vol 1546 ◽  
pp. 012058
Author(s):  
A S Eletskaya ◽  
E A Shibeev ◽  
G S Garibyan ◽  
E N Eremin ◽  
A V Tiyan ◽  
...  
Keyword(s):  
Cast Iron ◽  
Dimensional Accuracy ◽  
Nodular Cast Iron ◽  
Iron Castings

scholarly journals MMA Repair Welding of Nodular Cast Iron GJS 350-22

2018 ◽  
Vol 2018 (3) ◽  
pp. 45-50
Author(s):  
Jacek Górka ◽  
Marcin Żuk
Keyword(s):  
Cast Iron ◽  
Nodular Cast Iron ◽  
Repair Welding

Modelling of the Density Changes of Nodular Cast Iron During Solidification by CA-FD Method

2014 ◽  
Vol 790-791 ◽  
pp. 140-145
Author(s):  
Andriy A. Burbelko ◽  
Daniel Gurgul ◽  
Wojciech Kapturkiewicz ◽  
Edward Guzik
Keyword(s):  
Cast Iron ◽  
Ductile Iron ◽  
Liquidus Temperature ◽  
Nodular Cast Iron ◽  
Solidification Path ◽  
Temperature Phase ◽  
Casting Alloys ◽  
Iron Castings ◽  
Shrinkage Defects ◽  
Three Stages

Formation of the shrinkage defects in ductile iron castings is far more complicated phenomenon than in other casting alloys. In the presented paper changes the ductile iron density during solidification is analyzed. During the solidification path the influence of the temperature, phase fractions and phase composition is taking into account. Computer model, using cellular automata method, for estimation of changes in density of ductile iron during its solidification is applied. Results of the solidification modeling for Fe-C binary alloys with different composition in the castings with a different wall thickness are presented. As a result of calculations it was stated that after undercooling ductile iron below liquidus temperature volumetric changes proceed in three stages: pre-eutectic shrinkage (minimal in eutectic cast iron), eutectic expansion and the last shrinkage.

scholarly journals Effective Modulus Estimation Method of QT400-18 Cast Iron with Repair Welding

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Tao Wei ◽  
Wei Liu ◽  
Wenxuan Gou ◽  
Junqiang Kou
Keyword(s):  
Cast Iron ◽  
Volume Fraction ◽  
Estimation Method ◽  
Welding Process ◽  
Nodular Cast Iron ◽  
Effective Modulus ◽  
Uniaxial Tensile ◽  
Cross Sectional ◽  
Negative Exponential Function ◽  
Repair Welding

Repair welding is an important remediation process for castings with slight defects. In this paper, the tensile behaviors of the QT400-18 nodular cast iron with different repair welding sizes were experimentally analyzed. Specimens with different diameters of the filler region were prepared by the same welding process. The fracture initiated in the filler region under uniaxial tensile loading. The modulus, strength, and ductility decreased with the weld diameter increase. The postyield hardening phenomenon was not observed in the repaired specimen. The repair region ratio was defined as the proportion of the repair welding area to the cross-sectional area of the structure. The effective modulus of the repaired specimens decreased with the repair region ratio increase, and the relationship between them was fitted by a negative exponential function. The repair welding region was treated as an inclusion in the matrix of castings, and the volume fraction of inclusion was applied to characterize the repair welding size. Based on the theories of Eshelby tensor and Mori–Tanaka equivalent method, a method for estimating macroscopic effective modulus of repair welding castings was established. The theoretical solutions were in good agreement with the experimental results. The method will be helpful in estimating the safe service limit of repair welded castings.

scholarly journals Effect of Annealing on Nature of Corrosion Damages of Medium-nickel Austenitic Cast Iron

2017 ◽  
Vol 17 (3) ◽  
pp. 85-90 ◽  
Author(s):  
D. Medyński ◽  
A. Janus ◽  
J. Chęcmanowski
Keyword(s):  
Corrosion Resistance ◽  
Cast Iron ◽  
Martensite Transformation ◽  
Structural Changes ◽  
Nodular Cast Iron ◽  
Matrix Structure ◽  
Iron Castings ◽  
Equilibrium Structures ◽  
Austenitic Cast Iron ◽  
Corrosion Pits

Abstract Within the presented research, effect of annealing on nature of corrosion damages of medium-nickel austenitic nodular cast iron castings, containing 5.5% to 10.3% Ni, was determined. Concentration of nickel, lower than in the Ni-Resist cast iron, was compensated with additions of other austenite-stabilising elements (manganese and copper). In consequence, raw castings with austenitic matrix structure and gravimetrically measured corrosion resistance increasing along with nickel equivalent value EquNi were obtained. Annealing of raw castings, aimed at obtaining nearly equilibrium structures, led to partial austenite-to-martensite transformation in the alloys with EquNi value of ca. 16%. However, corrosion resistance of the annealed alloys did not decrease in comparison to raw castings. Annealing of castings with EquNi value above 18% did not cause any structural changes, but resulted in higher corrosion resistance demonstrated by smaller depth of corrosion pits.

scholarly journals Management of the activity of quality assurance of cast iron castings in foundries

2021 ◽  
Vol 1781 (1) ◽  
pp. 012050
Author(s):  
A Josan ◽  
E Ardelean ◽  
M Ardelean ◽  
V Puţan
Keyword(s):  
Quality Assurance ◽  
Cast Iron ◽  
Iron Castings
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