Abstract
Nickel alloys had gathered wide acceptance in the fabrication of light weight structures which require high temperature resistance and corrosion resistance, such as metallic bellows used in expansion joints used in aircraft, aerospace and petroleum industry, in which they are subjected to high temperature and corrosive environment. The effects of pulsing current parameters on weld pool geometry namely front width, back width, front height and back height of pulsed current micro plasma arc welded Nickel alloy (Inconel 625) were analysed. Four factors, five levels, central composite design was used to develop mathematical models, incorporating pulsed current parameters and weld pool geometry. The mathematical models have been developed by Response Surface Method. The adequacy of the models was checked by ANOVA technique. By using the developed mathematical models, weld pool geometry parameters can be predicted.

Key words
pulsed current, micro plasma arc welding, Inconel625, ANOVA

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