Electrochemical oxygen transfer during direct current are welding

The electrochemical transfer of oxygen was investigated for electrode negat ive and electrode positive polarities in the submerged are, shielded metal are and gas tungsten are welding processes. Analysis of the welds showed th at electrochemical reactions as well as thermochemical reactions are signif icant in altering the oxygen content of the weld metal. The oxygen transfer in the submerged and shielded metal are welding processes is strongly infl uenced by electrochemical reactions at the slag/metal interface, and oxygen transfer in gas tungsten are welding is strongly influenced by electrochem ical reactions at the plasma/metal interface. The electrochemical oxygen re actions at the slag/metal interface include oxygen pickup at the anode and oxygen refining at the cathode. Electrochemical oxygen reactions at the pla sma/metal interface include the refining of oxygen at the anode and pickup at the cathode. Electrochemical reactions have the greatest influence on we ld metal chemistry at high welding currents and at slow weld travel speeds.