Study on Effect of Repair Welding Process on Clad Inteface of Austenitic Stainless Steel and Structural Steel

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Elangovan S, Pratheesh kumar S, Narasimmavinay N, Arumuga sastha M

Abstract

Stainless steels are the class of material used for various applications involving corrosive environment where damage to the structure take place through different modes of corrosion. Because of the high cost due to its rich alloying element, it is difficult to use this material in bulk quantity for various structural applications. To solve the above problem metal cladding process is employed to clad a layer of stainless steel with backing structural steel plate. As the surface of stainless steel in the clad will be in contact with the corrosive medium, damage will take place on the surface of the material after being put into any application. Thus, repair welding process will be carried out as a part of maintenance to make the structure suitable for further operation and also for prevention of premature failure. Some work has been by carried out by researchers on the effect of multiple number of repair welding process on cladded stainless steel plate. This work deals with study on effect of Tungsten Inert Gas (TIG) repair welding process on the interface of 316L austenitic stainless steel and IS 2062 structural steel plate cladded by explosive bonding technique. Repair welding is carried out on grooves of 1mm, 1.5mm and 2mm height with various input current values. The welded specimen is evaluated for any debonding at the interface using Ultrasonic Testing and the shear strength of the material is found using shear testing method. Also, the correlation of mechanical property and microstructure is carried out to understand the complete effect of repair welding process on the cladded interface and the threshold factors for repair welding is established.

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