Abstract
A specimen of weld metal was prepared by GTA welding with weld wire of super duplex stainless steel. Aging treatment was conducted for the sample at the temperature range of 700 to <TEX>$900^{\circ}C$</TEX> for 5 to 300 minutes. The effect of aging temperature and time to pitting corrosion of weld metal has been investigated and the results were derived as follows. The volume fraction of <TEX>${\sigma}$</TEX> phase tends to increase with an increase of aging temperature and time. Pitting potential Ep representing pitting corrosion was found to tend to decrease with an increase of aging time at 700 to <TEX>$900^{\circ}C$</TEX>. And most of the pits formed near the <TEX>${\sigma}$</TEX>-phase in the ferrite and seemed to propagated to austenite.
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