Sensitization by carbide precipitation has great effect on the anodic polarization curves on AISI stainless steel welds. The sensitization temperature for 304 stainless steel is approximately 425-870℃. If the cooling rate is sufficient high, chromium carbide will not precipitate and the material will be super saturated with free carbon. This research aimed at examining the effect of water quenching on the welds of 304 stainless steel after gas tungsten arc welding (GTAW).In this investigation, the anodic polarization curves and ASTM262 oxalic acid etch test were employed to identify the corrosion resistance on air cooled and water quenched welds. The result showed that the water quenching process significantly improved the capability of corrosion resistance both on 304 and 304L stainless steel welds.