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On Corrosion Resistance Of Austenitic Stainless Steel Clad Layer on a Low Alloy Steel
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316 austenitic steel is used as cladding material widely. Cladding is a surfacing technique that not only provides good corrosion, erosion resistance properties, but also improves mechanical strength of the job surface. Gas metal arc welding is a semi-automatic, user friendly, economic process that is successfully employed for producing clad layer on a component. Quality of cladding depends upon weld bead geometry of clad layer which further depends upon heat input applied. In current experiment, three sets of heat inputs were chosen for single layer 50% overlapped (316) austenitic stainless steel cladding onto E350 low alloy steel by active metal gas welding. Torch travel speed was kept constant during the experiment. Total experiments were replicated twice for establishing better reliability of the result. Accelerated corrosion test was performed to determine the corrosion rate of the clad surface. Metallography test shows microstructure of clad portion that can justify the corrosion rate. Results show that corrosion rate increases with increase in heat input on the whole. Linear regression analysis is applied successfully to evaluate the relation between heat input and corrosion rate.
Keywords
Cladding, MAG, Heat Input, Corrosion Rate, Regression Analysis.
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