フラックス入りワイヤによる水カーテン式水中炭酸ガスアーク溶接(第2報)

Abstract

Authors have proposed an underwater welding pocess called water curtain type underwater CO2 arc welding method. It was already reported that may succeeded in single layer butt welding at 120 cm/min high speed as underwater welding by using flux cored wires in this process. Now, all deposited metal are made and thick plates are welded with multiple pass by using the said wires.The conclusions that may be drawn from this study are:1) Hardness of welds becomes lower under use of mixed shielding gas of O2 with Ar and CO2.2) In tensile tests of all deposited specimens executed by underwater welding, the elongation was 9-13%.3) After heat treatment of these specimens at 350°C for 1 hr, the elongation became 14-24%.4) Welds executed by two layer butt welding of 6mm thick plates and six layer butt welding of 20mm thick plates turned out satifactory in tensile test and bending test.