On the Underwater Cutting Using a Consumable Electrode Water Jet Technique

Cutting with Constant Voltage Welder

Abstract

The authers have previously described arc phenomena of underwater cutting using a consumable electrode water jet technique in freshwater at a depth of 0.3 m. In this experiment a MG type electric source with a constant voltage characteristic was used, and observing arc phenomena whilst cutting proceed, possibility was seen applying a electric source with an AC constant voltage characteristic. Thus with this electric source, cutting efficiency, polarity effect, arc moving and selection of cutting conditions were studies, and also as a result of cutting of mild steel and aluminum in fresh water at a depth of 60 m, the pressure of jetting water was not critical being 11 kg/cm² and 8 kg/cm² at 60 m deep to mild steel and aluminum respectivity and fast cutting speed with high quality was obtained, even though heightened secondary voltage was applied with increasing of a water depth.