Abstract
The effect of multipass welding on microstructural changes and the Charpy toughness values of austenitic weld metal of type 304L was studied. Number of weld passes were varied using different plate thicknesses, keeping heat input per pass constant. The welded plates were heat treated at 600 °C, 800 °C and 1000 °C for 1 h and air cooled. Ferrite variation studies made by Ferritescope across the cross section of weld metals revealed that ferrite content varies due to multipass welding. Microstructural studies revealed extensively different morphologies of ferrite at different locations in the weld metal due to multipass welding. Charpy toughness values decreased with increase in number of passes. 800 °C heat treatment decreased toughness while 1000 °C improved it
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